Antioxidant amino molding plastic and preparation method thereof

Abstract

The invention discloses an antioxidant amino molding compound and a preparation method thereof, belongs to the technical field of amino molding compounds, and aims to solve the technical problems that the amino molding compound prepared in the prior art is poor in mechanical property and oxidation resistance, and a micromolecular antioxidant is easy to migrate. The invention relates to an antioxidant amino molding plastic, which comprises a composite antioxidant, a modified amino molding plastic and polyamide-imide, the composite antioxidant is obtained by carrying out addition polymerization on tert-butylhydroquinone, butylated hydroxycresol and formaldehyde; wherein the modified amino molding plastic is obtained by blending urea-formaldehyde resin and polymerized powder and carrying out mold pressing; wherein the polymerized powder is obtained by blending and drying inorganic mixed powder, a coupling agent mixed solution and a polymer emulsion; the polymer emulsion is obtained by polymerizing polyethylene glycol monomethyl ether methacrylate by taking cyclohexane as a framework. The amino molding plastic prepared by the invention has the advantages of high comprehensive mechanical strength and strong oxidation resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of amino molding compounds, and in particular to an antioxidant amino molding compound and a preparation method thereof. Background Art

[0002] Amino molding plastic is a thermosetting plastic made of corresponding resin as matrix and various additives. As an important thermosetting plastic, amino molding plastic is widely used in electronics, electrical appliances, automobiles, toys, daily necessities and other fields. With the shortage of petroleum raw materials and the enhancement of people's environmental awareness, the development of high-performance amino molds has become one of the research hotspots of scientific and technological workers.

[0003] Patent application CN117050440A discloses a modified amino molding compound and its preparation method. Lignin particles, modified amino molding fibers, and inorganic fillers are mixed, then relevant additives and polyvinyl chloride are added, and the mixture is extruded and granulated to produce the modified amino molding compound. This invention utilizes polyvinyl alcohol, urea, and zinc dimethacrylate to compositely modify melamine-formaldehyde resin, thereby improving the mechanical properties of the amino molding compound. However, compared to inorganic materials, organic materials do not significantly enhance the mechanical properties of amino molding compounds.

[0004] Furthermore, during the synthesis of amino molding compounds, an appropriate amount of antioxidants is often added to further extend the service life of the resulting amino molding compounds. Amino molding compounds often utilize small molecule antioxidants, such as phenolic antioxidants, amine antioxidants, and phosphite antioxidants. However, these small molecule antioxidants are susceptible to migration when used in amino molding compounds, shortening their service life and potentially impacting human health when in contact with skin. Therefore, further addressing the migration issues of antioxidants used in amino molding compounds and enhancing their antioxidant properties are pressing technical challenges.

[0005] In view of the technical defects in this aspect, a solution is now proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide an antioxidant amino molding compound and a preparation method thereof, which are used to solve the technical problems of poor mechanical properties, poor oxidation resistance and easy migration of small molecule antioxidants in the preparation of amino molding compounds in the prior art.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] An antioxidant amino molding compound, comprising, by weight, 5-15 parts of a composite antioxidant, 80-90 parts of a modified amino molding compound, and 5-10 parts of a polyamide-imide;

[0009] The composite antioxidant is obtained by polyaddition of tert-butylhydroquinone, dibutylhydroxy-p-cresol and formaldehyde;

[0010] The modified amino molding compound is obtained by blending and molding urea-formaldehyde resin and polymer powder; wherein the polymer powder is obtained by blending and drying inorganic mixed powder, coupling agent mixed liquid and polymer emulsion; wherein the polymer emulsion uses cyclohexane as a skeleton and is obtained by polymerizing polyethylene glycol monomethyl ether methacrylate.

[0011] Furthermore, the preparation method of the composite antioxidant comprises the following steps:

[0012] A1, tert-butylhydroquinone and dibutylhydroxy-p-cresol are dissolved in ethanol, and then sodium chloride is added to obtain a reaction system; the reaction system is then cooled to 0-5°C;

[0013] A2. Add formaldehyde dropwise to the reaction system. After the addition is complete, heat the system to 55-65°C for polymerization for 2-3 hours, then heat the system to 110-115°C for dehydration to synthesize a polymer, which is a composite antioxidant.

