Separation method of nitrile rubber emulsion, modified epoxy resin, preparation method and application of modified epoxy resin, and epoxy resin compound

Abstract

The invention provides a nitrile rubber emulsion separation method, modified epoxy resin and a preparation method and application thereof, and an epoxy resin compound, and relates to the technical field of epoxy resin. According to the separation method of the nitrile rubber emulsion, the organic ammonium salt solution is firstly mixed with the irradiated nitrile rubber emulsion and then mixed with the butanone, the butanone phase containing the irradiated nitrile rubber can be obtained through separation, the nitrile rubber is transferred from a water phase to an organic phase, the separation effect is high, and the use amount of a solvent is small. The obtained butanone phase can be directly mixed with the epoxy resin, the grinding process of emulsion spray drying and mixing with the epoxy resin is omitted, the process is simple, and nano-scale dispersion of particles in the epoxy resin can be achieved through a phase transfer method.

Description

Technical Field

[0001] The present application relates to the technical field of epoxy resins, and in particular to a method for separating nitrile rubber emulsions, modified epoxy resins, preparation methods and applications thereof, and epoxy resin composites. Background Art

[0002] Epoxy resin has excellent heat resistance and electrical properties and is widely used in electrical insulation materials. However, epoxy resin has the problem of being brittle after curing and having poor impact resistance and stress cracking resistance. In the prior art, rubber components are added to epoxy resin to improve the toughness of epoxy resin. However, although conventional nitrile rubber can significantly improve the impact resistance of epoxy resin, its heat resistance will decrease.

[0003] In order to improve the toughness of epoxy resin while maintaining the heat resistance of epoxy resin, the prior art adds a high-energy radiation source to the epoxy resin to obtain a fully vulcanized powder rubber for irradiation crosslinking. The addition of this type of rubber can simultaneously improve the impact strength, glass transition temperature and heat deformation temperature of the thermosetting epoxy resin. However, the preparation method of the fully vulcanized powder rubber obtained by irradiation crosslinking with a high-energy radiation source requires spray drying of the irradiated rubber latex, and physical and mechanical grinding is required during the mixing process with the epoxy resin. The preparation process is complicated, and the rubber particles cannot be evenly dispersed. Summary of the invention

[0004] The purpose of the present application is to provide a method for separating nitrile rubber emulsion, a modified epoxy resin and its preparation method and application, and an epoxy resin composite, aiming to solve the problems of complex process and uneven dispersion of irradiated rubber particles added to existing epoxy resins.

[0005] To achieve the above objectives, the present application provides a method for separating a nitrile rubber emulsion, comprising:

[0006] The organic ammonium salt solution is first mixed with the irradiated nitrile rubber latex to obtain a first mixture;

[0007] Mixing the first mixture with butanone for a second time to obtain a second mixture;

[0008] The second mixture is allowed to stand and separated to obtain a water phase and a butanone phase containing irradiated nitrile rubber.

[0009] In some embodiments, the first mixing of the organic ammonium salt solution and the irradiated nitrile rubber latex comprises:

[0010] Dissolving an organic ammonium salt in water and stirring to obtain the organic ammonium salt solution;

[0011] The irradiated nitrile rubber emulsion is added dropwise into the organic ammonium salt solution, and stirred evenly to obtain the first mixture.

[0012] In some embodiments, at least one of the following conditions is met:

[0013] A. The stirring speed is 300-1000rpm;

[0014] B. The mass of the organic ammonium salt is 0.01%-1.5% of the mass of the water;

[0015] C. the mass ratio of the water to the butanone is 0.4-0.9;

[0016] D. The mass ratio of the organic ammonium salt to the mass ratio of the nitrile rubber in the irradiated nitrile rubber emulsion is 0.01 to 1.

[0017] In some embodiments, the second mixing of the first mixture with butanone comprises:

[0018] The butanone is added dropwise into the first mixture while stirring, or the first mixture is added dropwise into the butanone while stirring; the dropping speed is 5-25 mL / min.

[0019] In some embodiments, the organic ammonium salt includes any one of benzylethylammonium chloride, isopropylammonium bromide, and tetrapropylammonium iodide.

