Halogen-free flame-retardant foamed composite board and preparation method thereof

Abstract

This invention provides a halogen-free flame-retardant foamed composite board and its preparation method. The halogen-free flame-retardant foamed composite board includes a top layer, an intermediate layer, and a bottom layer stacked together. The three-layer sandwich structure is configured, and the composition of the materials in each layer is defined. Specifically, a specific amount of foaming agent is added to the material of the intermediate layer, and the melt index of the first polycarbonate is defined as 6–21 cm⁻¹. 3 / 10min, the melt index of the second polycarbonate is 5-9cm. 3 The process involves adding flame retardants and anti-aging agents to all three layers of material, resulting in a halogen-free flame-retardant foamed composite board that combines high tensile strength, low density, and excellent flame retardant properties. Furthermore, the low bromine and chlorine content contributes to its environmentally friendly characteristics.

Description

Technical Field

[0001] This invention belongs to the field of flame-retardant board technology, specifically relating to a halogen-free flame-retardant foamed composite board and its preparation method. Background Technology

[0002] Polycarbonate (PC) is one of the five most widely used engineering plastics. It has comprehensive and balanced mechanical, electrical and heat resistance properties, and is particularly known for its excellent impact strength and creep resistance. It also has high light transmittance and good mechanical properties. In particular, its impact toughness is the best among engineering plastics. Due to the excellent properties of PC, its products and blends have been widely used in the electronics, electrical appliances, machinery, automotive, textile, light industry and construction industries.

[0003] Polycarbonate also possesses a certain degree of self-extinguishing property, releasing CO2 when burning. Its flame-retardant properties are superior to those of general plastics. However, in some applications with high flame-retardant requirements, further flame-retardant modification is necessary. Currently, the commonly used technique in flame-retardant modification is the addition of flame retardants. The main flame retardants added to polycarbonate are halogenated flame retardants, such as tetrabromobisphenol A, hexabromobenzene, red phosphorus, and phosphate esters. Due to their low flame-retardant efficiency, these conventional flame retardants are generally used in large quantities to meet certain flame-retardant requirements. This inevitably deteriorates the original excellent mechanical properties, electrical properties, and thermal stability of polycarbonate and other polymer substrates, increasing the amount of smoke or toxic gases generated during polymer combustion or pyrolysis.

[0004] Besides conventional flame retardants, highly effective flame retardants for polycarbonate include organic aromatic sulfonates, such as aromatic sulfonic acids, aromatic ketone sulfonic acids, aromatic sulfur sulfonic acids, and aromatic ester sulfonic acids, as well as alkali metal or alkaline earth metal salts of sulfone sulfonic acids with electron-withdrawing groups. These flame retardants, especially alkali metal or alkaline earth metal salts of sulfone sulfonic acids with electron-withdrawing groups, are superior in that they require small amounts and have high flame retardant efficiency, overcoming some of the shortcomings of conventional polycarbonate flame retardants. However, they also have the problem of easily reaching saturation in polycarbonate and failing to improve the flame retardant rating of the material. On the other hand, most conventional phosphorus-based flame retardants require large amounts, which greatly affects the physical and mechanical properties of polycarbonate materials, severely limiting the application of polycarbonate products in some electronic and electrical fields.

[0005] Therefore, developing a halogen-free flame-retardant foamed composite board with excellent flame retardant properties, high tensile strength, and low density remains a pressing technical problem in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a halogen-free flame-retardant foamed composite board and its preparation method. The halogen-free flame-retardant foamed composite board has advantages such as high tensile strength, excellent flame-retardant performance, and low density, and also has good environmental protection characteristics.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] In a first aspect, the present invention provides a halogen-free flame-retardant foamed composite board, the halogen-free flame-retardant foamed composite board comprising a surface layer, an intermediate layer and a bottom layer stacked together;

[0009] The surface and bottom layers each consist of the following components in parts by weight:

[0010] 100 to 1000 parts by weight of the first polycarbonate;

[0011] 1-55 parts by weight of the first flame retardant;

[0012] 1-10 parts by weight of the first anti-aging agent;

[0013] 1-10 parts by weight of the second anti-aging agent;

[0014] The material of the intermediate layer comprises the following components in parts by weight:

[0015] 100 to 1000 parts by weight of the second polycarbonate;

[0016] 1-55 parts by weight of the second flame retardant;

[0017] 1-30 parts by weight of foaming agent;

[0018] The third anti-aging agent is 1-10 parts by weight;

[0019] Fourth anti-aging agent: 1-10 parts by weight;

[0020] Furthermore, the melt index of the first polycarbonate is 6–21 cm⁻¹. 3 / 10min (e.g., 6cm) 3 / 10min, 8cm 3 / 10min, 10cm 3 / 10min, 12cm 3 / 10min, 14cm 3 / 10min, 16cm 3 / 10min, 18cm 3 / 10min, 20cm 3 / 10min or 21cm 3 / 10min, etc.), the melt index of the second polycarbonate is 5-9cm. 3 / 10min (e.g., 5cm) 3 / 10min, 6cm 3 / 10min, 7cm 3 / 10min, 8cm 3 / 10min or 9cm3 / 10min, etc.), preferably 9cm 3 / 10min; the above melt flow index was tested at a temperature of 190℃ and a load of 2.16kg, according to ASTM D1238.