[0014] With sodium chloride as a porogen, tert-butylhydroquinone, dibutylhydroxy-p-cresol and formaldehyde undergo polymerization reaction to obtain a composite antioxidant.

[0015] The reaction formula for synthesizing the composite antioxidant by reacting tert-butylhydroquinone, dibutylhydroxy-p-cresol and formaldehyde is as follows:

[0016]

[0017] Furthermore, in step A1, the usage ratio of tert-butylhydroquinone, dibutylhydroxy-p-cresol, ethanol and sodium chloride is 16.6-33.2 g:11-22 g:200 mL:3-5 g; and in step A2, the usage ratio of the reaction system and formaldehyde is 225 mL:15-25 g.

[0018] Furthermore, the preparation method of the modified amino molding compound comprises the following steps:

[0019] B1, polyethylene glycol monomethyl ether methacrylate, N,N'-methylenebisacrylamide, hydroxyethyl cellulose and potassium persulfate are mixed to obtain reactant A; cyclohexane and sorbitol are mixed to obtain reactant B; reactant A is added to reactant B, and the mixture is heated to 65-75°C and reacted for 1-2 hours to obtain a polymer emulsion;

[0020] Polyethylene glycol monomethyl ether methacrylate was used as monomer, potassium persulfate as initiator, sorbitol as cross-linking agent and cyclohexane as skeleton to synthesize polymer emulsion.

[0021] B2. Mix and grind aluminum hydroxide, calcium carbonate and wollastonite to obtain an inorganic mixed powder;

[0022] B3, methacryloyl chloride propyl trichlorosilane and deionized water are mixed to obtain a coupling agent mixture; the inorganic mixed powder and the coupling agent mixture are mixed to obtain a modified inorganic mixture; the modified inorganic mixture is added to the polymer emulsion to obtain a modified polymer emulsion;

[0023] B4. The modified polymer emulsion is dried and crushed into polymer powder; the polymer powder and urea-formaldehyde resin are added into a crusher and blended to obtain a blend; the blend is compression molded to synthesize a modified amino molding compound.

[0024] The inorganic mixed powder is modified with a coupling agent to synthesize a modified inorganic mixture. The modified inorganic mixture is blended with a polymer emulsion, dried, and pulverized to synthesize a polymer powder. The polymer powder is then blended with a urea-formaldehyde resin by compression molding to produce a modified amino molding compound.

[0025] Furthermore, in step B1, the usage ratio of polyethylene glycol monomethyl ether methacrylate, N,N'-methylenebisacrylamide, hydroxyethyl cellulose and potassium persulfate is

[0026] 40-50g:0.01-0.02g:0.5-1g:0.2-0.3g; the dosage ratio of cyclohexane and sorbitol is 120-135g:0.5-0.6g; the dosage ratio of reactant B and reactant A is 120-130g:40-50g.

[0027] Furthermore, in step B2, the mass ratio of aluminum hydroxide, calcium carbonate and wollastonite is 1-2:1:1; in step B3, the amount ratio of methacryloylpropyltrichlorosilane and deionized water is 5-15g:100mL; the amount ratio of the inorganic mixed powder and the coupling agent mixed solution is 10-20g:10-20mL; the amount ratio of the modified inorganic mixture and the polymer emulsion is 15-25mL:100g.

[0028] Furthermore, in step B4, the crushed particle size is 120-125 μm, the weight ratio of the polymer powder to the urea-formaldehyde resin is 5-10:70-80; the molding temperature is 155-160° C., and the molding pressure is 35-45 MPa.

[0029] As another aspect of the present invention, a method for preparing an antioxidant amino molding compound comprises the following steps:

[0030] The composite antioxidant, modified amino molding plastic and polyamide-imide are mixed to obtain a mixture; the mixture is added into a mixer for melt blending to synthesize the antioxidant amino molding plastic.

[0031] Furthermore, the melt blending temperature is 160-180° C., and the melt blending time is 10-15 minutes.

