A flame-retardant polyester fiber composite material and preparation method thereof

Abstract

The invention discloses a polyester fiber flame retardant composite material and a preparation method thereof, wherein waste textile fibers are used as raw materials, polyester fiber felt is prepared by physical processing, and then the polyester fiber felt is surface treated with a formaldehyde-dicyandiamide modifier to obtain a modified polyester fiber felt, and then the polyester fiber flame retardant composite material is obtained by hot pressing with a flame retardant soybean oil-based resin. The polyester fiber flame retardant composite material prepared by the invention has excellent mechanical properties, thermal stability and flame retardant properties, and can be used as a reinforcing material for paper honeycombs, providing an environmentally friendly recycling method for the recycling of waste textile fibers.

Description

Technical Field

[0001] The invention belongs to the field of fiber-reinforced composite materials, and specifically relates to a polyester fiber flame-retardant composite material and a preparation method and application thereof. Background Art

[0002] Waste textiles are clothing and home textile products discarded after daily consumption. As the world's largest textile country, my country produces 35 million tons of waste textiles every year, but the current utilization rate is less than 20%. Most of them are treated by incineration, landfill and other methods, causing great pollution to the environment. Due to technical and cost limitations, how to efficiently utilize waste textiles has always been a difficult problem. At present, the recycling methods of waste textiles at home and abroad mainly include chemical and physical methods. Chemical methods have the disadvantages of high processing energy consumption, great difficulty in recycling, and unstable product performance. Physical recycling methods usually refer to recycling technologies that repeatedly process waste textiles through a physical processing process of crushing-netting-needling. In contrast, physical recycling methods have the advantages of low processing costs and investment savings.

[0003] At the same time, formaldehyde-based adhesives with petroleum resources as the main raw materials are widely used in the fields of composite materials, coatings, and artificial boards, but formaldehyde-based adhesives have the problem of releasing free formaldehyde, which seriously endangers human health. At the same time, this type of adhesive uses non-renewable petroleum-based chemicals as the main raw material, and its large-scale use is not in line with my country's dual-carbon strategic goals. Vegetable oil is an oil obtained from the fruits, seeds, and germs of plants. The molecular structure of vegetable oil is composed of a glycerol center connecting three fatty acid chains, which is easy to form a three-dimensional cross-linked network structure. The research and development of bio-based formaldehyde-free adhesives using biomass resources as raw materials is a key way to achieve green manufacturing of products, which is in line with the strategic needs of the development of the country's basic strategic new materials and bioresource industries.

[0004] In addition, polyester fiber has excellent characteristics such as high temperature resistance, fatigue resistance and friction resistance; but its mechanical properties are poor and it is flammable, so it needs to be further modified or compounded with flame-retardant resin to expand its application in many fields. The present invention first uses waste textile fibers as raw materials to prepare polyester fiber felt by physical processing; secondly, formaldehyde, triethanolamine and dicyandiamide are used to prepare formaldehyde-dicyandiamide modifier, and the polyester fiber felt is surface modified to prepare modified polyester fiber felt; then, the modified polyester fiber felt and flame-retardant soybean oil-based resin are used to prepare polyester fiber flame-retardant composite materials by hot pressing; finally, the polyester fiber flame-retardant composite material is used as the skin board of the paper honeycomb to prepare a flame-retardant reinforced board. The present invention provides a method for efficient recycling and reuse of solid waste, and at the same time broadens the application field of plant oil-based resins, which is of great significance to reducing the use of petroleum-based products and developing a low-carbon economy. Summary of the invention

[0005] In view of the problems that a large amount of existing waste textiles are difficult to recycle and cause environmental pollution after being discarded, the present invention provides a polyester fiber flame retardant composite material using waste textiles as raw materials and a preparation method and application thereof. The obtained polyester fiber flame retardant composite material has excellent mechanical properties, thermal stability and flame retardant properties.

