Polymer modified epoxy resin flexibilizer as well as preparation method and application thereof

Abstract

The invention discloses a polymer modified epoxy resin flexibilizer as well as a preparation method and application thereof, and belongs to the technical field of flexibilizers. The toughening agent is prepared from the following components in parts by weight: 80-150 parts of a modified polyurethane aqueous solution, 10-25 parts of a polystyrene / polyamide mixture, 50-80 parts of amino-terminated liquid nitrile rubber, 15-25 parts of an emulsifier, 5-10 parts of a nano silicon dioxide / nano zirconium dioxide mixture, 10-20 parts of phenolphthalein polyaryletherketone, 20-30 parts of a formic acid / acetic acid mixed solution and 20-40 parts of water. According to the toughening agent, the impact toughness and tensile strength of a toughened epoxy resin system are improved, the crosslinking density and brittleness of epoxy resin are reduced, the impact resistance of the resin can be improved, and the epoxy resin system with high strength, high toughness and high heat resistance is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of toughening agents, and in particular to a polymer modified epoxy resin toughening agent, and a preparation method and application thereof. Background Art

[0002] Epoxy resin is a general term for polymers containing more than two epoxy groups in the molecule. It is a kind of high molecular polymer. It is widely used in various fields, such as construction, electrical appliances, aerospace, machinery, etc., because it has excellent adhesion, bonding strength, electrical insulation, heat resistance and corrosion resistance, and mechanical properties. Epoxy resin needs to meet different performance requirements because it needs to be applied in different fields. How to improve the impact toughness of epoxy resin, it is necessary to toughen and modify epoxy resin to achieve the purpose of improving the mechanical properties of epoxy resin. Although the existing toughening agent can also reduce brittleness, rigidity, strength, and heat deformation temperature are greatly reduced, which cannot meet the structural bonding requirements. However, when epoxy resin is toughened, it often has a greater impact on other properties of epoxy resin, so improving the compatibility between toughening agent and epoxy resin, and further improving the impact toughness and tensile strength of epoxy resin system become research directions. Therefore, the present invention proposes a polymer modified epoxy resin toughening agent, and its preparation method and application, to solve the defects and shortcomings of the prior art. Summary of the invention

[0003] In view of the above-mentioned problems, the present invention proposes a polymer-modified epoxy resin toughening agent, a preparation method and application thereof, so as to improve the compatibility between the toughening agent and the epoxy resin, and further improve the impact toughness and tensile strength of the epoxy resin system.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A polymer modified epoxy resin toughening agent, the toughening agent is made of the following raw materials in parts by weight:

[0006] 80-150 parts of modified polyurethane aqueous solution, 10-25 parts of polystyrene / polyamide mixture, 50-80 parts of amino-terminated liquid nitrile rubber, 15-25 parts of emulsifier, 5-10 parts of nano silicon dioxide / nano zirconium dioxide mixture, 10-20 parts of phenolphthalein type polyaryletherketone, 20-30 parts of formic acid / acetic acid mixture, and 20-40 parts of water.

[0007] Preferably, the toughening agent is made of the following raw materials in parts by weight:

[0008] 95-130 parts of modified polyurethane aqueous solution, 15-20 parts of polystyrene / polyamide mixture, 60-70 parts of amino-terminated liquid nitrile rubber, 17-21 parts of emulsifier, 6-8 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 12-17 parts of phenolphthalein type polyaryletherketone, 22-27 parts of formic acid / acetic acid mixture, and 25-30 parts of water.

[0009] Preferably, the toughening agent is made of the following raw materials in parts by weight:

[0010] 115 parts of modified polyurethane aqueous solution, 18 parts of polystyrene / polyamide mixture, 65 parts of amino-terminated liquid nitrile rubber, 18 parts of emulsifier, 7 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 15 parts of phenolphthalein type polyaryletherketone, 25 parts of formic acid / acetic acid mixture, and 30 parts of water.

[0011] Preferably, the polystyrene / polyamide mixture is composed of polystyrene and polyamide in a mass ratio of 1:3.

[0012] Preferably, the nano-silicon dioxide / nano-zirconium dioxide mixture is composed of a mass ratio of nano-silicon dioxide to nano-zirconium dioxide of (5-10):1.

[0013] Preferably, the formic acid / acetic acid mixture is mixed in a volume ratio of 3:1.