[0032] The present invention has the following beneficial effects:

[0033] 1. The present invention mixes and melt-blends a composite antioxidant, a modified amino molding compound, and polyamide-imide to synthesize an antioxidant amino molding compound. Adding an appropriate amount of polyamide-imide can improve the mechanical properties and dimensional stability of the amino molding compound and reduce its shrinkage. The addition of the composite antioxidant improves the oxidation resistance of the molding compound, while the modified amino molding compound enhances its overall mechanical strength. Furthermore, the antioxidant amino molding compound prepared by the present invention exhibits a high degree of compatibility among its components.

[0034] 2. Blend and melt urea-formaldehyde resin and polymer powder to prepare a matrix-modified amino molding compound. Polyethylene glycol monomethyl ether methacrylate is used as a monomer, cyclohexane is used as a skeleton, and sorbitol is used for cross-linking to synthesize a multi-porous polymer emulsion. Methacryloyl chloride propyl trichlorosilane with strong polarity and multifunctionality is selected as a coupling agent to modify the inorganic mixed powder to obtain a coupling agent-modified inorganic mixed powder; the coupling agent-modified inorganic mixed powder is blended with the above-mentioned polymer emulsion, which can be further filled into the polymer skeleton, and then subjected to a drying and crushing process to synthesize a polymer powder; the polymer powder prepared by the present invention is molded together with urea-formaldehyde resin, and the polymer powder can form a dense network structure with the urea-formaldehyde resin through a chemical reaction of organic functional groups, and the inorganic mixed powder composed of aluminum hydroxide, calcium carbonate and wollastonite is highly dispersed in the resin, thereby preparing a modified amino molding compound with high mechanical strength and strong antioxidant properties.

[0035] 3. To further enhance the antioxidant properties of the prepared amino molding compound, the present invention adds an appropriate amount of a composite antioxidant to the prepared amino molding compound. Tertiary butylhydroquinone and dibutyl hydroxy-p-cresol, as small molecule antioxidants, undergo polyaddition with formaldehyde to form a resin-like composite antioxidant with a defined pore size. This increases the molecular weight of the composite antioxidant, improving its mobility and volatility. Furthermore, the composite antioxidant exhibits enhanced antioxidant activity compared to single small molecule oxidants. DETAILED DESCRIPTION

[0036] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The polyethylene glycol monomethyl ether methacrylate used in Examples 4-6 of the present invention was purchased from Wuhan Lanabai Pharmaceutical Chemical Co., Ltd., with a product number of lnb-1021 and a molecular weight of 300; the hydroxyethyl cellulose used in Examples 4-6 of the present invention was purchased from Guangzhou Penghui Biotechnology Co., Ltd., with a model number of QP-100 and a density of 1.03 g / cm 3 ; The urea-formaldehyde resin used in Examples 4-6 of the present invention was purchased from Henan Detai Chemical Products Co., Ltd.; the aluminum hydroxide used in Examples 4-6 of the present invention was purchased from Jinan Qinghai Chemical Co., Ltd., with the brand name AH-1; the calcium carbonate used in Examples 4-6 of the present invention was purchased from Lingshou County Shuntian Mineral Products Processing Plant, with the product number ST55533; the wollastonite used in Examples 4-6 of the present invention was purchased from Lingshou County Shuolong Mineral Products Processing Plant, with the product number sl-19, and the silicon dioxide content was 50% wt; the polyamide-imide used in Examples 7-9 of the present invention was purchased from the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, with a dielectric constant of 4, a dielectric strength of 125, and a relative density of 1.41.

[0038] Example 1

[0039] This embodiment provides a method for preparing a composite antioxidant for an antioxidant amino molding compound, comprising the following steps:

[0040] A1. Add 16.6 g of tert-butylhydroquinone, 11 g of dibutylhydroxy-p-cresol, and 200 mL of ethanol to a 250 mL beaker and stir to dissolve. Then add 3 g of sodium chloride to obtain a reaction system. Transfer the reaction system to a water bath and lower the temperature of the water bath to 0°C.

[0041] A2. Measure 225 mL of the reaction system and add 15 g of formaldehyde dropwise to the reaction system. The total addition time of formaldehyde is controlled within 40 min. After the addition is completed, place the beaker in a water bath and continue to heat it to 55°C. Polymerize at this temperature for 2 h, then heat it to 110°C for dehydration to synthesize a polymer composite antioxidant.