[0021] The amount of the first polycarbonate added can be 200 parts by weight, 300 parts by weight, 400 parts by weight, 500 parts by weight, 600 parts by weight, 700 parts by weight, 800 parts by weight, or 900 parts by weight.

[0022] The amount of the first flame retardant added can be 3 parts by weight, 6 parts by weight, 9 parts by weight, 12 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 33 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, or 55 parts by weight, etc.

[0023] The amount of the first anti-aging agent added can be 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, etc.

[0024] The amount of the second anti-aging agent can be 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, etc.

[0025] The amount of the second polycarbonate added can be 200 parts by weight, 300 parts by weight, 400 parts by weight, 500 parts by weight, 600 parts by weight, 700 parts by weight, 800 parts by weight, or 900 parts by weight, etc.

[0026] The amount of the second flame retardant added can be 3 parts by weight, 6 parts by weight, 9 parts by weight, 12 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, 29 parts by weight, 33 parts by weight, 35 parts by weight, 40 parts by weight, 45 parts by weight, 50 parts by weight, or 55 parts by weight, etc.

[0027] The amount of foaming agent added can be 3 parts by weight, 6 parts by weight, 9 parts by weight, 12 parts by weight, 15 parts by weight, 17 parts by weight, 19 parts by weight, 23 parts by weight, 25 parts by weight, 27 parts by weight, or 29 parts by weight, etc.

[0028] The amount of the third anti-aging agent can be 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, etc.

[0029] The amount of the fourth anti-aging agent can be 2 parts by weight, 4 parts by weight, 6 parts by weight, 8 parts by weight, or 10 parts by weight, etc.

[0030] The halogen-free flame-retardant foamed composite board provided by this invention comprises a top layer, an intermediate layer, and a bottom layer stacked together. The materials of the top layer and the bottom layer each independently include specific proportions of a first polycarbonate, a first flame retardant, a first anti-aging agent, and a second anti-aging agent. The material of the intermediate layer includes specific proportions of a second polycarbonate, a second flame retardant, a foaming agent, a third anti-aging agent, and a fourth anti-aging agent. Through the above three-layer sandwich structure, and by defining the composition of the materials in each layer, particularly by adding specific proportions of a foaming agent to the material of the intermediate layer, and defining the melt index of the first polycarbonate as 6–21 cm⁻¹, this invention achieves the desired effect. 3 / 10min, the melt index of the second polycarbonate is 5-9cm. 3 The process involves adding flame retardants and anti-aging agents to all three layers of material, resulting in a halogen-free flame-retardant foamed composite board with a sandwich structure that combines high tensile strength, low density, and excellent flame retardant properties. At the same time, the content of bromine and chlorine is low, making it environmentally friendly.

[0031] Preferably, the total thickness of the halogen-free flame-retardant foamed composite board is 15 to 6000 μm, such as 50 μm, 100 μm, 500 μm, 1000 μm, 2000 μm or 4000 μm.

[0032] Preferably, the thickness of the surface layer is 5 to 2000 μm, such as 10 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, 1300 μm, 1600 μm or 1900 μm.

[0033] Preferably, the thickness of the intermediate layer is 5 to 2000 μm, such as 10 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, 1300 μm, 1600 μm or 1900 μm.

[0034] Preferably, the thickness of the bottom layer is 5 to 2000 μm, such as 10 μm, 50 μm, 100 μm, 200 μm, 400 μm, 600 μm, 800 μm, 1000 μm, 1300 μm, 1600 μm or 1900 μm.

[0035] Preferably, the melt flow index of the first polycarbonate and the second polycarbonate is independently 3 to 17 cm⁻¹. 3 / 10min, more preferably 3-12cm 3 / 10min.

[0036] Preferably, the first polycarbonate and the second polycarbonate comprise any one or a combination of at least two of the following: CLARNATE FL5105, LEXANTM 101-111, LEXANTM IR2210-NA9E157T, LEANTM 103-111, LEXANTM 103R-111, LEXANTM 141R-111, LEXANTM 143R-111, LEXANTM 121R-111, LEXANTM 123R-111, or LEXANTM IR1810-NA9E157T from SABIC and Wanhua Chemical Group Co., Ltd.

[0037] Preferably, the content of the first flame retardant in the surface and bottom layers is 1 to 30 parts by weight, more preferably 1 to 5 parts by weight, ensuring that the obtained halogen-free flame-retardant foamed composite board has excellent flame-retardant properties while ensuring that the amount of chlorine and bromine contained is low.