[0020] The present application also provides a method for preparing a modified epoxy resin, comprising mixing the butanone phase prepared by the above-mentioned separation method of the nitrile rubber emulsion with an epoxy resin, and removing the volatile phase to obtain the modified epoxy resin.

[0021] In some embodiments, the mass of the irradiated nitrile rubber in the butanone phase is 1-30% of the mass of the epoxy resin.

[0022] In some embodiments, the excluding the volatile phase comprises: placing the mixture of the butanone phase and the epoxy resin in a rotary evaporator to evaporate the volatile substances by vacuum heating until constant weight is reached.

[0023] The present application also provides a modified epoxy resin, which is prepared by the above-mentioned preparation method of the modified epoxy resin.

[0024] The present application also provides the use of the modified epoxy resin in preparing electrical insulating parts.

[0025] The present application also provides an epoxy resin composite, comprising the above-mentioned modified epoxy resin and a curing agent.

[0026] Compared with the prior art, the beneficial effects of this application include:

[0027] The method for separating nitrile rubber emulsion provided in the present application first mixes an organic ammonium salt solution with the irradiated nitrile rubber emulsion, and then mixes it with butanone, so as to separate a butanone phase containing the irradiated nitrile rubber, and transfer the nitrile rubber from the aqueous phase to the organic phase, with high separation effect and small amount of solvent used.

[0028] The butanone phase obtained by the separation method of the nitrile rubber emulsion provided in the present application can be directly mixed with the epoxy resin, thereby omitting the spray drying of the emulsion and the grinding process of mixing with the epoxy resin. The process is simple and the particles can be dispersed at the nanoscale in the epoxy resin by a phase transfer method. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope of the present application.

[0030] Figure 1 The schematic diagram of the process of separating the nitrile rubber emulsion of the present application is shown in FIG. DETAILED DESCRIPTION

[0031] As used herein:

[0032] "Prepared from" is synonymous with "comprising." As used herein, the terms "comprising," "including," "having," "containing," or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises the listed elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.

[0033] The conjunction "consisting of excludes any unspecified element, step, or component. If used in a claim, this phrase renders the claim closed-ended so that it does not include materials other than those described, except for conventional impurities associated therewith. When the phrase "consisting of" appears in a clause of the body of a claim rather than immediately following the subject matter, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0034] When an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted as including ranges "1 to 4", "1 to 3", "1 to 2", "1 to 2 and 4 to 5", "1 to 3 and 5", etc. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end values ​​and all integers and fractions within the range.

[0035] In these examples, parts and percentages are by mass unless otherwise indicated.

[0036] "Parts by mass" refers to the basic unit of measurement for expressing the mass ratio of multiple components. 1 part can represent any unit mass, such as 1g or 2.689g. If we say that the mass of component A is a parts and the mass of component B is b parts, it means the ratio of the mass of component A to the mass of component B is a:b. Alternatively, it means that the mass of component A is aK and the mass of component B is bK (K is an arbitrary number, indicating a multiple factor). It should not be misunderstood that, unlike the mass parts, the sum of the mass of all components is not limited to 100 parts.

[0037] "And / or" is used to indicate that one or both of the stated situations may occur, for example, A and / or B includes (A and B) and (A or B).

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] This application provides a method for separating nitrile rubber emulsion, please refer to Figure 1 ,include:

[0040] S100: first mixing the organic ammonium salt solution with the irradiated nitrile rubber latex to obtain a first mixture;

[0041] S200: performing a second mixing of the first mixture and butanone to obtain a second mixture;

[0042] S300: the second mixture is allowed to stand and separated to obtain a water phase and a butanone phase containing the irradiated nitrile rubber.

[0043] The method for separating nitrile rubber emulsion provided in the present application first mixes an organic ammonium salt solution with the irradiated nitrile rubber emulsion, and then mixes it with butanone, so as to separate a butanone phase containing the irradiated nitrile rubber, and transfer the nitrile rubber from the aqueous phase to the organic phase, with high separation effect and small amount of solvent used.

[0044] In some embodiments, the first mixing of the organic ammonium salt solution and the irradiated nitrile rubber emulsion in step S100 includes:

[0045] Dissolving an organic ammonium salt in water and stirring to obtain the organic ammonium salt solution;

[0046] The irradiated nitrile rubber emulsion is added dropwise into the organic ammonium salt solution, and stirred evenly to obtain the first mixture.