[0042] Example 2

[0043] This embodiment provides a method for preparing a composite antioxidant for an antioxidant amino molding compound, comprising the following steps:

[0044] A1. Add 25 g of tert-butylhydroquinone, 16.5 g of dibutylhydroxy-p-cresol, and 200 mL of ethanol to a 250 mL beaker and stir to dissolve. Then add 4 g of sodium chloride to prepare a reaction system. Transfer the reaction system to a water bath and lower the temperature to 3°C.

[0045] A2. Measure 225 mL of the reaction system and add 20 g of formaldehyde dropwise to the reaction system. The total addition time of formaldehyde is controlled to be 45 min. After the addition is completed, place the beaker in a water bath and continue to heat it to 60°C. Polymerize at this temperature for 2.5 h, then heat it to 115°C for dehydration to synthesize a polymer composite antioxidant.

[0046] Example 3

[0047] This embodiment provides a method for preparing a composite antioxidant for an antioxidant amino molding compound, comprising the following steps:

[0048] A1. Add 33.2 g of tert-butylhydroquinone, 22 g of dibutylhydroxy-p-cresol, and 200 mL of ethanol to a 250 mL beaker and stir to dissolve. Then, add 5 g of sodium chloride to prepare a reaction system. Transfer the reaction system to a water bath and lower the temperature to 5°C.

[0049] A2. Measure 225 mL of the reaction system and add 25 g of formaldehyde dropwise to the reaction system. The total addition time of formaldehyde is controlled within 50 min. After the addition is completed, place the beaker in a water bath and continue to heat it to 65°C. Polymerize at this temperature for 3 h, then heat it to 115°C for dehydration to synthesize a polymer composite antioxidant.

[0050] Example 4

[0051] This embodiment provides a method for preparing a modified amino molding compound for use in an antioxidant amino molding compound, comprising the following steps:

[0052] B1. Add 40 g of polyethylene glycol monomethyl ether methacrylate, 0.01 g of N,N'-methylenebisacrylamide, 0.5 g of hydroxyethyl cellulose, and 0.2 g of potassium persulfate to a reactor and mix well to obtain reactant A. In another 250 mL four-necked flask, add 120 g of cyclohexane and 0.5 g of sorbitol to obtain reactant B. Add 40 g of reactant A to 120 g of reactant B, then raise the temperature to 65°C and react for 1 hour to obtain a polymer emulsion.

[0053] B2, aluminum hydroxide, calcium carbonate and wollastonite are mixed in a mass ratio of 1:1:1 to obtain an inorganic mixture; the inorganic mixture is ground to 200 mesh to obtain an inorganic mixed powder.

[0054] B3. Mix 5 g of methacryloyl chloride propyl trichlorosilane and 100 mL of deionized water to obtain a coupling agent mixture; mix 10 g of the inorganic mixed powder and 10 mL of the coupling agent mixture to obtain a modified inorganic mixture; add 15 mL of the modified inorganic mixture to 100 g of the polymer emulsion to obtain a modified polymer emulsion.

[0055] B4. Dry the modified polymer emulsion and grind it into a polymer powder of 120 μm; add 5 parts of polymer powder and 70 parts of urea-formaldehyde resin into a universal grinder and blend them according to weight to obtain a blend; add the blend into a mold and perform compression molding to synthesize a modified amino molding compound; wherein the molding temperature is 155° C. and the molding pressure is 35 MPa.

[0056] Example 5

[0057] This embodiment provides a method for preparing a modified amino molding compound for use in an antioxidant amino molding compound, comprising the following steps:

[0058] B1. Add 45 g of polyethylene glycol monomethyl ether methacrylate, 0.015 g of N,N'-methylenebisacrylamide, 0.8 g of hydroxyethyl cellulose, and 0.25 g of potassium persulfate to a reactor and mix thoroughly to obtain reactant A. In another 250 mL four-necked flask, add 130 g of cyclohexane and 0.55 g of sorbitol to obtain reactant B. Add reactant A to reactant B, then raise the temperature to 70°C and react for 1.5 hours to obtain a polymer emulsion.