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

[0007] A polyester fiber flame retardant composite material, the preparation method of which comprises the following steps:

[0008] (1) Using waste textiles as raw materials, polyester fiber felt is produced through physical processing;

[0009] (2) impregnating the polyester fiber felt obtained in step (1) in a formaldehyde-dicyandiamide modifier, and obtaining a modified polyester fiber felt by thermal curing;

[0010] (3) gluing two sheets of modified polyester fiber felt obtained in step (2) with a flame-retardant soybean oil-based resin, and hot-pressing to obtain the polyester fiber flame-retardant composite material.

[0011] Furthermore, the physical processing in step (1) includes the steps of shredding, detangling, loosening, laying, and needle punching.

[0012] Furthermore, the polyester fiber felt obtained in step (1) has a gram weight of 200 g / m 2 .

[0013] Furthermore, the ratio of the formaldehyde-dicyandiamide modifier to the polyester fiber felt used in step (2) is 286 g / m 2 .

[0014] Furthermore, the preparation of the formaldehyde-dicyandiamide modifier in step (2) is as follows: 20 parts of polyformaldehyde and 200 parts of water are mixed, heated to melt at 120°C for 30 minutes, and then 5 parts of triethanolamine are added and stirred for 10 minutes to obtain a transparent clear solution; then 15 parts of dicyandiamide, 7 parts of phosphoric acid and 200 parts of water are added and stirred for 30 minutes, and then cooled to room temperature to obtain the obtained solution.

[0015] Furthermore, the thermal curing temperature in step (2) is 100° C. and the time is 30 min.

[0016] Furthermore, the sizing amount of the flame retardant soybean oil-based resin in step (3) is 2500 g / m 2 .

[0017] Furthermore, the flame retardant soybean oil-based resin in step (3) is prepared by mixing 7 parts of tannic acid and 10 parts of hydroxyethyl acrylate for 10 minutes, then adding 15 parts of epoxy soybean oil and 7 parts of 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate, and continuing to mix and stir for 20 minutes. After cooling to room temperature, 1 part of tert-butyl perbenzoate is added, and the mixture is stirred evenly at room temperature and then allowed to stand for defoaming to obtain the flame retardant soybean oil-based resin.

[0018] Furthermore, the hot pressing molding temperature in step (3) is 140° C., the pressure is 6 MPa, and the hot pressing time is 5 h.

[0019] The polyester fiber flame retardant composite material can be used as a reinforcing material to prepare a reinforced plate, which is specifically prepared by a hot pressing molding process using the polyester fiber flame retardant composite material as a skin and a paper honeycomb as a core material and using a polyurethane adhesive.

[0020] Furthermore, the preparation method is to evenly apply polyurethane adhesive on the surface of the paper honeycomb, then stick the polyester fiber flame retardant composite material to the upper and lower surfaces of the paper honeycomb board, press at 100°C and 1 MPa for 20 minutes, and cool to room temperature to obtain the reinforced board.

[0021] The beneficial effects of the present invention are:

[0022] The invention uses waste textile fibers as raw materials, prepares polyester fiber felt by physical processing, then performs surface finishing on the polyester fiber felt with a formaldehyde-dicyandiamide modifier to prepare a modified polyester fiber felt, and then composites the modified polyester fiber felt and a flame-retardant soybean oil-based resin through hot pressing to prepare a polyester fiber flame-retardant composite material. The prepared polyester fiber flame-retardant composite material has excellent mechanical properties, thermal stability and flame-retardant properties, and provides an environmentally friendly recycling method for the recycling of waste textiles. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of a reinforcement plate prepared using a polyester fiber flame retardant composite material according to the present invention.

[0024] Figure 2 This is a comparison of the surface morphologies of the polyester fiber felt before and after modification in Example 1.

[0025] Figure 3 The contact angle comparison diagrams of soybean oil-based resin (a) and flame retardant soybean oil-based (b) on the polyester fiber felt before and after modification in Example 1 are shown.

