Nylon nucleating agent and modified nylon resin comprising the same

Abstract

The present application provides a kind of nylon nucleating agent, including 50-65 parts by weight of polycarbonate and 35-50 parts by weight of fulvic acid modified peanut shell powder;Raw materials for preparing the polycarbonate include bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol, and the molar ratio of the bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol is (0.8-1.2):(0.15-0.35):(0.15-0.35). The present application also provides a modified nylon resin comprising the nylon nucleating agent. The modified nylon resin has high flexural modulus, good aging resistance, and low flexural modulus reduction rate after aging.

Description

Technical Field

[0001] This invention relates to the field of nylon technology, and in particular to a nylon nucleating agent and a modified nylon resin containing the nylon nucleating agent. Background Technology

[0002] Nylon 6 (PA-6), also known as polyamide 6, is an early industrialized nylon material. It is known for its molecular chains, which typically form random coils and clusters, and its tendency to crystallize into folded, lamellar crystalline structures. This results in excellent mechanical properties, making it widely used as a general-purpose plastic. Due to its relatively low strength and softness, low melting point, and good abrasion resistance, self-lubrication, and solvent resistance, Nylon 6 is also widely used in fiber products such as clothing, fabrics, bags, tire cord fabric, conveyor belts, fishing nets, and carpets. It is also used in engineering plastic products for electronic devices, automobiles, and railways, as well as in film products for food and pharmaceutical packaging. Nylon 6 plays a vital role in many fields due to its strength, abrasion resistance, chemical resistance, lightweight, flexibility, and thermal stability, and its application range continues to expand with technological advancements.

[0003] Nucleating agents are commonly used modifiers in the injection molding process of nylon 6, improving the mechanical properties of nylon products. They represent a simple, effective, and efficient modification method for achieving high-performance nylon resins. However, there is still room for improvement in the performance enhancement of nylon resins using existing nucleating agents.

[0004] Therefore, it is necessary to provide an excellent nylon nucleating agent. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems existing in the prior art. Therefore, in a first aspect, the present invention provides a nylon nucleating agent comprising 50-65 parts by weight of polycarbonate and 35-50 parts by weight of humic acid-modified peanut shell powder; the raw materials for preparing the polycarbonate include bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol, wherein the molar ratio of bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol is (0.8-1.2):(0.15-0.35):(0.15-0.35); preferably, the molar ratio is 1:0.25:0.25.

[0006] The polycarbonate prepared using bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol as monomers in a certain proportion, through the above technical solution, can improve the crystallinity of nylon 6, increase the crystallinity of nylon, and make the spherulitic particles of nylon finer. This helps to improve the uniformity of the material, reduce stress concentration, and thus improve the flexural modulus and anti-aging ability of nylon. The fluorine atoms in 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol have high electronegativity, which can enhance the interfacial bonding force of the composite material, thereby improving the overall mechanical properties of the composite material. The position of the fluorine element affects the crystallization rate of the polymer. The combined use of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol makes the polarity of polycarbonate closer to that of nylon, resulting in better compatibility. Furthermore, the distribution of fluorine atoms makes the polarity distribution of the entire chain more uniform, making it easier for this nucleating agent to disperse uniformly in the polar nylon matrix, promoting heterogeneous nucleation, and thus improving the nucleation efficiency. The inventors discovered that when the molar ratio of bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol is (0.8-1.2):(0.15-0.35):(0.15-0.35), nylon exhibits the best flexural modulus and anti-aging properties. Fulvic acid-modified peanut shell powder, used as an inorganic nucleating agent, possesses a higher specific surface area and more suitable pits and micropores for crystallization, providing more nucleation sites and promoting crystallization. The polycarbonate prepared in this application further enhances the compatibility of fulvic acid-modified peanut shell powder in the matrix. The combined use of both unexpectedly and significantly improves the nucleation effect of nylon.

[0007] Fulvic acid-modified peanut shell powder has a unique pitted and microporous structure that differs from other inorganic nucleating agents. The modification with fulvic acid can enhance the mechanical strength of peanut shell powder and change its surface pitted structure, making the pits on its surface able to accommodate nylon and arrange it neatly, thus promoting nucleation. In addition, fulvic acid-modified peanut shell powder has good dispersibility in the system, which can enhance the interfacial bonding force of the composite material, thereby improving the flexural modulus and aging performance of nylon.