[0059] B2, aluminum hydroxide, calcium carbonate and wollastonite are mixed in a mass ratio of 1:1:1 to obtain an inorganic mixture; the inorganic mixture is ground to 220 mesh to obtain an inorganic mixed powder.

[0060] B3. Mix 10 g of methacryloyl chloride propyltrichlorosilane and 100 mL of deionized water to obtain a coupling agent mixture; mix 15 g of the inorganic mixed powder and 15 mL of the coupling agent mixture to obtain a modified inorganic mixture; add 20 mL of the modified inorganic mixture to 100 g of the polymer emulsion to obtain a modified polymer emulsion.

[0061] B4. Dry the modified polymer emulsion and grind it into a polymer powder of 120 μm; add 8 parts of the polymer powder and 78 parts of urea-formaldehyde resin into a universal grinder and blend them, based on parts by weight, to obtain a blend; add the blend into a two-roll mixer and melt blend at a temperature of 160° C. for 15 minutes to obtain an antioxidant amino molding compound.

[0062] Example 6

[0063] This embodiment provides a method for preparing a modified amino molding compound for use in an antioxidant amino molding compound, comprising the following steps:

[0064] B1. Add 50 g of polyethylene glycol monomethyl ether methacrylate, 0.02 g of N,N'-methylenebisacrylamide, 1 g of hydroxyethyl cellulose, and 0.3 g of potassium persulfate to a reactor and mix thoroughly to obtain reactant A. In another 250 mL four-necked flask, add 135 g of cyclohexane and 0.6 g of sorbitol to obtain reactant B. Add reactant A to reactant B, then raise the temperature to 75°C and react for 2 hours to obtain a polymer emulsion.

[0065] B2, aluminum hydroxide, calcium carbonate and wollastonite are mixed in a mass ratio of 2:1:1 to obtain an inorganic mixture; the inorganic mixture is ground to 300 mesh to obtain an inorganic mixed powder.

[0066] B3. Mix 15 g of methacryloyl chloride propyl trichlorosilane and 100 mL of deionized water to obtain a coupling agent mixture; mix 20 g of the inorganic mixed powder and 20 mL of the coupling agent mixture to obtain a modified inorganic mixture; add 25 mL of the modified inorganic mixture to 100 g of the polymer emulsion to obtain a modified polymer emulsion.

[0067] B4. Dry the modified polymer emulsion and grind it into a polymer powder of 125 μm; add 10 parts of the polymer powder and 80 parts of urea-formaldehyde resin into a universal grinder and blend them according to parts by weight to obtain a blend; add the blend into a two-roll mixer and melt blend at a temperature of 175° C. for 12 minutes to obtain an antioxidant amino molding compound.

[0068] Example 7

[0069] This embodiment provides a method for preparing an antioxidant amino molding compound, comprising the following steps:

[0070] S1. Add 5 parts by weight of the composite antioxidant prepared in Example 1, 90 parts of the modified amino molding compound prepared in Example 4, and 5 parts of polyamide-imide to a high-speed mixer and disperse at 200 rpm for 5 minutes to obtain a mixture. Add the mixture to a two-roll mixer and melt blend at 160° C. for 10 minutes to obtain an antioxidant amino molding compound.

[0071] Example 8

[0072] This embodiment provides a method for preparing an antioxidant amino molding compound, comprising the following steps:

[0073] S1. Add 10 parts by weight of the composite antioxidant prepared in Example 2, 85 parts of the modified amino molding compound prepared in Example 5, and 8 parts of polyamide-imide to a high-speed mixer and disperse at 300 rpm for 8 minutes to obtain a mixture. Add the mixture to a two-roll mixer and melt blend at 170°C for 12 minutes to obtain an antioxidant amino molding compound.

[0074] Example 9

[0075] This embodiment provides a method for preparing an antioxidant amino molding compound, comprising the following steps:

[0076] S1. Add 15 parts by weight of the composite antioxidant prepared in Example 3, 90 parts of the modified amino molding compound prepared in Example 6, and 10 parts of polyamide-imide to a high-speed mixer and disperse at 500 rpm for 10 minutes to obtain a mixture. Add the mixture to a two-roll mixer and melt blend at 180°C for 15 minutes to obtain an antioxidant amino molding compound.