[0026] Figure 4 It is a comparison chart of the limiting oxygen index of the polyester fiber felt and the polyester fiber composite material prepared in the embodiment and the comparative example.

[0027] Figure 5 These are TGA curves of polyester fiber felt and polyester fiber composite materials prepared in Examples and Comparative Examples.

[0028] Figure 6 Combustion performance test of paper honeycomb (a) and reinforced paper honeycomb (b) prepared in application example. DETAILED DESCRIPTION

[0029] A polyester fiber flame retardant composite material, the preparation method of which comprises the following steps:

[0030] (1) Using waste textiles as raw materials, polyester fiber felt is made through physical processing steps such as shredding, de-buckling, opening, laying, and needle punching, with a gram weight of 200 g / m 2 ;

[0031] (2) 286 g / m 2 The polyester fiber felt obtained in step (1) is immersed in a formaldehyde-dicyandiamide modifier, and thermally cured at 100° C. for 30 min to obtain a modified polyester fiber felt;

[0032] (3) Two sheets of modified polyester fiber felt prepared in step (2) are glued together with a flame retardant soybean oil-based resin at a glue amount of 2500 g / m 2 The polyester fiber flame retardant composite material was obtained by hot pressing for 5 h at 140° C. and 6 MPa.

[0033] The preparation of the formaldehyde-dicyandiamide modifier is as follows: 20 parts of polyformaldehyde and 200 parts of water are mixed and heated to melt at 120°C for 30 minutes, and then 5 parts of triethanolamine are added and stirred for 10 minutes to obtain a transparent clear solution; then 15 parts of dicyandiamide, 7 parts of phosphoric acid and 200 parts of water are added and stirred for 30 minutes, and then cooled to room temperature to obtain the product.

[0034] The flame retardant soybean oil-based resin is prepared by mixing 7 parts of tannic acid and 10 parts of hydroxyethyl acrylate for 10 minutes, then adding 15 parts of epoxy soybean oil and 7 parts of 2-methyl-2-acrylic acid-2-hydroxyethyl phosphate, and continuing to mix and stir for 20 minutes. After cooling to room temperature, 1 part of tert-butyl peroxybenzoate is added, and the mixture is stirred evenly at room temperature and then allowed to stand for defoaming to obtain the flame retardant soybean oil-based resin.

[0035] like Figure 1 A reinforced board prepared using the polyester fiber flame retardant composite material, which uses a paper honeycomb as a core material, evenly applies a polyurethane adhesive on the surface of the paper honeycomb, and then adheres the polyester fiber flame retardant composite material as a skin to the upper and lower surfaces of the paper honeycomb board, presses at 100°C and a pressure of 1 MPa for 20 min, and cools to room temperature to obtain the reinforced board.

[0036] In order to make the contents of the present invention easier to understand, the technical solution of the present invention is further described below in conjunction with specific implementation methods, but the present invention is not limited thereto.

[0037] Raw materials: paraformaldehyde (99%), triethanolamine (98%), dicyandiamide (99%), phosphoric acid (98%), epoxidized soybean oil (ESO, average epoxy group 4.1, acid value ≤0.6 mg KOH / g), tannic acid (TA, AR), hydroxyethyl acrylate (HEA, 99%), 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate (HEMAP, 99%) and tert-butyl peroxybenzoate (TBPB, 98%) were purchased from Shanghai MacLean Biochemical Technology Co., Ltd. Polyester fiber felt (made from industrial waste fiber scraps through shredding, de-buttoning, opening, laying, needle punching and other technologies) was purchased from Costin New Materials Group Co., Ltd. Epoxidized soybean oil acrylate (AESO, average molecular weight: 1200 g / mol; viscosity (25°C): 18000-32000 mPa·s; acid value: ≤10 mg KOH / g; inhibitor: 3500-4500 ppm hydroquinone monomethyl ether) was purchased from Jiangsu Litian Technology Co., Ltd. Paper honeycomb was purchased from Wuxi Chengde Honeycomb Machinery Factory. Polyurethane adhesive was purchased from Shanghai Youxing Shark Technology Co., Ltd.