[0008] Preferably, in the raw materials for preparing the polycarbonate, the molar ratio of the sum of the molar amounts of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol to the molar amount of bisphenol A is 0.3-0.7:0.8-1.2.

[0009] Preferably, in the raw materials for preparing the polycarbonate, the molar ratio of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol is 0.66-1.5:1.

[0010] Preferably, the preparation method of the fulvic acid modified peanut shell powder includes: adding fulvic acid and peanut shell powder to an organic solvent, mixing evenly, adding p-toluenesulfonic acid, heating to react, cooling, filtering, washing the filter residue, and drying to obtain the fulvic acid modified peanut shell powder.

[0011] Preferably, the mass ratio of fulvic acid to peanut shell powder is 0.375-0.6:1.

[0012] Through the above technical solution, the mass ratio of fulvic acid to peanut shell powder needs to be controlled at a certain ratio. When the mass ratio of fulvic acid to peanut shell powder is too high, fulvic acid will damage the indentations of peanut shell powder, affecting the nucleation of nylon. When the mass ratio of fulvic acid to peanut shell powder is too low, the dispersibility of fulvic acid-modified peanut shell powder in the system becomes poor, and the interfacial bonding force of the composite material weakens. Through the inventor's experimental research, the mass ratio of fulvic acid to peanut shell powder is 0.375-0.6:1, and the modified nylon resin has the best performance.

[0013] Preferably, the peanut shell powder is modified peanut shell powder, and the preparation method of the modified peanut shell powder includes: soaking peanut shell powder in an alkaline solution, filtering, washing the filter residue, and drying to obtain the modified peanut shell powder.

[0014] Preferably, the method for preparing the polycarbonate includes: using bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol as comonomers, and preparing the polycarbonate by the phosgene method.

[0015] In a second aspect, the present invention provides a modified nylon resin comprising 97-99 parts by weight of nylon resin and 1-3 parts by weight of the above-mentioned nylon nucleating agent.

[0016] Preferably, the nylon resin is at least one of PA6, PA66, PA11, PA12, PA46, PA610, PA612 and PA1010.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. This invention provides a nylon nucleating agent, comprising 50-65 parts by weight of polycarbonate and 35-50 parts by weight of humic acid-modified peanut shell powder. The raw materials for preparing the polycarbonate include bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol, wherein the molar ratio of bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol is (0.8-1.2):(0.15-0.35):

[0019] (0.15-0.35). Polycarbonate prepared using bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol as monomers in a certain proportion can improve the crystallinity of nylon 6, increase the crystallinity of nylon, and make the spherulitic particles of nylon finer, which helps to improve the uniformity of the material, reduce stress concentration, and thus improve the flexural modulus and anti-aging ability of nylon. The fluorine atoms in 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol have high electronegativity, which can enhance the interfacial bonding force of the composite material, thereby improving the overall mechanical properties of the composite material. The position of the fluorine element affects the crystallization rate of the polymer. The combined use of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol makes the polarity of polycarbonate closer to that of nylon, thus improving compatibility. In addition, the distribution of fluorine atoms makes the polarity distribution of the entire chain more uniform, and this nucleating agent is easier to disperse uniformly in the polar nylon matrix, thereby improving the nucleation efficiency. As an inorganic nucleating agent, fulvic acid-modified peanut shell powder has a higher specific surface area and more and more suitable pits and micropores for crystallization. The pits on the surface can accommodate nylon and make it align, promoting nucleation. In addition, fulvic acid-modified peanut shell powder has good dispersibility in the system, which can enhance the interfacial bonding force of the composite material, thereby improving the flexural modulus of nylon.