[0047] In some embodiments, the stirring speed is 300-1000 rpm, for example, it can be 300 rpm, 400 rpm, 500 rpm, 600 rpm, 700 rpm, 800 rpm, 900 rpm, 1000 rpm or any value between 300-1000 rpm.

[0048] In some embodiments, the mass of the organic ammonium salt is 0.01%-1.5% of the mass of the water, for example, it can be 0.01%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5% or any value between 0.01%-1.5%.

[0049] In some embodiments, the mass ratio of the water to the butanone is 0.4-0.9, for example, it can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or any value between 0.4 and 0.9.

[0050] In some embodiments, the mass ratio of the organic ammonium salt to the mass ratio of the nitrile rubber in the irradiated nitrile rubber emulsion is 0.01 to 1, for example, it can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 or any value between 0.01 and 1.

[0051] In some embodiments, the second mixing of the first mixture and butanone in step S200 includes:

[0052] The butanone is added dropwise into the first mixture while stirring, or the first mixture is added dropwise into the butanone while stirring; the dropping speed is 5-25 mL / min, for example, it can be 5 mL / min, 7 mL / min, 9 mL / min, 10 mL / min, 12 mL / min, 15 mL / min, 17 mL / min, 20 mL / min, 22 mL / min, 25 mL / min or any value between 5-25 mL / min.

[0053] In some embodiments, the organic ammonium salt includes any one of benzylethylammonium chloride, isopropylammonium bromide, and tetrapropylammonium iodide.

[0054] The present application also provides a method for preparing a modified epoxy resin, comprising mixing the butanone phase prepared by the above-mentioned separation method of the nitrile rubber emulsion with an epoxy resin, and removing the volatile phase to obtain the modified epoxy resin.

[0055] The butanone phase obtained by the separation method of the nitrile rubber emulsion provided in the present application can be directly mixed with the epoxy resin, thereby omitting the spray drying of the emulsion and the grinding process of mixing with the epoxy resin. The process is simple and the particles can be dispersed at the nanoscale in the epoxy resin by a phase transfer method.

[0056] In some embodiments, the mass of the irradiated nitrile rubber in the butanone phase is 1-30% of the mass of the epoxy resin, for example, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30% or any value between 1-30%.

[0057] In some embodiments, the excluding the volatile phase comprises: placing the mixture of the butanone phase and the epoxy resin in a rotary evaporator to evaporate the volatile substances by vacuum heating until constant weight is reached.

[0058] The present application also provides a modified epoxy resin, which is prepared by the above-mentioned preparation method of the modified epoxy resin.

[0059] The present application also provides the use of the modified epoxy resin in preparing electrical insulation parts, wherein the electrical insulation parts may be transformers, mutual inductors, and the like.

[0060] The present application also provides an epoxy resin composite, comprising the above-mentioned modified epoxy resin and a curing agent.

[0061] Among them, commonly used curing agents can be selected from polyamines (diaminodiphenyl sulfone, dicyandiamide, etc.), anhydrides (phthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, etc.) and polyamide polymers. In addition, accelerators such as DY062 and DMP-30 can also be added to the epoxy resin composite. The processing and curing methods of the thermosetting resin involved in the method of the present application can all be carried out by conventional methods in the prior art.

[0062] The embodiments of the present application will be described in detail below in conjunction with specific examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present application and should not be considered as limiting the scope of the present application. If specific conditions are not specified in the examples, they are carried out according to normal conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0063] The irradiated nitrile rubber latex VP501 used in the following examples and comparative examples was purchased from Beijing Chemical Research Institute Co., Ltd.

[0064] Example 1

[0065] The present embodiment provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0066] Under stirring at 500 rpm, 0.1 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water, and after complete dissolution, a tetrabutylammonium bromide solution was obtained. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the tetrabutylammonium bromide solution, and the mixture was stirred evenly to obtain a first mixture.

[0067] 17.5 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0068] The second mixture was allowed to stand and then naturally separated to obtain 8.5 g of water phase and 19.06 g of butanone phase. At this time, the irradiated nitrile rubber completely entered the butanone organic phase, and the mass proportion of the irradiated nitrile rubber in the butanone phase was 5.23%.