[0038] Preferably, the content of the second flame retardant in the material of the intermediate layer is 1 to 30 parts by weight, more preferably 1 to 5 parts by weight, ensuring that the obtained halogen-free flame-retardant foamed composite board has excellent flame-retardant properties while ensuring that the content of chlorine and bromine is low.

[0039] As a preferred embodiment of the present invention, further limiting the content of flame retardants in the surface layer, intermediate layer and bottom layer can result in a composite board with excellent flame retardancy, low chlorine content and low bromine content.

[0040] Preferably, both the first flame retardant and the second flame retardant are ionic liquid flame retardants.

[0041] Preferably, the ionic liquid flame retardant includes any one or a combination of at least two of AR-S11, DR-S15, BR-S13, CR-M5575, CR-M5102 or ER-M3288 produced by Novogene New Materials (Hangzhou) Co., Ltd.

[0042] Preferably, the foaming agent comprises Foamazol manufactured by Bergen International, USA. TM 80. Foamazol TM 81. Foamazol TM 81. Foamazol TM 86. Foamazol TM 87. Foamazol TM 88. Foamazol TM 89. Foamazol TM 810, Foamazol TM811, Foamazol TM 812, Foamazol TM 814, Foamazol TM 816, Foamazol TM 1001 or Foamazol TM Any one or at least two of 1002.

[0043] Preferably, the first, second, third, and fourth anti-aging agents each independently comprise hindered phenolic, hindered amine, or nitrite anti-aging agents, used to prevent the polymer material from losing strength and toughness due to oxidative degradation, including but not limited to Irganox B225, Irganox 1076, Irganox MD 1024, Irganox 1010, Irganox 245, Irganox 500, Irganox 245(ED), Irganox 245-DW, Irganox 1035, Irganox 1076, Irganox 1135, Irganox 1425, Irgafos 126(ED), Irganox 168, Irganox PS 802, Irganox B 225(ED), Irganox B 900, or Tinuvin from Bergen International and BASF. Any one or at least two of 249.

[0044] Preferably, both the surface layer and the bottom layer materials further include 1 to 10 parts by weight (e.g., 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, or 9 parts by weight, etc.) of release agent.

[0045] Preferably, the material of the intermediate layer further includes 1 to 10 parts by weight (e.g., 2 parts by weight, 3 parts by weight, 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, or 9 parts by weight, etc.) of a release agent.

[0046] Preferably, the release agent comprises any one or a combination of at least two of Glycolube p, PAA 3512, PAA 2511, PAA 3520, PAA 3520N, PAA 3524, PAA3511, PAA3524N, PAA920A, or PAA3532 supplied by Shanghai Chengyu Industrial Co., Ltd. and Guangzhou Entropy Energy Innovation Materials Co., Ltd.

[0047] In a second aspect, the present invention provides a method for preparing a halogen-free flame-retardant foamed composite board as described in the first aspect, the method comprising the following steps:

[0048] (1) A first polycarbonate, a first flame retardant, a first anti-aging agent, a second anti-aging agent and optionally a release agent are mixed to obtain a surface material;

[0049] The second polycarbonate, the second flame retardant, the third anti-aging agent, the fourth anti-aging agent, and optionally the release agent are mixed to obtain the intermediate layer material;

[0050] The first polycarbonate, the first flame retardant, the first anti-aging agent, the second anti-aging agent, and optionally the release agent are mixed to obtain the base material;

[0051] (2) Add the surface material, intermediate layer material and bottom layer material obtained in step (1) to the extruder, and add a foaming agent to the intermediate layer material to perform three-layer co-extrusion to obtain the halogen-free flame-retardant foamed composite board.

[0052] The method for preparing halogen-free flame-retardant foamed composite boards provided by this invention adopts co-extrusion molding, which is highly efficient, energy-saving, easy to process, uses simple equipment, and is easy to operate. It is of great significance for further expanding the application of halogen-free flame-retardant foamed composite boards.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] (1) The halogen-free flame-retardant foamed composite board provided by the present invention comprises a top layer, a middle layer and a bottom layer stacked together. Through the above-mentioned three-layer sandwich structure, and by limiting the composition of materials in each layer, especially by adding a specific amount of foaming agent to the material of the middle layer, and selecting a melt index of 3 to 23 cm⁻¹ 3 Using polycarbonate as the main resin and adding flame retardants to all three layers of the material, the resulting halogen-free flame-retardant foamed composite board has high tensile strength, low density and excellent flame retardant properties, while the content of bromine and chlorine is low, which makes it environmentally friendly.