[0020] 2. This invention provides a modified nylon resin, comprising 97-99 parts by weight of nylon resin and 1-3 parts by weight of the aforementioned nylon nucleating agent. This modified nylon resin has a high flexural modulus, good aging resistance, and a low rate of decrease in flexural modulus after aging. Detailed Implementation

[0021] The present invention will be further described below with reference to specific embodiments. However, the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified, specific conditions in the following embodiments are performed under conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the methods used are conventional methods known in the art, and the consumables and reagents used are commercially available. Unless otherwise stated, the technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods or materials similar to or equivalent to those described herein may also be applied to the present invention. Peanut shell powder is peanut shells dried and refined to a particle size of 10-30 μm. Walnut shell powder is walnut shells dried and refined to a particle size of 10-30 μm. Fulvic acid was purchased from Zhengzhou Aikem Chemical Co., Ltd., CAS: 479-66-3. Humic acid was purchased from Hubei Nuona Technology Co., Ltd., CAS: 1415-93-6. 4-Fluoro-3-hydroxybenzyl alcohol: CAS No.: 934241-78-8. 2-Hydroxy-4-fluorobenzyl alcohol: CAS No.: 773873-09-9.

[0022] Preparation Example 1

[0023] The preparation method of polycarbonate includes the following steps:

[0024] In a nitrogen-protected reaction vessel, 228.2 g (1.0 mol) of bisphenol A, 35.5 g (0.25 mol) of 4-fluoro-3-hydroxybenzyl alcohol, 35.5 g (0.25 mol) of 2-hydroxy-4-fluorobenzyl alcohol, 124 g (3.1 mol) of sodium hydroxide, 780 g of water, and 1500 g of dichloromethane were added. 1.75 mol of phosgene was introduced to initiate an interfacial polycondensation reaction at 28 °C for 30 min, yielding a prepolymer. 4.5 g of p-tert-butylphenol, a capping agent, was added to the prepolymer. After complete dissolution, 60 g of a 1% (w / w) triethylamine dichloromethane solution was added over 60 min. A 32% (w / w) NaOH aqueous solution was then added, with the total molar amount of NaOH added being 480% of the total molar amount of excess phosgene, resulting in a polymerization liquid. This liquid was then separated, purified, and the organic solvent was removed to obtain polycarbonate.

[0025] Preparation Example 2

[0026] The difference between Preparation Example 2 and Preparation Example 1 is that the molar amounts of monomers bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol are different. Specifically, bisphenol A is 1.0 mol, 4-fluoro-3-hydroxybenzyl alcohol is 0.2 mol, and 2-hydroxy-4-fluorobenzyl alcohol is 0.3 mol.

[0027] Preparation Example 3

[0028] The difference between Preparation Example 3 and Preparation Example 1 is that the molar amounts of monomers bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol are different. Specifically, bisphenol A is 1.0 mol, 4-fluoro-3-hydroxybenzyl alcohol is 0.3 mol, and 2-hydroxy-4-fluorobenzyl alcohol is 0.2 mol.

[0029] Preparation Example 4

[0030] The difference between Preparation Example 4 and Preparation Example 1 is that the molar amounts of monomers bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol are different. Specifically, bisphenol A is 0.8 mol, 4-fluoro-3-hydroxybenzyl alcohol is 0.35 mol, and 2-hydroxy-4-fluorobenzyl alcohol is 0.35 mol.

[0031] Preparation Example 5

[0032] The difference between Preparation Example 5 and Preparation Example 1 is that the molar amounts of monomers bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol, and 2-hydroxy-4-fluorobenzyl alcohol are different. Specifically, bisphenol A is 1.2 mol, 4-fluoro-3-hydroxybenzyl alcohol is 0.15 mol, and 2-hydroxy-4-fluorobenzyl alcohol is 0.15 mol.

[0033] Preparation Example 6

[0034] The difference between Preparation Example 6 and Preparation Example 1 is that the monomer 2-hydroxy-4-fluorobenzyl alcohol is not added. The molar amounts of the monomers bisphenol A and 4-fluoro-3-hydroxybenzyl alcohol are as follows: 1.0 mol of bisphenol A and 0.5 mol of 4-fluoro-3-hydroxybenzyl alcohol.

[0035] Preparation Example 7

[0036] The difference between Preparation Example 7 and Preparation Example 1 is that the monomer 4-fluoro-3-hydroxybenzyl alcohol is not added, and the molar amounts of monomers bisphenol A and 2-hydroxy-4-fluorobenzyl alcohol are: 1.0 mol of bisphenol A and 0.5 mol of 2-hydroxy-4-fluorobenzyl alcohol.