[0038] Example 1 Preparation of modified polyester fiber felt (mPET)

[0039] Preparation process of formaldehyde-dicyandiamide modifier: by weight, 20 parts of polyformaldehyde and 200 parts of water are mixed and heated at 120°C for 30 minutes to dissolve, and then 5 parts of triethanolamine are added and stirred for 10 minutes to obtain a transparent clear solution; then 15 parts of dicyandiamide, 7 parts of phosphoric acid and 200 parts of water are added and stirred for 30 minutes, and the mixture is cooled to room temperature.

[0040] Preparation process of modified polyester fiber: 286 g / m 2 The polyester fiber felt is immersed in the formaldehyde-dicyandiamide modifier, taken out after 2 minutes, and rolled with a cylindrical hard plastic rod; after the polyester fiber felt (PET) is surface-treated by two immersions and two rollings, the excess modifier is squeezed out (the rolling residue rate is controlled to be 70-90%), and the impregnated and modified polyester fiber felt is heat-cured in an oven at 100°C for 30 minutes to obtain mPET.

[0041] Example 2 Preparation of polyester fiber flame retardant composite material (mPET / EHPT)

[0042] Preparation process of flame retardant soybean oil-based resin: by weight, 7 parts of tannic acid and 10 parts of hydroxyethyl acrylate are mixed and stirred for 10 minutes, and then 15 parts of epoxy soybean oil and 7 parts of 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate are added to the above solution and mixed and stirred for 20 minutes. After cooling to room temperature, 1 part of tert-butyl perbenzoate is added, and the mixture is stirred evenly at room temperature and then allowed to stand for defoaming to obtain EHPT resin.

[0043] Preparation process of polyester fiber flame retardant composite material: The flame retardant soybean oil-based resin is evenly coated between two sheets of modified polyester fiber felt prepared in Example 1, and the sizing amount is 2500 g / m 2 , hot pressing at 140°C and 6 MPa for 1 h, and then cooling to room temperature to obtain mPET / EHPT.

[0044] Comparative Example 1 Preparation of polyester fiber composite material (PET / AESO)

[0045] Preparation process of soybean oil-based resin: According to parts by weight, 100 parts of epoxy soybean oil acrylate and 2 parts of tert-butyl perbenzoate are mixed and stirred evenly, and allowed to stand for defoaming to obtain soybean oil-based resin.

[0046] Preparation process of polyester fiber composite material: soybean oil-based resin is evenly coated between two polyester fiber felts, and the amount of sizing is 2500 g / m 2 , hot-press at 140°C and 6 MPa for 1 h, and then cool to room temperature to obtain PET / AESO.

[0047] Comparative Example 2 Preparation of polyester fiber composite material (mPET / AESO)

[0048] Preparation process of soybean oil-based resin: According to parts by weight, 100 parts of epoxy soybean oil acrylate and 2 parts of tert-butyl perbenzoate are mixed and stirred evenly, and allowed to stand for defoaming to obtain soybean oil-based resin.

[0049] Preparation process of polyester fiber composite material: soybean oil resin is evenly coated between two sheets of modified polyester fiber felt prepared in Example 1, and the sizing amount is 2500 g / m 2 , hot pressing at 140°C and 6 MPa for 5 h, and then cooling to room temperature to obtain mPET / AESO.