[0055] (2) Specifically, the density of the intermediate layer of the halogen-free flame-retardant foamed composite board provided by the present invention is only 0.3 to 1.1 g / cm³. 3 It has a tensile strength of up to 60-69 MPa, a bromine content of only 472-6810 ppm, a chlorine content of only 594-6667 ppm, and a UL94 rating of ≥V0. Attached Figure Description

[0056] Figure 1 A cross-sectional structural diagram of the halogen-free flame-retardant foamed composite board provided by the present invention;

[0057] Figure 2 A cross-sectional scanning electron microscope image of the halogen-free flame-retardant foamed composite board provided in Example 1;

[0058] Among them, 1-top layer, 2-middle layer, 3-bottom layer. Detailed Implementation

[0059] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0060] Unless otherwise specified, the experimental materials used in the specific embodiments of this invention are as follows: polycarbonate purchased from SBIC, flame retardant purchased from Novogene New Materials (Hangzhou) Co., Ltd., foaming agent purchased from Bergen International, anti-aging agent purchased from Bergen International or BASF, and release agent purchased from Shanghai Chengyu Industrial Co., Ltd. or Guangzhou Entropy Energy Innovation Materials Co., Ltd.; the multilayer co-extrusion production line equipment is the BREYER OptiFlex Extrusion line provided by BREYER GmbH Maschinenfabrik, Germany.

[0061] The equipment used for producing co-extruded films includes: an extruder with a screw of 60 mm in diameter (D) and a length of 33 D; a melt pump; a crosshead; a flat die with a width of 450 mm; a three-roll calender with a horizontal roll arrangement, the third roll being rotated approximately 45° relative to the horizontal position; a roller conveyor; a thickness gauge; a device for applying protective film to both sides; a take-out device; and a winding machine.

[0062] Example 1

[0063] A cross-sectional structural diagram of a halogen-free flame-retardant foamed composite board is shown below. Figure 1 As shown, it includes a top layer 1, a middle layer 2, and a bottom layer 3 that are stacked together;

[0064] The thickness of both the top layer 1 and the bottom layer 3 is 5 μm, and the materials comprise the following components by weight: first polycarbonate (LEXANTM 101-111, melt index 6 cm⁻¹). 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (AR-S11), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010), and 1 part by weight of the first release agent (PAA 3524);

[0065] The thickness of intermediate layer 2 is 5 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3100 parts by weight of (10min) secondary flame retardant (AR-S11) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3524) 1 part by weight, and foaming agent (Foamazol) TM 80) 1 part by weight;

[0066] The preparation method of the halogen-free flame-retardant foamed composite board includes the following steps:

[0067] (1) The first polycarbonate, the first flame retardant, the first anti-aging agent, the second anti-aging agent and the first release agent are mixed evenly and then extruded and granulated by a twin-screw extruder to obtain the surface material and the bottom material, which are ready for use.

[0068] The second polycarbonate, the second flame retardant, the third anti-aging agent, the fourth anti-aging agent, and the second release agent are mixed evenly and then extruded and granulated using a twin-screw extruder to obtain the intermediate layer material, which is ready for use.

[0069] The temperature settings of the twin-screw extruder are as follows: the temperatures of each section from zone 1 to zone 9 are 250±5℃, 270±5℃, 280±5℃, 280±5℃, 280±5℃, 285±5℃, 280±5℃, and 280±5℃, respectively; the die temperature is 270~285℃; the main screw speed is 750r / min; and the extruded strip undergoes water cooling, dehumidification, and pelletizing processes.

[0070] (2) The surface material, intermediate layer material and bottom layer material obtained in step (1) are co-extruded by a co-extrusion three-roll calender. At the same time, a foaming agent is added to the intermediate layer material and cooled to obtain the halogen-free flame-retardant foamed composite board.

[0071] The three-layer co-extrusion process is as follows: the raw material is placed in the extrusion device, heated and melted, and then extruded through the T-die in the extrusion device. The extrusion temperatures of the first, second, and third layers are controlled at 270±2℃, 275±2℃, and 270±2℃, respectively, and the layer thicknesses are controlled at 5μm, 5μm, and 5μm, respectively. After molding in the molding device, the molding temperature is controlled at 138±2℃.

[0072] Example 2

[0073] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0074] The thickness of both the top layer 1 and the bottom layer 3 is 50 μm, and the materials each include the following components by weight: first polycarbonate (LEXANTM IR2210-NA9E157T, melt index 9 cm⁻¹). 3100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (DR-S15), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (Glycolube p);

[0075] The thickness of intermediate layer 2 is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (Glycolubep) and foaming agent (Foamazol) TM 81) 1 part by weight;

[0076] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0077] Example 3

[0078] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0079] The thickness of both the top and bottom layers is 100 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM IR2210-NA9E157T, melt index 9 cm⁻¹). 3 100 parts by weight of (10min), 1 part by weight of the first flame retardant (DR-S15), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3524);

[0080] The thickness of the intermediate layer is 100 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3524) 1 part by weight and foaming agent (Foamazol) TM 85) 1 part by weight;

[0081] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0082] Example 4

[0083] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0084] The thickness of both the top and bottom layers is 200 μm, and the materials, by weight, include the following components: first polycarbonate (LEANTM_103-111, melt index 6 cm⁻¹). 3 100 parts by weight of (10min), 1 part by weight of the first flame retardant (CR-M5575), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3520);

[0085] The thickness of the intermediate layer is 200 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5575) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3520) 1 part by weight and foaming agent (Foamazol) TM 86) 1 part by weight;