[0037] Preparation Example 8

[0038] The preparation method of humic acid modified peanut shell powder includes the following steps:

[0039] Step a: Soak 50g of peanut shell powder in 400g of 15% sodium hydroxide solution for 30min, filter, wash the filter residue with deionized water until neutral, and dry to obtain modified peanut shell powder;

[0040] Step b: Add 20g of fulvic acid and 40g of modified peanut shell powder to 100mL of cyclohexane, mix well, add 4g of p-toluenesulfonic acid, then reflux at 120℃ for 1h, cool to room temperature, filter, wash the filter residue with deionized water until neutral, and dry to obtain fulvic acid modified peanut shell powder.

[0041] Preparation Example 9

[0042] The difference between Preparation Example 9 and Preparation Example 8 is that the amount of fulvic acid used in step b is different. In Preparation Example 9, the amount of fulvic acid used is 15g.

[0043] Preparation Example 10

[0044] The difference between Preparation Example 10 and Preparation Example 8 is that the amount of fulvic acid used in step b is different. In Preparation Example 10, the amount of fulvic acid used is 24g.

[0045] Preparation Example 11

[0046] The difference between Preparation Example 11 and Preparation Example 8 is that the preparation method of fulvic acid modified peanut shell powder does not include step a. Instead, the peanut shell powder is directly modified with fulvic acid. Specifically, 20g of fulvic acid and 40g of peanut shell powder are added to 100mL of cyclohexane, mixed evenly, and 4g of p-toluenesulfonic acid is added. The mixture is then refluxed at 120℃ for 1h. After the reaction is completed, the mixture is cooled to room temperature, filtered, and the filter residue is washed with deionized water until neutral. The residue is then dried to obtain fulvic acid modified peanut shell powder.

[0047] Preparation Example 12

[0048] The difference between Preparation Example 12 and Preparation Example 8 is that humic acid was replaced with an equal mass of humic acid to obtain humic acid-modified peanut shell powder.

[0049] Preparation Example 13

[0050] The difference between Preparation Example 13 and Preparation Example 8 is that walnut shell powder of equal mass was used to replace peanut shell powder to obtain humic acid modified walnut shell powder.

[0051] Example 1

[0052] The nylon nucleating agent was obtained by mixing 60 parts by weight of polycarbonate prepared by the preparation method of Preparation Example 1 and 40 parts by weight of humic acid-modified peanut shell powder prepared by the preparation method of Preparation Example 8.

[0053] Example 2

[0054] The difference between Example 2 and Example 1 is that the polycarbonate was prepared by the preparation method of Example 2.

[0055] Example 3

[0056] The difference between Example 3 and Example 1 is that the polycarbonate was prepared by the preparation method of Example 3.

[0057] Example 4

[0058] The difference between Example 4 and Example 1 is that the polycarbonate was prepared by the preparation method of Example 4.

[0059] Example 5

[0060] The difference between Example 5 and Example 1 is that the polycarbonate was prepared by the preparation method of Example 5.

[0061] Example 6

[0062] The difference between Example 6 and Example 1 is that the humic acid modified peanut shell powder is prepared by the preparation method of Example 9.

[0063] Example 7

[0064] The difference between Example 7 and Example 1 is that the humic acid modified peanut shell powder was prepared by the preparation method of Example 10.

[0065] Example 8

[0066] The difference between Example 8 and Example 1 is that the humic acid modified peanut shell powder was prepared by the preparation method of Example 11.

[0067] Example 9

[0068] The nylon nucleating agent was obtained by mixing 50 parts by weight of polycarbonate prepared by the preparation method of Preparation Example 1 and 50 parts by weight of humic acid modified peanut shell powder prepared by the preparation method of Preparation Example 8.

[0069] Example 10

[0070] The nylon nucleating agent was obtained by mixing 65 parts by weight of polycarbonate prepared by the preparation method of Preparation Example 1 and 35 parts by weight of humic acid modified peanut shell powder prepared by the preparation method of Preparation Example 8.