[0014] Preferably, the preparation method of the polymer modified epoxy resin toughening agent specifically comprises the following steps:

[0015] (1) mixing amino-terminated liquid nitrile rubber, modified polyurethane aqueous solution and phenolphthalein type polyaryletherketone at 65-75° C., heating to 95-105° C., adding to an emulsifier, and mixing and stirring in a high-speed stirrer at 1000-1300 rpm under the protection of inert gas nitrogen;

[0016] (2) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 5-10 minutes, and add the formic acid / acetic acid mixture to mix well;

[0017] (3) Finally, all the water is added, mixed evenly, and reacted at 145-150° C. for 20-35 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0018] Preferably, the toughening agent is used in toughening epoxy resin.

[0019] Preferably, the amount of the toughening agent used is 6.5-11.5% of the mass of the epoxy resin.

[0020] Preferably, the amount of the toughening agent used is 9.2% of the mass of the epoxy resin.

[0021] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: the toughening agent of the present invention improves the impact toughness and tensile strength of the toughened epoxy resin system; the modified polyurethane added improves the epoxy resin network structure, and can also reduce the crosslinking density and brittleness of the epoxy resin, and can improve the impact resistance of the resin; the addition of the polystyrene / polyamide mixture can prevent the fracture toughness of the epoxy resin; the nano-silicon dioxide / nano-zirconium dioxide mixture can improve the elongation at break of the system, thereby obtaining a high-strength, high-toughness, and high-heat-resistant epoxy resin system. DETAILED DESCRIPTION

[0022] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] The preparation method of the polymer modified epoxy resin toughening agent of this embodiment 1 specifically comprises the following steps:

[0025] (1) Weigh the following raw materials in parts by weight for later use;

[0026] 115 parts of modified polyurethane aqueous solution, 18 parts of polystyrene / polyamide mixture, 65 parts of amino-terminated liquid nitrile rubber, 18 parts of emulsifier, 7 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 15 parts of phenolphthalein type polyaryletherketone, 25 parts of formic acid / acetic acid mixture, and 30 parts of water;

[0027] The polystyrene / polyamide mixture is composed of a polystyrene and polyamide mixture in a mass ratio of 1:3.

[0028] The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of nano-silicon dioxide and nano-zirconium dioxide in a mass ratio of 7:1.

[0029] The formic acid / acetic acid mixture is composed of formic acid and acetic acid in a volume ratio of 3:1.

[0030] (2) mixing the amino-terminated liquid nitrile rubber, the modified polyurethane aqueous solution, and the phenolphthalein type polyaryletherketone at 70° C., heating to 100° C., adding the mixture to the emulsifier, and mixing and stirring the mixture in a high-speed stirrer at 1200 rpm under the protection of an inert gas, nitrogen;

[0031] (3) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 10 minutes, and add the formic acid / acetic acid mixture to mix well;

[0032] (4) Finally, add all the water, mix well, and react at 150° C. for 30 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0033] Embodiment 2:

[0034] The preparation method of the polymer modified epoxy resin toughening agent of this embodiment 2 specifically comprises the following steps:

[0035] (1) Weigh the following raw materials in parts by weight for later use;

[0036] 130 parts of modified polyurethane aqueous solution, 20 parts of polystyrene / polyamide mixture, 70 parts of amino-terminated liquid nitrile rubber, 21 parts of emulsifier, 8 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 17 parts of phenolphthalein type polyaryletherketone, 27 parts of formic acid / acetic acid mixture, and 30 parts of water;

[0037] The polystyrene / polyamide mixture is composed of a polystyrene and polyamide mixture in a mass ratio of 1:3.

[0038] The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of nano-silicon dioxide and nano-zirconium dioxide in a mass ratio of 6:1.

[0039] The formic acid / acetic acid mixture is composed of formic acid and acetic acid in a volume ratio of 3:1.

[0040] (2) mixing the amino-terminated liquid nitrile rubber, the modified polyurethane aqueous solution, and the phenolphthalein type polyaryletherketone at 70° C., heating to 100° C., adding the mixture to the emulsifier, and mixing and stirring the mixture in a high-speed stirrer at 1200 rpm under the protection of an inert gas, nitrogen;

[0041] (3) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 10 minutes, and add the formic acid / acetic acid mixture to mix well;

[0042] (4) Finally, add all the water, mix well, and react at 150° C. for 30 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0043] Embodiment 3:

[0044] The preparation method of the polymer modified epoxy resin toughening agent of this embodiment 3 specifically comprises the following steps:

[0045] (1) Weigh the following raw materials in parts by weight for later use;

[0046] 95 parts of modified polyurethane aqueous solution, 15 parts of polystyrene / polyamide mixture, 60 parts of amino-terminated liquid nitrile rubber, 17 parts of emulsifier, 6 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 12 parts of phenolphthalein type polyaryletherketone, 22 parts of formic acid / acetic acid mixture, and 25 parts of water;

[0047] The polystyrene / polyamide mixture is composed of a polystyrene and polyamide mixture in a mass ratio of 1:3.