[0086] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0087] Example 5

[0088] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0089] The thickness of both the top and bottom layers is 500 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 103R-111L, melt index 6 cm⁻¹). 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (ER-M3288), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (Glycolube p);

[0090] The thickness of the intermediate layer is 500 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3100 parts by weight of (10min) secondary flame retardant (ER-M3288) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (Glycolubep) and foaming agent (Foamazol) TM 87) 1 part by weight;

[0091] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0092] Example 6

[0093] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0094] The thickness of both the top and bottom layers is 1000 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 141R-111), with a melt flow index of 6 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (ER-M3288), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3512);

[0095] The thickness of the intermediate layer is 1000 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3512) 1 part by weight, and foaming agent (Foamazol) TM 88) 1 part by weight;

[0096] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0097] Example 7

[0098] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0099] The thickness of both the top and bottom layers is 2000 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 143R-111), with a melt flow index of 12 cm⁻¹. 3100 parts by weight of ( / 10min) First flame retardant (AR-S11) 1 part by weight First anti-aging agent (Tinuvin 249) 1 part by weight Second anti-aging agent (Irganox 1010) 1 part by weight and First release agent (PAA3512) 1 part by weight;

[0100] The thickness of the intermediate layer is 2000 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5102) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3520) 1 part by weight, and foaming agent (Foamazol) TM 89) 1 part by weight;

[0101] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0102] Example 8

[0103] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0104] The thickness of both the top and bottom layers is 5 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 121R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (BR-S13), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3512);

[0105] The thickness of the intermediate layer is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (BR-S13) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3512) 1 part by weight, and foaming agent (Foamazol) TM 810) 1 part by weight;

[0106] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0107] Example 9

[0108] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0109] The thickness of both the top and bottom layers is 5 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 123R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of (10min), 1 part by weight of the first flame retardant (CR-M5575), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3520);

[0110] The thickness of the intermediate layer is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3520) 1 part by weight, and foaming agent (Foamazol) TM 811) 1 part by weight;

[0111] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0112] Example 10

[0113] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0114] The thickness of both the top and bottom layers is 5 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 121R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (CR-M5575), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3524);

[0115] The thickness of the intermediate layer is 2000 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3524) 1 part by weight and foaming agent (Foamazol) TM 812) 1 part by weight;

[0116] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0117] Example 11

[0118] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0119] The thickness of both the top and bottom layers is 2000 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 101-111), with a melt flow index of 6 cm⁻¹. 3 100 parts by weight of (10min), 1 part by weight of the first flame retardant (CR-M5575), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3524);

[0120] The thickness of the intermediate layer is 5 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5102) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3524) 1 part by weight, and foaming agent (Foamazol) TM 814) 1 part by weight;

[0121] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0122] Example 12

[0123] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0124] The thickness of both the top and bottom layers is 500 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM IR1810-NA9E157T), with a melt flow index of 21 cm⁻¹. 3100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (BR-S13), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010), and 1 part by weight of the first release agent (Glycolube p);

[0125] The thickness of the intermediate layer is 150 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5575) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (Glycolubep) and foaming agent (Foamazol) TM 816) 1 part by weight;

[0126] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0127] Example 13

[0128] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0129] The thickness of the top layer and the bottom layer are both 250 μm and 150 μm, respectively. The materials, by weight, each include the following components: first polycarbonate (LEXANTM 103R-111L), with a melt flow index of 6 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (CR-M5102), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (Glycolube p);

[0130] The thickness of the intermediate layer is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5575) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (Glycolubep) and foaming agent (Foamazol) TM 1001) 1 part by weight;

[0131] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0132] Example 14

[0133] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0134] The thicknesses of the top and bottom layers are 250 μm and 150 μm, respectively. The materials, by weight, comprise the following components: a first polycarbonate (LEXANTM 141R-111) with a melt flow index of 12 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (CR-M5102), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (Glycolube p);

[0135] The thickness of the intermediate layer is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (CR-M5102) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (Glycolubep) and foaming agent (Foamazol) TM 1002) 1 part by weight;

[0136] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0137] Example 15

[0138] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0139] The thickness of both the top and bottom layers is 80 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 121R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (CR-M5102), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3524);

[0140] The thickness of the intermediate layer is 80 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹).3 100 parts by weight of (10min) secondary flame retardant (CR-M5102) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3512) 1 part by weight, and foaming agent (Foamazol) TM 81) 1 part by weight;

[0141] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0142] Example 16

[0143] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0144] The thickness of both the top and bottom layers is 250 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 121R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of ( / 10min) First flame retardant (AR-S11) 1 part by weight First anti-aging agent (Tinuvin 249) 1 part by weight Second anti-aging agent (Irganox 1010) 1 part by weight and First release agent (PAA3512) 1 part by weight;

[0145] The thickness of the intermediate layer is 80 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (AR-S11) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3520N) and foaming agent (Foamazol) TM 81) 1 part by weight;