[0069] This embodiment also provides a modified epoxy resin, and the preparation method thereof comprises the following steps:

[0070] 19.06 g of butanone phase obtained in Example 1 was mixed with 32.5 g of epoxy resin, and the mixture was placed in a rotary evaporator to evaporate volatile substances by vacuum heating until constant weight was obtained to obtain the modified epoxy resin of Example 1.

[0071] Example 2

[0072] The present embodiment provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0073] Under stirring at 500 rpm, 0.1 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water to obtain an organic ammonium salt solution after complete dissolution. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the organic ammonium salt solution and stirred evenly to obtain a first mixture.

[0074] 12.5 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0075] The second mixture was allowed to stand and then naturally separated to obtain 8.65 g of water phase and 13.83 g of butanone phase. At this time, the irradiated nitrile rubber completely entered the butanone organic phase, and the mass proportion of the irradiated nitrile rubber in the butanone phase was 7.23%.

[0076] This embodiment also provides a modified epoxy resin, and the preparation method thereof comprises the following steps:

[0077] 13.83 g of butanone phase obtained in Example 2 was mixed with 33.33 g of epoxy resin, and the mixture was placed in a rotary evaporator to evaporate volatile substances by vacuum heating until constant weight was obtained to obtain the modified epoxy resin of Example 2.

[0078] Example 3

[0079] The present embodiment provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0080] Under stirring at 500 rpm, 0.05 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water to obtain an organic ammonium salt solution after complete dissolution. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the organic ammonium salt solution and stirred evenly to obtain a first mixture.

[0081] 15 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0082] The second mixture was allowed to stand and then naturally separated to obtain 7.22 g of water phase and 17.78 g of butanone phase. At this time, the irradiated nitrile rubber completely entered the butanone organic phase, and the mass proportion of the irradiated nitrile rubber in the butanone phase was 5.63%.

[0083] This embodiment also provides a modified epoxy resin, and the preparation method thereof comprises the following steps:

[0084] 17.78 g of butanone phase obtained in Example 3 was mixed with 33.37 g of epoxy resin, and the mixture was placed in a rotary evaporator to evaporate volatile substances by vacuum heating until constant weight was obtained to obtain the modified epoxy resin of Example 3.

[0085] Comparative Example 1

[0086] This comparative example provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0087] Under stirring at 500 rpm, 0.15 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water to obtain an organic ammonium salt solution after complete dissolution. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the organic ammonium salt solution and stirred evenly to obtain a first mixture.

[0088] 15 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0089] The second mixture was allowed to stand and then separated naturally, and a large number of particles were present in the aqueous phase.

[0090] Comparative Example 2

[0091] This comparative example provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0092] Under stirring at 500 rpm, 2.66 g of irradiated nitrile rubber latex VP501 (solid content of 37.5%) was added dropwise into 7.32 g of deionized water, and stirred evenly to obtain a first mixture.

[0093] 15 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 300-1000 rpm for 5-15 min; finally, the stirring was stopped to obtain a second mixture.

[0094] The second mixture could not be separated after standing, and a butanone phase containing irradiated nitrile rubber could not be obtained.

[0095] Comparative Example 3

[0096] This comparative example provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0097] Under stirring at 5000 rpm, 0.1 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water to obtain an organic ammonium salt solution after complete dissolution. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the organic ammonium salt solution and stirred evenly to obtain a first mixture.

[0098] 24.4 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0099] The second mixture was separated naturally after being left to stand, and a large number of particles were present in the aqueous phase.

[0100] Comparative Example 4

[0101] This comparative example provides a method for separating a nitrile rubber emulsion, comprising the following steps:

[0102] Under stirring at 500 rpm, 0.1 g of organic ammonium salt tetrabutylammonium bromide was added to 7.32 g of deionized water to obtain an organic ammonium salt solution after complete dissolution. 2.66 g of irradiated nitrile rubber emulsion VP501 (solid content of 37.5%) was added dropwise to the organic ammonium salt solution and stirred evenly to obtain a first mixture.

[0103] 7.32 g of butanone was added dropwise into the first mixture (the dropping speed was 10 mL / min) while stirring; after the dropping was completed, the first mixture was stirred at 500 rpm for 10 min; finally, the stirring was stopped to obtain a second mixture.