[0050] Comparative Example 3 Preparation of polyester fiber composite material (PET / EHPT)

[0051] Preparation process of flame retardant soybean oil-based resin: by weight, 7 parts of tannic acid and 10 parts of hydroxyethyl acrylate are mixed and stirred for 10 minutes, and then 15 parts of epoxy soybean oil and 7 parts of 2-methyl-2-acrylic acid-2-hydroxyethyl ester phosphate are added to the above solution and mixed and stirred for 20 minutes. After cooling to room temperature, 1 part of tert-butyl perbenzoate is added, and the mixture is stirred evenly at room temperature and then allowed to stand for defoaming to obtain EHPT resin.

[0052] Preparation process of polyester fiber composite material: Flame-retardant soybean oil-based resin is evenly coated between two polyester fiber felts, with a sizing amount of 2500 g / m 2 , hot pressing at 140°C and 6 MPa for 5 h, and then cooling to room temperature to obtain PET / EHPT.

[0053] Application Example Paper honeycomb board reinforced with polyester fiber flame retardant composite material

[0054] The preparation process of the paper honeycomb board reinforced with polyester fiber flame retardant composite material is as follows: the polyurethane adhesive is evenly applied on the surface of the paper honeycomb, and then the polyester fiber composite material is glued to the upper and lower surfaces of the paper honeycomb board, and hot-pressed at 100°C and 1 MPa for 20 minutes, and then cooled to room temperature.

[0055] 1. Surface morphology test of polyester fiber before and after modification:

[0056] The surface morphology of the polyester fiber felt before and after modification was characterized by a MIRA LMS scanning electron microscope (TESCAN, Czech Republic). The sample surface was gold-sprayed, the acceleration voltage was 5 kV, and the magnification was 200 times. Figure 2 .

[0057] Depend on Figure 2 It can be seen that the surface of PET is smooth, while the surface of mPET has an obvious coating layer, indicating that the fiber modification is successful.

[0058] 2. Contact angle test:

[0059] The contact angle test between soybean oil resin and polyester fiber felt was carried out on a JY-82B contact angle meter (Dude, Shanghai). The specific measurement method was as follows: the polyester fiber felt before and after modification was pre-pressed into a flat sheet, the sheet was fixed on a glass slide and placed in the test area; 3 μ L of soybean oil-based resin was dropped on the surface of the fiber sheet, and a high-speed camera was used to record the digital image of the test process and analyze the contact angle between the soybean oil resin and the fiber sheet. Figure 3 .

[0060] Depend on Figure 3It can be seen that the contact angles of soybean oil-based resin with PET and mPET are 87.9° and 44.1°, respectively, and the contact angles of flame-retardant soybean oil-based resin with PET and mPET are 60.0° and 57.1°, respectively, indicating that the interfacial compatibility between the modified polyester fiber felt and the resin is significantly improved.

[0061] 3. Limiting oxygen index test of polyester fiber composite materials:

[0062] The limiting oxygen index test of polyester fiber composites was carried out according to ASTM D 2863-97 and was measured on a FTT0077 limiting oxygen index instrument (UK). The sample size was 100×12.5×3 mm 3 The results are shown in Figure 4 .

[0063] Depend on Figure 4 It can be seen that the limiting oxygen index (LOI) of PET is 21.34%, and the LOI of mPET is 24.49%, indicating that the minimum oxygen consumption of the modified mPET is significantly improved. The LOI value of the composite material mPET / EHPT is 28.68%, which is significantly higher than the composite materials PET / AESO (20.45%), PET / EHPT (24.30%) and mPET / AESO (22.45%), indicating that the composite material mPET / EHPT requires higher oxygen when burning, which makes it have better flame retardant properties.

[0064] 4. Thermal stability test of polyester fiber composite materials:

[0065] The thermal stability test of polyester fiber composites was characterized by using a German Netzsch TG 209 F3 thermogravimetric analyzer. The test process was as follows: about 20 mg of sample was placed in a sample cell, N2 was introduced for protection, and the temperature was raised from 30°C to 800°C at a heating rate of 10°C / min. The results are shown in Figure 5 .