[0146] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0147] Example 17

[0148] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0149] The thickness of both the top and bottom layers is 150 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM IR1810-NA9E157T), with a melt flow index of 21 cm⁻¹. 3100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (DR-S15), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3520N);

[0150] The thickness of the intermediate layer is 50 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (DR-S15) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA3520N) 1 part by weight, and foaming agent (Foamazol) TM 81) 1 part by weight;

[0151] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0152] Example 18

[0153] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0154] The thickness of both the top and bottom layers is 250 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 103R-111L), with a melt flow index of 6 cm⁻¹. 3 100 parts by weight of ( / 10min), 1 part by weight of the first flame retardant (BR-S13), 1 part by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010) and 1 part by weight of the first release agent (PAA3520N);

[0155] The thickness of the intermediate layer is 250 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of (10min) secondary flame retardant (BR-S13) 1 part by weight, 1 part by weight of tertiary anti-aging agent (Tinuvin 249) 1 part by weight, 1 part by weight of quaternary anti-aging agent (Irganox 1010) 1 part by weight, 1 part by weight of secondary release agent (PAA 3512) 1 part by weight and foaming agent (Foamazol) TM 81) 1 part by weight;

[0156] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0157] Example 19

[0158] A halogen-free flame-retardant foamed composite board, which has the same structure as in Example 1, includes a layered surface layer, a middle layer and a bottom layer.

[0159] The thickness of both the top and bottom layers is 1500 μm, and the materials, by weight, include the following components: first polycarbonate (LEXANTM 121R-111), with a melt flow index of 21 cm⁻¹. 3 100 parts by weight of the first flame retardant (CR-M5575), 15 parts by weight of the first anti-aging agent (Tinuvin 249), 1 part by weight of the second anti-aging agent (Irganox 1010), and 1 part by weight of the first release agent (PAA 3512).

[0160] The thickness of the intermediate layer is 1500 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of the following ingredients: 15 parts by weight of the second flame retardant (Tinuvin 326), 1 part by weight of the third anti-aging agent (CR-M5575), 1 part by weight of the fourth anti-aging agent (Irganox 1010), 1 part by weight of the second release agent (PAA3512), and 1 part by weight of the foaming agent (Foamazol). TM 81) 5 parts by weight;

[0161] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0162] Example 20

[0163] A halogen-free flame-retardant foamed composite board, the structure of which is the same as that shown in Example 1, includes a surface layer, an intermediate layer and a bottom layer stacked together;

[0164] The thickness of both the top layer 1 and the bottom layer 3 is 5 μm, and the materials comprise the following components by weight: first polycarbonate (LEXANTM 101-111, melt index 6 cm⁻¹). 3 600 parts by weight of (10min) First flame retardant (AR-S11) 30 parts by weight, First anti-aging agent (Tinuvin 249) 5 parts by weight, Second anti-aging agent (Irganox 1010) 5 parts by weight and First release agent (PAA3524) 5 parts by weight;

[0165] The thickness of the intermediate layer is 5 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3600 parts by weight of the following ingredients: 600 parts by weight of the second flame retardant (AR-S11), 30 parts by weight of the third anti-aging agent (Tinuvin 249), 5 parts by weight of the fourth anti-aging agent (Irganox 1010), 5 parts by weight of the second release agent (PAA3524), and 5 parts by weight of the foaming agent (Foamazol). TM 80) 10 parts by weight;

[0166] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0167] Example 21

[0168] A halogen-free flame-retardant foamed composite board, the structure of which is the same as that shown in Example 1, includes a surface layer, an intermediate layer and a bottom layer stacked together;

[0169] The thickness of both the top layer 1 and the bottom layer 3 is 5 μm, and the materials comprise the following components by weight: first polycarbonate (LEXANTM 101-111, melt index 6 cm⁻¹). 3 100 parts by weight of the first flame retardant (AR-S11), 25 parts by weight of the first anti-aging agent (Tinuvin 249), 10 parts by weight of the second anti-aging agent (Irganox 1010), and 10 parts by weight of the first release agent (PAA3524).

[0170] The thickness of the intermediate layer is 5 μm, and the material comprises the following components by weight: second polycarbonate (CLARNATEFL5105, melt index 9 cm⁻¹). 3 100 parts by weight of the following ingredients: 1 / 10 min) flame retardant (AR-S11) 25 parts by weight, 10 parts by weight of the third anti-aging agent (Tinuvin 249) 10 parts by weight, 5 parts by weight of the fourth anti-aging agent (Irganox 1010) 5 parts by weight, 10 parts by weight of the second release agent (PAA3524) 10 parts by weight, and foaming agent (Foamazol). TM 80) 30 parts by weight;

[0171] The preparation method of the halogen-free flame-retardant foamed composite board provided in this embodiment is the same as that in Embodiment 1.

[0172] Comparative Example 1

[0173] A halogen-free flame-retardant foamed composite board, which differs from Example 1 in that it uses a melt flow index of 22cm⁻¹. 3 Replace the first polycarbonate (LEXANTM 101-111, melt index 6 cm⁻¹) with polycarbonate (LEXANTM IR1810) for 10 min. 3 ( / 10min), the other structures, components and preparation methods are the same as in Example 1.