[0048] The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of nano-silicon dioxide and nano-zirconium dioxide in a mass ratio of 5:1.

[0049] The formic acid / acetic acid mixture is composed of formic acid and acetic acid in a volume ratio of 3:1.

[0050] (2) mixing the amino-terminated liquid nitrile rubber, the modified polyurethane aqueous solution, and the phenolphthalein type polyaryletherketone at 75° C., heating the mixture to 105° C., adding the mixture to the emulsifier, and mixing and stirring the mixture in a high-speed stirrer at 1300 rpm under the protection of an inert gas, nitrogen;

[0051] (3) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 10 minutes, and add the formic acid / acetic acid mixture to mix well;

[0052] (4) Finally, add all the water, mix well, and react at 150° C. for 20 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0053] Embodiment 4:

[0054] The preparation method of the polymer modified epoxy resin toughening agent of this embodiment 4 specifically comprises the following steps:

[0055] (1) Weigh the following raw materials in parts by weight for later use;

[0056] 150 parts of modified polyurethane aqueous solution, 25 parts of polystyrene / polyamide mixture, 80 parts of amino-terminated liquid nitrile rubber, 25 parts of emulsifier, 10 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 20 parts of phenolphthalein type polyaryletherketone, 30 parts of formic acid / acetic acid mixture, and 40 parts of water;

[0057] The polystyrene / polyamide mixture is composed of a polystyrene and polyamide mixture in a mass ratio of 1:3.

[0058] The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of a mass ratio of nano-silicon dioxide to nano-zirconium dioxide of 8:1.

[0059] The formic acid / acetic acid mixture is composed of formic acid and acetic acid in a volume ratio of 3:1.

[0060] (2) mixing the amino-terminated liquid nitrile rubber, the modified polyurethane aqueous solution, and the phenolphthalein type polyaryletherketone at 65° C., heating the mixture to 95° C., adding the mixture to the emulsifier, and mixing the mixture in a high-speed stirrer at 1000 rpm under the protection of an inert gas, nitrogen;

[0061] (3) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 5 minutes, and add the formic acid / acetic acid mixture to mix well;

[0062] (4) Finally, add all the water, mix well, and react at 145° C. for 20 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0063] Embodiment 5:

[0064] The preparation method of the polymer modified epoxy resin toughening agent of this embodiment 5 specifically comprises the following steps:

[0065] (1) Weigh the following raw materials in parts by weight for later use;

[0066] 80 parts of modified polyurethane aqueous solution, 10 parts of polystyrene / polyamide mixture, 50 parts of amino-terminated liquid nitrile rubber, 15 parts of emulsifier, 5 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 10 parts of phenolphthalein type polyaryletherketone, 20 parts of formic acid / acetic acid mixture, and 20 parts of water;

[0067] The polystyrene / polyamide mixture is composed of a polystyrene and polyamide mixture in a mass ratio of 1:3.

[0068] The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of nano-silicon dioxide and nano-zirconium dioxide in a mass ratio of 10:1.

[0069] The formic acid / acetic acid mixture is composed of formic acid and acetic acid in a volume ratio of 3:1.

[0070] (2) mixing the amino-terminated liquid nitrile rubber, the modified polyurethane aqueous solution, and the phenolphthalein type polyaryletherketone at 75° C., heating the mixture to 95° C., adding the mixture to the emulsifier, and mixing the mixture in a high-speed stirrer at 1000 rpm under the protection of an inert gas, nitrogen;

[0071] (3) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 10 minutes, and add the formic acid / acetic acid mixture to mix well;

[0072] (4) Finally, add all the water, mix well, and react at 145° C. for 35 minutes. After the mixing reaction is completed, the toughening agent is obtained.

[0073] Comparative Example 1:

[0074] The preparation method of the polymer modified epoxy resin toughening agent of this comparative example 1 specifically comprises the following steps:

[0075] (1) Weigh the following raw materials in parts by weight for later use:

[0076] 80 parts of modified polyurethane aqueous solution, 10 parts of polystyrene, 50 parts of amino-terminated liquid nitrile rubber, 15 parts of emulsifier, 5 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 10 parts of phenolphthalein type polyaryletherketone, 20 parts of formic acid / acetic acid mixture, and 20 parts of water;

[0077] (2) The preparation method is the same as that in Example 1.