[0077] Comparative Example 1

[0078] The difference between this comparative example and Example 9 is that tert-butylhydroquinone is used to replace the composite antioxidant of equal mass.

[0079] Comparative Example 2

[0080] The difference between this comparative example and Example 9 is that, when synthesizing the modified amino molding compound, in step B1, when synthesizing the polymer emulsion, no sorbitol was added.

[0081] Comparative Example 3

[0082] The difference between this comparative example and Example 9 is that, when synthesizing the coupling agent mixture, methylethyltriethoxysilane of equal mass is used instead of methacryloylchloropropyltrichlorosilane.

[0083] Performance testing:

[0084] 1. According to GB13454-92 "Amino Film Plastics", the molding shrinkage of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 was tested in turn.

[0085] 2. According to GB9341-2008 “Flexural Properties of Plastics”, the flexural strength of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 was tested in turn.

[0086] 3. According to GB1043 "Plastics Charpy Impact Test Method", the notched impact strength of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 was tested in turn.

[0087] 4. The storage modulus of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 at 25° C. was tested in turn.

[0088] 5. Using a thermal analyzer, 20 mg of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 were weighed and analyzed for thermal stability; wherein, the heating rate was 10°C / min, and the temperature was raised to 250°C, and the weight loss rate was measured.

[0089] 6. The antioxidant performance of the antioxidant amino molding compounds prepared in Examples 7-9 and Comparative Examples 1-3 was tested using a DPPH free radical scavenging experiment, and their free radical scavenging activities were calculated.

[0090] The specific test results are shown in Table 1.

[0091] Table 1. Performance test data of samples

[0092]

[0093]

[0094] Data Analysis: Analysis of the data in Table 1 shows that the antioxidant amino molding compounds prepared in Examples 7-9 of the present invention all exhibit high mechanical properties, as evidenced by high flexural strength and notched impact strength. However, in Comparative Example 2, the modified amino molding compound was synthesized without the addition of the crosslinking agent sorbitol during the polymer emulsion synthesis. This resulted in a lower degree of crosslinking between the prepared polymer powder and the urea-formaldehyde resin, and poorer dispersibility of the inorganic mixed powder in the urea-formaldehyde resin. This resulted in poorer mechanical properties of the modified amino molding compound, as evidenced by lower flexural strength and notched impact strength. Furthermore, the storage modulus of the modified amino molding compound prepared in Comparative Example 2 was significantly reduced.

[0095] In Comparative Example 3, methylethyltriethoxysilane, which has lower polarity and fewer functional groups, is used to replace methylacryloylchloropropyltrichlorosilane; the compatibility of the modified inorganic mixture with the polymer emulsion is even worse, which further reduces the flexural strength and notched impact strength of the prepared modified amino molding compound;

[0096] The antioxidant amino film plastics prepared in Examples 7-9 of the present invention have high thermal stability, as evidenced by the weight loss rates of the prepared amino molding compounds at 250°C not exceeding 40%. However, the antioxidant amino molding compounds synthesized in Comparative Examples 2 and 3 both had weight loss rates exceeding 40%.

[0097] In Comparative Example 1, a single tert-butylhydroquinone was used to replace an equal mass of composite antioxidant. The composite antioxidant, which polymerized the two antioxidants in a resin-like form, enhanced antioxidant properties. Furthermore, the type of antioxidant added did not significantly affect the mechanical properties, impact strength, storage modulus, weight loss rate, or thermal stability of the prepared amino molding compound.

[0098] The above contents are merely examples and explanations of the structure of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they shall fall within the scope of protection of the present invention.

[0099] Throughout this specification, references to terms such as "one embodiment," "example," and "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0100] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An antioxidant amino molding compound, characterized in that: The composition comprises 5-15 parts of a composite antioxidant, 80-90 parts of a modified amino molding compound, and 5-10 parts of a polyamide-imide, in parts by weight; The composite antioxidant is obtained by polyaddition of tert-butylhydroquinone, dibutylhydroxy-p-cresol and formaldehyde; The modified amino molding compound is obtained by blending and molding urea-formaldehyde resin and polymer powder; wherein the polymer powder is obtained by blending and drying inorganic mixed powder, coupling agent mixed liquid and polymer emulsion; wherein the polymer emulsion uses cyclohexane as a skeleton and is obtained by polymerizing polyethylene glycol monomethyl ether methacrylate.