[0174] Comparative Example 2

[0175] A halogen-free flame-retardant foamed composite board, which differs from Example 1 in that it uses a melt flow index of 5cm⁻¹. 3 Replace the first polycarbonate (LEXANT M101-111, melt index 6 cm⁻¹) with polycarbonate (Makrolon 3258, from Covestro Polymers Ltd.) for 10 min. 3 ( / 10min), the other structures, components and preparation methods are the same as in Example 1.

[0176] Comparative Example 3

[0177] A halogen-free flame-retardant foamed composite board, which differs from Example 1 in that it uses a melt flow index of 10 cm⁻¹. 3 Replace the second polycarbonate (CLARNATE FL5105, melt index 9cm) with polycarbonate (Makrolon 6557, from Covestro Polymers Ltd.) for 10 min. 3 ( / 10min), the other structures, components and preparation methods are the same as in Example 1.

[0178] Comparative Example 4

[0179] A halogen-free flame-retardant foamed composite board, which differs from Example 1 in that it uses a melt flow index of 3cm⁻¹. 3 Replace the second polycarbonate (CLARNATEFL5105, melt index 9cm⁻¹) with polycarbonate (Makrolon 6717, from Covestro Polymers Ltd.) for 10 min. 3 ( / 10min), the other structures, components and preparation methods are the same as in Example 1.

[0180] Comparative Example 5

[0181] A halogen-free flame-retardant foamed composite board, which differs from Example 1 in that no foaming agent (Foamazol) is added to the raw materials of the middle layer. TM 80), the other structures, components and preparation methods are the same as in Example 1.

[0182] Comparative Example 6

[0183] A halogen-free flame-retardant foamed composite board differs from Example 1 in that no flame retardant (AR-S11), first anti-aging agent, second anti-aging agent, third anti-aging agent, and fourth anti-aging agent are added to the materials of the surface layer, middle layer, and bottom layer. The reduced proportion of flame retardant and anti-aging agent is increased in other components to ensure that the total amount and the proportion of other components remain unchanged. The structure and preparation method are the same as those of Example 1.

[0184] Comparative Example 7

[0185] A halogen-free flame-retardant foam board differs from Example 1 in that it does not have a top and bottom layer, but consists only of an intermediate layer with a thickness of 15 μm.

[0186] Comparative Example 8

[0187] A halogen-free flame-retardant foamed board differs from Example 1 in that the amount of foaming agent added to the raw material of the intermediate layer is 0.5 parts by weight, while the other structures, components and preparation methods are the same as in Example 1.

[0188] Comparative Example 9

[0189] A halogen-free flame-retardant foamed board differs from Example 1 in that the amount of foaming agent added to the raw material of the intermediate layer is 65 parts by weight, while the other structures, components and preparation methods are the same as in Example 1.

[0190] Comparative Example 10

[0191] A halogen-free flame-retardant foamed composite board differs from Example 1 in that it uses halogenated flame retardant FG-8500 (Teijin) to replace flame retardant AR-S11 as the first and second flame retardants. The other structures, components and preparation methods are the same as in Example 1.

[0192] Performance testing:

[0193] (1) Foaming structure: The halogen-free flame-retardant foamed composite board provided in Example 1 was tested using a scanning electron microscope (Hitachi S-4800, Japan). The scanning electron microscope image of the halogen-free flame-retardant foamed composite board provided in Example 1 is shown below. Figure 2 As shown;

[0194] from Figure 2 It can be seen that the halogen-free flame-retardant foamed composite board obtained in Example 1 has a sandwich structure, wherein the middle layer is composed of a foam structure with a cell diameter ranging from tens to 100 μm, the largest cell diameter being about 100 μm and the smallest being about 10 μm.

[0195] (2) Bromine and chlorine content: tested using an energy dispersive X-ray fluorescence spectrometer (Suzhou Sanzhi Precision Instruments Co., Ltd., EDX6000E);

[0196] (3) Tensile strength: The test was conducted using a microelectronically controlled electronic universal testing machine (Shenzhen WanCe Testing Equipment Co., Ltd., 104BH);

[0197] (4) Density: Tested using an electronic density meter (Dongguan Hongtuo Instrument Co., Ltd., DH-300).

[0198] (5) Flame retardancy test: The UL94 standard for flammability testing of plastic materials is adopted;

[0199] The boards provided in Examples 1-21 and Comparative Examples 1-10 were tested according to the above test method, and the test results are shown in Table 1:

[0200] Table 1

[0201]

[0202] As can be seen from the data in Table 1, the halogen-free flame-retardant foamed composite boards provided in Examples 1 to 21 have low density, high tensile strength, and excellent environmental and flame-retardant properties.