[0104] The second mixture was separated naturally after being left to stand, and the separated matter agglomerated.

[0105] The parameters and results of the separation method of the nitrile rubber emulsion of each embodiment and comparative example are shown in Table 1.

[0106] Table 1 Parameters and results of the separation method of the nitrile rubber emulsion of each embodiment and comparative example

[0107]

[0108]

[0109] The performance parameters of the modified epoxy resins prepared in various embodiments are shown in Table 2.

[0110] Table 2 Performance parameters of modified epoxy resin prepared in Example

[0111]

[0112] ISO527-2 2012: Determination of tensile properties of plastics;

[0113] ISO178 2003: Determination of flexural properties of plastics;

[0114] ISO179-1 2010: "Determination of simply supported beam impact strength of plastic rigid materials";

[0115] GBT22567 2008: Test method for determining glass transition temperature of electrical insulating materials.

[0116] As can be seen from Table 2, the tensile strength and flexural strength of the modified epoxy resin prepared by the method of the present application are slightly decreased, the impact strength is improved, and the glass transition temperature is slightly improved compared with the epoxy resin without the addition of irradiated rubber particles. The irradiated nitrile rubber separated by the three embodiments can obtain the test data of Table 2, indicating that the irradiated nitrile rubber separated by the method of the present application can be normally used to prepare toughened modified epoxy resin without negatively affecting the performance of the epoxy resin.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0118] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the above claims, any one of the claimed embodiments may be used in any combination. The information disclosed in this background technology section is intended only to deepen the understanding of the overall background technology of the present application and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for separating a nitrile rubber emulsion, characterized in that: include: The organic ammonium salt solution is first mixed with the irradiated nitrile rubber latex to obtain a first mixture; Mixing the first mixture with butanone for a second time to obtain a second mixture; The second mixture is allowed to stand and separated to obtain a water phase and a butanone phase containing irradiated nitrile rubber.

2. The separation method of acrylonitrile-butadiene rubber emulsion according to claim 1, wherein The first mixing of the organic ammonium salt solution and the irradiated nitrile rubber latex comprises: Dissolving an organic ammonium salt in water and stirring to obtain the organic ammonium salt solution; The irradiated nitrile rubber emulsion is added dropwise into the organic ammonium salt solution, and stirred evenly to obtain the first mixture.

3. The separation method of acrylonitrile-butadiene rubber emulsion according to claim 2, wherein At least one of the following conditions is met: A. The stirring speed is 300-1000rpm; B. The mass of the organic ammonium salt is 0.01%-1.5% of the mass of the water; C. the mass ratio of the water to the butanone is 0.4-0.9; D. The mass ratio of the organic ammonium salt to the mass ratio of the nitrile rubber in the irradiated nitrile rubber emulsion is 0.01 to 1.

4. The separation method of acrylonitrile-butadiene rubber emulsion according to claim 1, wherein The second mixing of the first mixture and butanone comprises: The butanone is added dropwise into the first mixture while stirring, or the first mixture is added dropwise into the butanone while stirring; the dropping speed is 5-25 mL / min.

5. The separation method of acrylonitrile-butadiene rubber emulsion according to claim 1, wherein The organic ammonium salt includes any one of benzylethylammonium chloride, isopropylammonium bromide and tetrapropylammonium iodide.

6. A method for preparing a modified epoxy resin, characterized in that: The method comprises mixing the butanone phase prepared by the separation method of the nitrile rubber emulsion according to any one of claims 1 to 5 with an epoxy resin, and obtaining the modified epoxy resin after removing the volatile phase.

7. The method for preparing the modified epoxy resin according to claim 6, characterized in that: The mass of the irradiated nitrile rubber in the butanone phase is 1-30% of the mass of the epoxy resin.

8. A modified epoxy resin, characterized in that The modified epoxy resin is prepared by the preparation method of the modified epoxy resin according to claim 6 or 7.

9. Use of the modified epoxy resin according to claim 8 in the preparation of electrical insulating parts.

10. An epoxy resin composite, characterized in that: The invention comprises the modified epoxy resin as claimed in claim 8 and a curing agent.

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