[0071] Comparative Example 1

[0072] The difference between Comparative Example 1 and Example 1 is that the polycarbonate was replaced with humic acid-modified peanut shell powder prepared by the same method as in Preparation Example 8 in the nylon nucleating agent.

[0073] Comparative Example 2

[0074] The difference between Comparative Example 2 and Example 1 is that the humic acid-modified peanut shell powder in the nylon nucleating agent was replaced with polycarbonate prepared by the same method as in Example 1.

[0075] Comparative Example 3

[0076] The difference between Comparative Example 3 and Example 1 is that unmodified peanut shell powder was used instead of humic acid-modified peanut shell powder.

[0077] Comparative Example 4

[0078] The difference between Comparative Example 4 and Example 1 is that the polycarbonate was prepared by the preparation method of Preparation Example 6.

[0079] Comparative Example 5

[0080] The difference between Comparative Example 5 and Example 1 is that the polycarbonate was prepared by the preparation method of Preparation Example 7.

[0081] Comparative Example 6

[0082] The difference between Comparative Example 6 and Example 1 is that the humic acid modified peanut shell powder prepared by the preparation method of Preparation Example 12 replaces the fulvic acid modified peanut shell powder.

[0083] Comparative Example 7

[0084] The difference between Comparative Example 7 and Example 1 is that the fulvic acid modified walnut shell powder prepared by the preparation method of Preparation Example 13 is used instead of the fulvic acid modified peanut shell powder.

[0085] Application Example 1-10 and Comparison with Application Example 1-7

[0086] Nylon resin (PA6, Baling Petrochemical) was dried in a vacuum oven at 80°C for 24 hours. It was then mixed with the nylon nucleating agents prepared in Examples 1-10 and Comparative Examples 1-7 at a weight ratio of 98:2 in a high-speed mixer for 1 minute. The mixture was then co-blended and granulated using a twin-screw extruder (length-to-diameter ratio 30:1, diameter 25mm). The extruder sections were heated to 230°C, 235°C, 235°C, 235°C, 230°C, and 220°C. After cooling, the mixture was injection molded to produce standard test strips.

[0087] Test 1:

[0088] The standard splines obtained from the application examples and comparative application examples were tested for bending performance according to the ISO 178 test standard. The results are shown in Table 1 below:

[0089] Table 1

[0090]

[0091]

[0092] Comparing Application Examples 1 and 2 with Application Example 1, and referring to Table 1, it can be seen that when humic acid-modified peanut shell powder or polycarbonate is used alone as the nylon nucleating agent, the flexural modulus of the resulting modified nylon resin is significantly reduced.

[0093] Comparing Application Example 3 with Application Example 1, as shown in Table 1, when the peanut shell powder is not modified, the flexural modulus of the resulting modified nylon resin is significantly reduced.

[0094] Comparing Application Examples 4 and 5 with Application Example 1, and referring to Table 1, it can be seen that when preparing polycarbonate, if only bisphenol A and monomer 4-fluoro-3-hydroxybenzyl alcohol or bisphenol A and monomer 2-hydroxy-4-fluorobenzyl alcohol are used as monomer raw materials, the flexural modulus of the obtained modified nylon resin is significantly reduced.

[0095] Comparing Application Example 6 with Application Example 1, and referring to Table 1, it can be seen that when humic acid is replaced by an equal amount of humic acid in the preparation of fulvic acid-modified peanut shell powder, the flexural modulus of the resulting modified nylon resin is significantly reduced.

[0096] Comparing Application Example 7 with Application Example 1, and referring to Table 1, it can be seen that when humic acid-modified peanut shell powder is prepared, replacing peanut shell powder with walnut shell powder of equal mass significantly reduces the flexural modulus of the resulting modified nylon resin.

[0097] Test 2:

[0098] Aging tests were conducted according to GB / T16422.2-1999 standard. Conditions: 1. Irradiance cycle: irradiance 0.51 W / (m²) 2 .nm)(340nm); Black mark temperature 65℃; Chamber temperature 38℃; Relative humidity 50%; Time 102min; 2. Irradiation + spray cycle: Irradiance 0.51W / (m 2 (nm)(340nm); Black mark temperature 65℃; Chamber temperature 38℃; Relative humidity 50%; Time 18min. A total of 1000 hours of aging was performed. The flexural modulus after aging was measured in some application examples and comparative application examples, and the flexural modulus reduction rate was calculated as follows: Flexural modulus reduction rate = (Flexural modulus before aging - Flexural modulus after aging) / Flexural modulus before aging. The results are shown in Table 2 below.