[0203] Specifically, the density of the interlayer of the halogen-free flame-retardant foamed composite boards provided in Examples 1-21 is only 0.3-1.1 g / cm³. 3 It has a tensile strength of up to 60-69 MPa, a bromine content of only 472-6810 ppm, a chlorine content of only 594-6667 ppm, and a UL94 rating of ≥V0.

[0204] Compared with Example 1, the polycarbonate used in the surface and bottom layers of the halogen-free flame-retardant foamed composite panels provided in Comparative Examples 1 and 2 has a melt index that is not within the specified range, resulting in lower tensile strength.

[0205] Compared with Example 1, the polycarbonate used in the middle layer of the halogen-free flame-retardant foamed composite panels provided in Comparative Examples 3-4 has a melt index that is not within the specified range, which also results in lower tensile strength.

[0206] Compared with Example 1, the intermediate layer of the halogen-free flame-retardant foamed composite board provided in Comparative Example 5 did not contain a foaming agent, resulting in a higher density of the intermediate layer and thus a heavier overall composite board.

[0207] Compared with Example 1, no flame retardant and anti-aging agent were added to the surface, middle and bottom layers of the halogen-free flame-retardant foamed composite board provided in Comparative Example 6, resulting in a UL94 rating of 5VA and poor flame retardancy.

[0208] Compared to Example 1, Comparative Example 7 could not be molded because it did not have a surface layer and a bottom layer;

[0209] Compared with Example 1, the amount of foaming agent added in the intermediate layer of the halogen-free flame-retardant foamed composite board provided in Comparative Example 8 is lower, resulting in a higher density of the intermediate layer and a heavier composite board.

[0210] Compared with Example 1, the amount of foaming agent added to the intermediate layer of the halogen-free flame-retardant foamed composite board provided in Comparative Example 9 was higher, which also resulted in the inability to form the board.

[0211] Compared with Example 1, the replacement of flame retardant AR-S11 with halogenated flame retardant FG-8500 (Teijin) in the halogen-free flame retardant foamed composite board provided in Comparative Example 10 also resulted in excessively high bromine and chlorine contents, at 11821 and 10931 ppm, respectively.

[0212] The applicant declares that this invention illustrates a halogen-free flame-retardant foamed composite board and its preparation method through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A halogen-free flame-retardant foamed composite board, characterized in that, The halogen-free flame-retardant foamed composite board comprises a surface layer, a middle layer, and a bottom layer stacked together. The surface and bottom layers each consist of the following components in parts by weight: The material of the intermediate layer comprises the following components in parts by weight: The first polycarbonate has a melt index of 6-21 g / 10 min at 190 °C and 2.16 kg load according to ASTM D1238, and the second polycarbonate has a melt index of 5-9 g / 10 min at 190 °C and 2.16 kg load according to ASTM D1238. Both the first flame retardant and the second flame retardant are ionic liquid flame retardants; The ionic liquid flame retardant includes any one or a combination of at least two of AR-S11, DR-S15, BR-S13, CR-M5575, CR-M5102 or ER-M3288 produced by Novogene New Materials Hangzhou Co., Ltd.

2. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The total thickness of the halogen-free flame-retardant foamed composite board is 15–6000 μm.

3. The halogen-free flame-retardant foamed composite board according to claim 1 or 2, characterized in that, The thickness of the surface layer is 5–2000 μm.

4. The halogen-free flame-retardant foamed composite board according to claim 1 or 2, characterized in that, The thickness of the intermediate layer is 5–2000 μm.

5. The halogen-free flame-retardant foamed composite board according to claim 1 or 2, characterized in that, The thickness of the bottom layer is 5–2000 μm.

6. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The content of the first flame retardant in the surface and bottom materials is 1 to 30 parts by weight.

7. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The content of the second flame retardant in the material of the intermediate layer is 1 to 30 parts by weight.

8. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The foaming agent includes any one or a combination of at least two of the following: sulfonyl hydrazine foaming agents, azodicarbonamide foaming agents, aminourea foaming agents, or tetrazolium foaming agents.

9. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The surface and bottom layers each contain 1 to 10 parts by weight of release agent.

10. The halogen-free flame-retardant foamed composite board according to claim 1, characterized in that, The material of the intermediate layer also includes 1 to 10 parts by weight of release agent.

11. A method for preparing a halogen-free flame-retardant foamed composite board as described in any one of claims 1 to 10, characterized in that, The preparation method includes the following steps: (1) A first polycarbonate, a first flame retardant, a first anti-aging agent, a second anti-aging agent and optionally a release agent are mixed to obtain a surface material; The second polycarbonate, the second flame retardant, the third anti-aging agent, the fourth anti-aging agent, and optionally the release agent are mixed to obtain the intermediate layer material; The first polycarbonate, the first flame retardant, the first anti-aging agent, the second anti-aging agent, and optionally the release agent are mixed to obtain the base material; (2) Add the surface material, intermediate layer material and bottom layer material obtained in step (1) to the extruder, and add a foaming agent to the intermediate layer material to perform three-layer co-extrusion to obtain the halogen-free flame-retardant foamed composite board.

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