[0066] Depend on Figure 5 It can be seen that compared with the mass residual rate of PET felt (14.03%), the mass residual rate of the modified mPET felt (21.71%) is significantly increased, indicating that the formaldehyde-dicyandiamide modifier increases the carbon residual amount of polyester fiber at high temperature. Compared with the composite materials PET / AESO and mPET / AESO (2.59% and 6.38%), the residual mass of the composite materials PET / EHPT and mPET / EHPT at 600°C increased significantly to 26.67% and 26.71%, indicating that the addition of EHPT resin increases the carbon content of the composite materials.

[0067] 5. Physical and mechanical properties test of polyester fiber composite materials:

[0068] The tensile properties of polyester fiber flame retardant composites were tested in accordance with ISO 527-2010 standard on a universal testing machine (Instron 3365, USA). The test conditions were: room temperature, loading rate of 10 mm / min; the specimens were dumbbell-shaped specimens (width: 4 mm, span: 25 mm), and each set of specimens was tested 5 times. The bending performance test was carried out at room temperature, loading rate of 10 mm / min, and specimen size of 80×10×3 mm 3 Each group of samples was tested 5 times. The results are shown in Table 1.

[0069] Table 1 Physical and mechanical properties of polyester fiber composites

[0070]

[0071] Table 1 shows that the mechanical properties of the composite material prepared with the modified polyester fiber felt are significantly improved, and because the EHPT resin has a rigid benzene ring structure, the mechanical properties of the composite material prepared with it are significantly higher than those of the composite material prepared with the commercial AESO resin.

[0072] 6. Cone calorimetry test of polyester fiber composites:

[0073] The cone calorimetry test of polyester fiber flame retardant composites was carried out on a FTT0242 cone calorimeter (UK) according to ASTM E1354 standard, with a heat flux intensity of 35 kW / m 2 , the sample size is 100×100×3 mm 3 The results are shown in Table 2.

[0074] Table 2 Cone calorimetry analysis of polyester fiber composites

[0075]

[0076] As can be seen from Table 2, the peak heat release rate and total heat release rate of the composite material mPET / EHPT are 508 kW / m 2 and 45 MJ / m 2 , compared with the composite material mPET / AESO (690 kW / m 2 and 72.8 MJ / m 2 ) was significantly reduced; and compared with the composite material mPET / AESO (0.43 m 3 / s and 53.9 m 3 ) compared with the peak smoke release rate and total smoke production (0.19 m 3 / s and 21.4 m 3 ) decreased significantly. This shows that the flame retardant properties of the composite material mPET / EHPT are significantly improved.

[0077] 7. Physical and mechanical properties test of paper honeycomb board:

[0078] The flat compressive strength and elastic modulus of the paper honeycomb board were tested on a universal testing machine (Instron 3365, USA) according to GB / T 1453-2005 standard. The test was carried out at room temperature with a loading rate of 10 mm / min and a sample size of 50×50×6 mm. 3 Each group of samples was tested 6 times. The flexural strength and modulus of paper honeycomb panels were tested on a universal testing machine (Instron 3365, USA) according to GB / T 17657-2013. The test was carried out at room temperature with a loading rate of 10 mm / min and a sample size of 150×50×8 mm. 3 Each group of samples was tested 6 times. The results are shown in Table 3.

[0079] Table 3 Physical and mechanical properties of paper honeycomb panels reinforced with polyester fiber flame retardant composites

[0080]

[0081] As shown in Table 3, the flexural strength and modulus of the reinforced paper honeycomb board are 1.65 MPa and 303.7 MPa, which are 60% higher than those of paper honeycomb (1.04 and 114.6 MPa), indicating that polyester fiber flame retardant composite materials are beneficial to improving the flexural properties of honeycomb paperboard.

[0082] 8. Combustion grade test of paper honeycomb board

[0083] The combustion grade of paper honeycomb board is tested according to GB / T 8626-2007 "Test Method for Flammability of Building Materials", and the material is rated according to GB 8624-2012 "Classification of Combustion Performance of Building Materials and Products". The test is carried out at room temperature, and the sample size is 150×50×8 mm 3 The results are shown in Figure 6 .