[0078] Comparative Example 2:

[0079] The preparation method of the polymer modified epoxy resin toughening agent of this comparative example 2 specifically comprises the following steps:

[0080] (1) Weigh the following raw materials in parts by weight for later use:

[0081] 80 parts of modified polyurethane aqueous solution, 10 parts of polystyrene / polyamide mixture, 50 parts of amino-terminated liquid nitrile rubber, 15 parts of emulsifier, 10 parts of phenolphthalein type polyaryletherketone, 20 parts of formic acid / acetic acid mixture, and 20 parts of water;

[0082] (2) The preparation method is the same as that in Example 1.

[0083] Comparative Example 3:

[0084] The preparation method of the polymer modified epoxy resin toughening agent of this comparative example 3 specifically comprises the following steps:

[0085] (1) Weigh the following raw materials in parts by weight for later use:

[0086] 80 parts of modified polyurethane aqueous solution, 10 parts of polystyrene / polyamide mixture, 50 parts of amino-terminated liquid nitrile rubber, 15 parts of emulsifier, 5 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 20 parts of formic acid / acetic acid mixture, and 20 parts of water;

[0087] (2) The preparation method is the same as that in Example 1.

[0088] Comparative Example 4:

[0089] The preparation method of the polymer modified epoxy resin toughening agent of this comparative example 4 specifically comprises the following steps:

[0090] (1) Weigh the following raw materials in parts by weight for later use:

[0091] 80 parts of modified polyurethane aqueous solution, 10 parts of polystyrene / polyamide mixture, 50 parts of amino-terminated liquid nitrile rubber, 15 parts of emulsifier, 5 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 10 parts of phenolphthalein type polyaryletherketone, 20 parts of formic acid, and 20 parts of water;

[0092] (2) The preparation method is the same as that in Example 1.

[0093] 1. The toughening agent prepared in Examples 1-5 and Comparative Examples 1-4 was added to the modified epoxy resin for toughening (addition amount 9.2%). After toughening, the modified epoxy resin was cured at room temperature and subjected to mechanical property test to test the effect of the toughening agent on the mechanical properties of the epoxy resin, and the test results and statistical data were recorded. The test was specifically conducted in accordance with the GB / T 1843-2008 test standard.

[0094] Table 1 shows the mechanical properties test of the toughening agent prepared in Examples 1-5 after toughening the modified epoxy resin.

[0095]

[0096] Table 2 shows the mechanical properties test of the toughening agent-modified epoxy resin prepared in Comparative Examples 1-4.

[0097]

[0098] Based on the above, we can conclude that:

[0099] (1) Tougheners can effectively improve the impact toughness and tensile strength of epoxy resin systems;

[0100] (2) It can be concluded from the examples and comparative example 1 that the polystyrene / polyamide mixture has a significant effect on improving the overall impact toughness of the epoxy resin system. The polystyrene / polyamide mixture can produce a cross-linking reaction after being mixed with the epoxy resin, thereby preventing the fracture toughness of the epoxy resin;

[0101] (3) It can be concluded from the examples and comparative example 2 that the addition of the nano-silicon dioxide / nano-zirconium dioxide mixture can be dispersed into the epoxy resin system, which can improve the overall fracture strength of the system.

[0102] 2. Add the toughening agent to the epoxy resin system according to the added amount, and test the mechanical properties of the toughened epoxy resin system; use the toughening agent prepared in Example 1, control the added amount of the toughening agent, and add it to the modified epoxy resin for toughening.

[0103] According to the different addition amounts, Examples 6-10 and Comparative Examples 5-8 were specifically established.

[0104] Comparative Example 5: The amount of toughening agent added is 5%;

[0105] Comparative Example 6: The amount of toughening agent added is 6%

[0106] Example 6: The amount of toughening agent added is 6.5%;

[0107] Example 7: The amount of toughening agent added is 7%;

[0108] Example 8: The amount of toughening agent added is 8%;

[0109] Example 9: The addition amount of toughening agent is 10%;

[0110] Example 10: The amount of toughening agent added is 11.5%;

[0111] Comparative Example 7: The amount of toughening agent added is 12%;

[0112] Comparative Example 8: The amount of toughening agent added is 13%;

[0113] Blank group: no toughening agent was added.

[0114] The epoxy resin was modified and toughened by adding different amounts of toughening agent, and the mechanical properties of the epoxy resin system were tested after curing to detect the effects of different amounts of toughening agent on the mechanical properties of the epoxy resin system. Tables 3 and 4 show the toughening agent prepared in Example 1, and the epoxy resin system was modified by controlling different addition amounts of the toughening agent, and the data of its mechanical properties were statistically collated, wherein a blank group (without toughening agent added) was set in both sets of data for comparison.