2. The antioxidant amino molding compound according to claim 1, characterized in that: The preparation method of the composite antioxidant comprises the following steps: A1, tert-butylhydroquinone and dibutylhydroxy-p-cresol are dissolved in ethanol, and then sodium chloride is added to obtain a reaction system; the reaction system is then cooled to 0-5°C; A2. Add formaldehyde dropwise to the reaction system. After the addition is complete, heat the system to 55-65°C for polymerization for 2-3 hours, then heat the system to 110-115°C for dehydration to synthesize a polymer composite antioxidant.

3. The antioxidant amino molding compound according to claim 2, characterized in that: In step A1, the ratio of tert-butylhydroquinone, dibutylhydroxy-p-cresol, ethanol and sodium chloride is 16.6-33.2 g:11-22 g:200 mL:3-5 g; in step A2, the ratio of the reaction system to formaldehyde is 225 mL:15-25 g.

4. The antioxidant amino molding compound according to claim 1, characterized in that: The preparation method of the modified amino molding compound is characterized by comprising the following steps: B1, polyethylene glycol monomethyl ether methacrylate, N,N'-methylenebisacrylamide, hydroxyethyl cellulose and potassium persulfate are mixed to obtain reactant A; cyclohexane and sorbitol are mixed to obtain reactant B; reactant A is added to reactant B, and the mixture is heated to 65-75°C and reacted for 1-2 hours to obtain a polymer emulsion; B2. Mix and grind aluminum hydroxide, calcium carbonate and wollastonite to obtain an inorganic mixed powder; B3, methacryloyl chloride propyl trichlorosilane and deionized water are mixed to obtain a coupling agent mixture; the inorganic mixed powder and the coupling agent mixture are mixed to obtain a modified inorganic mixture; the modified inorganic mixture is added to the polymer emulsion to obtain a modified polymer emulsion; B4. The modified polymer emulsion is dried and crushed into a polymer powder; the polymer powder and urea-formaldehyde resin are added into a crusher and blended to obtain a blend; the blend is compression molded to synthesize a modified amino molding compound.

5. The antioxidant amino molding compound according to claim 4, characterized in that: In step B1, the amount ratio of polyethylene glycol monomethyl ether methacrylate, N,N'-methylenebisacrylamide, hydroxyethyl cellulose and potassium persulfate is 40-50g:0.01-0.02g:0.5-1g:0.2-0.3g; the amount ratio of cyclohexane and sorbitol is 120-135g:0.5-0.6g; the amount ratio of reactant B to reactant A is 120-130g:40-50g.

6. The antioxidant amino molding compound according to claim 4, characterized in that: In step B2, the mass ratio of aluminum hydroxide, calcium carbonate and wollastonite is 1-2:1:1; in step B3, the amount ratio of methacryloylchloropropyltrichlorosilane and deionized water is 5-15g:100mL; the amount ratio of the inorganic mixed powder and the coupling agent mixed solution is 10-20g:10-20mL; the amount ratio of the modified inorganic mixture and the polymer emulsion is 15-25mL:100g.

7. The antioxidant amino molding compound according to claim 4, characterized in that: In step B4, the crushed particle size is 120-125 μm, the weight ratio of the polymer powder to the urea-formaldehyde resin is 5-10:70-80; the molding temperature is 155-160° C., and the molding pressure is 35-45 MPa.

8. A method for preparing an antioxidant amino molding compound according to any one of claims 1 to 7, characterized in that: The following steps are involved: The composite antioxidant, modified amino molding plastic and polyamide-imide are mixed to obtain a mixture; the mixture is added into a mixer for melt blending to synthesize the antioxidant amino molding plastic.

9. The method for preparing an antioxidant amino molding compound according to claim 8, characterized in that: The temperature of the melt blending is 160-180°C, and the time of the melt blending is 10-15 minutes.

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