[0099] Table 2

[0100]

[0101] Comparing Application Examples 1 and 2 with Application Example 1, and referring to Table 2, it can be seen that when fulvic acid-modified peanut shell powder or polycarbonate is used alone as the nylon nucleating agent, the flexural modulus of the resulting modified nylon resin decreases more rapidly.

[0102] Comparing Application Example 3 with Application Example 1, and referring to Table 2, it can be seen that when the peanut shell powder is not modified, the flexural modulus of the resulting modified nylon resin decreases more rapidly.

[0103] Comparing Application Examples 4 and 5 with Application Example 1, and referring to Table 2, it can be seen that when preparing polycarbonate, if only bisphenol A and monomer 4-fluoro-3-hydroxybenzyl alcohol or bisphenol A and monomer 2-hydroxy-4-fluorobenzyl alcohol are used as monomer raw materials, the flexural modulus of the resulting modified nylon resin decreases more rapidly.

[0104] Comparing Application Example 6 with Application Example 1 and referring to Table 2, it can be seen that when humic acid is replaced by an equal amount of humic acid in the preparation of fulvic acid-modified peanut shell powder, the flexural modulus of the resulting modified nylon resin decreases by a larger rate.

[0105] Comparing Application Example 7 with Application Example 1 and referring to Table 2, it can be seen that when humic acid modified peanut shell powder is prepared, replacing peanut shell powder with walnut shell powder of the same mass results in a greater decrease in the flexural modulus of the obtained modified nylon resin.

[0106] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention, all of which should be included within the protection scope of the present invention.

Claims

1. A nylon nucleating agent, characterized in that, It comprises 50-65 parts by weight of polycarbonate and 35-50 parts by weight of humic acid-modified peanut shell powder; the raw materials for preparing the polycarbonate include bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol, wherein the molar ratio of bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol is (0.8-1.2):(0.15-0.35):(0.15-0.35).

2. The nylon nucleating agent according to claim 1, characterized in that, In the raw materials for preparing the polycarbonate, the molar ratio of the sum of the molar amounts of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol to the molar amount of bisphenol A is 0.3-0.7:0.8-1.

2.

3. The nylon nucleating agent according to claim 1, characterized in that, In the raw materials for preparing the polycarbonate, the molar ratio of 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol is 0.66-1.5:

1.

4. The nylon nucleating agent according to claim 1, characterized in that, The preparation method of the fulvic acid modified peanut shell powder includes: adding fulvic acid and peanut shell powder to an organic solvent, mixing evenly, adding p-toluenesulfonic acid, heating to react, cooling, filtering, washing the filter residue, and drying to obtain the fulvic acid modified peanut shell powder.

5. The nylon nucleating agent according to claim 4, characterized in that, The mass ratio of fulvic acid to peanut shell powder is 0.375-0.6:

1.

6. The nylon nucleating agent according to claim 4, characterized in that, The peanut shell powder is a modified peanut shell powder. The preparation method of the modified peanut shell powder includes: soaking the peanut shell powder in an alkaline solution, filtering, washing the filter residue, and drying to obtain the modified peanut shell powder.

7. The nylon nucleating agent according to claim 1, characterized in that, The method for preparing the polycarbonate includes: using bisphenol A, 4-fluoro-3-hydroxybenzyl alcohol and 2-hydroxy-4-fluorobenzyl alcohol as comonomers, the polycarbonate is prepared by the phosgene method.

8. A modified nylon resin, characterized in that, It comprises 97-99 parts by weight of nylon resin and 1-3 parts by weight of the nylon nucleating agent according to any one of claims 1-7.

9. The modified nylon resin according to claim 8, characterized in that, The nylon resin is at least one of PA6, PA66, PA11, PA12, PA46, PA610, PA612 and PA1010.

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