[0084] Depend on Figure 6 It can be seen that in the combustion test, the surface of the paper honeycomb board burned rapidly after being exposed to flames and heat, and the flame quickly spread and destroyed the paper honeycomb board until it was completely destroyed, which is a B3-level flammable flat-plate building material. However, the paper honeycomb board reinforced with mPET / EHPT did not show continuous burning on the surface of the burning area after the flame acted for 60 seconds, and a dense carbon layer appeared on the surface of the board, which is a B1-level flame-retardant flat-plate building material, proving that the polyester fiber flame-retardant composite material improves the flame retardant properties of the honeycomb paperboard.

[0085] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A method for preparing a polyester fiber flame retardant composite material used as a skin, characterized in that: The following steps are involved: (1) Using waste textiles as raw materials, polyester fiber felt is produced through physical processing; (2) impregnating the polyester fiber felt obtained in step (1) in a formaldehyde-dicyandiamide modifier, and obtaining a modified polyester fiber felt by thermal curing; (3) gluing two sheets of modified polyester fiber felt obtained in step (2) with a flame-retardant soybean oil-based resin, and hot-pressing to obtain the polyester fiber flame-retardant composite material; The formaldehyde-dicyandiamide modifier is prepared by mixing 20 parts of polyformaldehyde and 200 parts of water, heating and melting at 120° C. for 30 minutes, adding 5 parts of triethanolamine and stirring for 10 minutes to obtain a transparent clear solution; then adding 15 parts of dicyandiamide, 7 parts of phosphoric acid and 200 parts of water, stirring for 30 minutes, and cooling to room temperature. The flame retardant soybean oil-based resin is prepared by mixing 7 parts of tannic acid and 10 parts of hydroxyethyl acrylate for 10 minutes, then adding 15 parts of epoxy soybean oil and 7 parts of 2-methyl-2-acrylic acid-2-hydroxyethyl phosphate, and continuing to mix and stir for 20 minutes. After cooling to room temperature, 1 part of tert-butyl peroxybenzoate is added, and the mixture is stirred evenly at room temperature and then allowed to stand for defoaming to obtain the flame retardant soybean oil-based resin.

2. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The physical processing in step (1) includes the steps of shredding, detangling, loosening, laying out, and needle punching.

3. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The polyester fiber felt obtained in step (1) has a gram weight of 200 g / m 2 .

4. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The ratio of formaldehyde-dicyandiamide modifier to polyester fiber felt used in step (2) is 286 g / m 2 .

5. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The thermal curing temperature in step (2) is 100° C. and the time is 30 min.

6. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The amount of the flame retardant soybean oil-based resin applied in step (3) is 2500 g / m 2 .

7. The method for preparing the polyester fiber flame retardant composite material according to claim 1, characterized in that: The hot pressing molding temperature in step (3) is 140°C, the pressure is 6 MPa, and the hot pressing time is 5 h.

8. A polyester fiber flame retardant composite material used as a skin prepared by any method as claimed in any one of claims 1 to 7.

9. A reinforced plate prepared by using the polyester fiber flame retardant composite material according to claim 8 as a reinforcing material, characterized in that: The polyester fiber flame retardant composite material is used as the skin, the paper honeycomb is used as the core material, and polyurethane adhesive is used to manufacture the reinforcement plate through a hot pressing molding process.

10. A method for preparing a reinforcing plate according to claim 9, characterized in that: The polyurethane adhesive was evenly applied on the surface of the paper honeycomb, and then the polyester fiber flame retardant composite material was adhered to the upper and lower surfaces of the paper honeycomb board, and pressed at 100° C. and a pressure of 1 MPa for 20 min, and cooled to room temperature to obtain the reinforced board.

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