[0115] Table 3 shows the toughening agents prepared in Example 1 in Examples 6-10. The toughening agents are used to modify epoxy resin systems at different addition amounts, and the mechanical properties data are statistically collated.

[0116]

[0117] Table 4 shows the toughening agents prepared in Example 1 in Comparative Examples 5-8. The toughening agents are used to modify epoxy resin systems at different addition amounts, and the mechanical properties data are statistically collated.

[0118]

[0119] Based on the above, we can conclude that:

[0120] (1) When the amount of toughening agent increases, the tensile strength of the epoxy resin system first increases and then decreases. When the amount of toughening agent accounts for 9.2%, a higher value of impact strength is obtained. When the tensile strength is 63.8MPa, it is 65.3% higher than the tensile strength of the untoughened system.

[0121] (2) When the toughening agent dosage is 8-9%, the elongation at break is the maximum, which is 116.1% higher than the elongation at break of the untoughened system;

[0122] (3) When the proportion of toughening agent gradually increases, the impact strength of the toughened epoxy resin system increases rapidly at first and then increases slowly, with the maximum value reaching 17.8 KJ / m 2The impact strength of the untoughened system is increased by 58.9%.

[0123] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0124] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A polymer modified epoxy resin toughening agent, characterized in that: The toughening agent is made of the following raw materials in parts by weight: 80-150 parts of modified polyurethane aqueous solution, 10-25 parts of polystyrene / polyamide mixture, 50-80 parts of amino-terminated liquid nitrile rubber, 15-25 parts of emulsifier, 5-10 parts of nano silicon dioxide / nano zirconium dioxide mixture, 10-20 parts of phenolphthalein type polyaryletherketone, 20-30 parts of formic acid / acetic acid mixture, and 20-40 parts of water.

2. The polymer modified epoxy resin toughening agent according to claim 1, characterized in that: The toughening agent is made of the following raw materials in parts by weight: 95-130 parts of modified polyurethane aqueous solution, 15-20 parts of polystyrene / polyamide mixture, 60-70 parts of amino-terminated liquid nitrile rubber, 17-21 parts of emulsifier, 6-8 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 12-17 parts of phenolphthalein type polyaryletherketone, 22-27 parts of formic acid / acetic acid mixture, and 25-30 parts of water.

3. The polymer modified epoxy resin toughening agent according to claim 2, characterized in that: The toughening agent is made of the following raw materials in parts by weight: 115 parts of modified polyurethane aqueous solution, 18 parts of polystyrene / polyamide mixture, 65 parts of amino-terminated liquid nitrile rubber, 18 parts of emulsifier, 7 parts of nano-silicon dioxide / nano-zirconium dioxide mixture, 15 parts of phenolphthalein type polyaryletherketone, 25 parts of formic acid / acetic acid mixture, and 30 parts of water.

4. The polymer modified epoxy resin toughening agent according to claim 1, characterized in that: The polystyrene / polyamide mixture is composed of polystyrene and polyamide in a mass ratio of 1:

3.

5. The polymer modified epoxy resin toughening agent according to claim 1, characterized in that: The nano-silicon dioxide / nano-zirconium dioxide mixture is composed of nano-silicon dioxide and nano-zirconium dioxide in a mass ratio of (5-10):

1.

6. The polymer modified epoxy resin toughening agent according to claim 1, characterized in that: The formic acid / acetic acid mixed solution is composed of formic acid and acetic acid in a volume ratio of 3:

1.

7. The method for preparing the polymer modified epoxy resin toughening agent according to any one of claims 1 to 6, characterized in that: The preparation method specifically comprises the following steps: (1) mixing amino-terminated liquid nitrile rubber, modified polyurethane aqueous solution and phenolphthalein type polyaryletherketone at 65-75° C., heating to 95-105° C., adding to an emulsifier, and mixing and stirring in a high-speed stirrer at 1000-1300 rpm under the protection of inert gas nitrogen; (2) Then add the nano-silicon dioxide / nano-zirconium dioxide mixture and the polystyrene / polyamide mixture, continue stirring for 5-10 minutes, and add the formic acid / acetic acid mixture to mix well; (3) Finally, all the water is added, mixed evenly, and reacted at 145-150° C. for 20-35 minutes. After the mixing reaction is completed, the toughening agent is obtained.

8. Use of the toughening agent according to claim 1 in modified epoxy resin.

9. The use according to claim 8, characterized in that: The dosage of the toughening agent is 6.5-11.5% of the mass of the epoxy resin.

10. The use according to claim 9, characterized in that: The dosage of the toughening agent is 9.2% of the mass of the epoxy resin.

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