A high-performance ABS modified material and its production process

Abstract

The present invention discloses a high-performance ABS modified material and a production process thereof, comprising the following steps: step (1), preparing an active substance B; step (2), modifying the active substance B to obtain a functional filler; step (3), using the functional filler as a core for a polymerization reaction to obtain a functional component; step (4), preparing a copolymer C through acrylonitrile monomer and styrene monomer; step (5), mixing the functional component and the copolymer C, adding a lubricant, melt-kneading through a twin-screw extruder, extruding and pelletizing to obtain an ABS modified material. This scheme belongs to the field of functional plastics. By modifying the functional filler and adding it to the high-performance ABS modified material preparation process in the form of a polymer core, the high-performance ABS modified material has high oxidation resistance, electromagnetic shielding effect, and mechanical properties.

Description

Technical Field

[0001] The present invention relates to the field of functional plastics, and in particular to a high-performance ABS modified material and a production process thereof. Background Art

[0002] ABS material has high mechanical strength and a high operating temperature. It can be processed and formed through various methods such as injection molding and extrusion molding. It has high corrosion resistance and is widely used in industries such as automobiles, electronics, toys, and household appliances. In terms of electromagnetic shielding, ABS is given the ability to shield electromagnetic interference by adding conductive fillers (such as carbon black, carbon fiber, metal powder, or metal fiber), thereby transforming it into a functional plastic that can be used in electronic equipment, the automotive industry, communications equipment, household appliances, etc., helping to reduce electromagnetic radiation and protect user health. However, the addition of conductive fillers can easily lead to a decrease in its performance. Long-term exposure to ultraviolet light, high temperatures, or contact with acids / solvents can also cause ABS to undergo oxidative degradation, thermal aging, or chemical corrosion, leading to cracking and failure.

[0003] CN115109381 A discloses an ABS composite material with electromagnetic shielding properties and its preparation method. The ABS composite material with electromagnetic shielding properties comprises the following components by weight: 80-120 parts ABS resin; 10-20 parts glass fiber; 5-10 parts electromagnetic shielding agent; 0.2-1 part coupling agent; and 1-3 parts lubricant. The electromagnetic shielding agent is made from carbon nanotubes and tungsten powder. By incorporating an electromagnetic shielding agent prepared using a novel method, the resulting ABS composite material exhibits excellent electromagnetic shielding properties. CN101812214A relates to an electromagnetic shielding material and its preparation method. The electromagnetic shielding material is prepared by pre-treating ABS plastic and ABS plasticizer by mixing and heating. Conductive carbon black, magnetic powder, and carbon fibers are then added and mixed uniformly in a high-speed mixer. The mixture is then extruded in a twin-screw extruder and granulated to produce the electromagnetic shielding material of the present invention. This material exhibits excellent electromagnetic wave radiation protection and can be applied to power, wireless communications, household appliances, and military applications. The above methods all focus on the electromagnetic shielding performance, but do not consider the service and failure issues of ABS. Summary of the Invention

[0004] To address the above-mentioned problems, the present invention proposes a high-performance ABS modified material and a production process thereof. By modifying a functional filler and adding it to the preparation process of the high-performance ABS modified material in the form of a polymer core, the high-performance ABS modified material has high oxidation resistance, electromagnetic shielding effect and mechanical properties.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A production process for high-performance ABS modified material comprises the following steps:

[0007] Step (1): adding 0.1 to 1 parts of tetrabutyl titanate by weight to an ethanol aqueous solution having a mass concentration of 10% to 20%, and uniformly dispersing the mixture to obtain liquid A; taking 10 to 20 parts of liquid A, adding 10 to 20 parts of soft magnetic powder particles, and then adding hydrochloric acid to adjust the pH to 5 to 7, hydrolyzing the mixture for 5 to 8 hours, drying the mixture, calcining the mixture at 550 to 650° C. for 1 to 2 hours, cooling the mixture to room temperature, and heat-treating the mixture at 120 to 150° C. for 0.5 to 1 hour, and dispersing the mixture to obtain active material B;

[0008] Step (2): adding 10 to 20 parts of active material B and 0.3 to 0.5 parts of silane coupling agent to 10 to 15 parts of 10% to 20% ethanol aqueous solution by weight, adjusting the pH to 5 to 6 with carboxylic acid, stirring for 30 to 60 minutes, centrifuging to obtain a solid phase, and drying to obtain a functional filler;

[0009] Step (3): Dispersing 3 to 5 parts of functional filler in 30 to 40 parts of butadiene monomer in an emulsion by weight, adding 0.15 to 0.5 parts of initiator A, polymerizing at 600 to 800 r / min and 50 to 80° C. for 2 to 3 hours, then adding 5 to 10 parts of styrene monomer and 5 to 10 parts of acrylonitrile monomer, and then adding 0.05 to 0.1 parts of initiator B, reacting at 400 to 800 r / min and 60 to 80° C. for 5 to 10 hours to obtain a functional component;

[0010] Step (4): adding 10 to 15 parts of acrylonitrile monomer and 15 to 20 parts of styrene monomer to 50 to 80 parts of acetone solution having a mass concentration of 5% to 10%, adding 0.1 to 0.15 parts of initiator C and 0.1 to 0.3 parts of emulsifier, and reacting at 600 to 800 r / min and 65° C. to 80° C. for 4 to 6 hours to obtain copolymer C;

[0011] Step (5): by weight, 10 to 20 parts of functional components and 15 to 30 parts of copolymer C are mixed, 0.1 to 0.3 parts of demulsifier are added, and the mixture is reacted at 200 r / min to 300 r / min and 60° C. to 80° C. for 2 to 3 hours, followed by washing and drying, and 0.1 to 1 part of lubricant is added. The mixture is melt-kneaded through a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0012] This solution has the following features:

[0013] 1. This solution uses titanium dioxide modified soft magnetic powder particles as functional fillers, which not only play an electromagnetic shielding role, but also have an antioxidant effect. Among them, the electromagnetic shielding is mainly achieved by the soft magnetic powder particles. The electromagnetic shielding ability of soft ferrites comes from its dual characteristics of magnetic medium and dielectric, and it has both magnetic loss mechanism and electric loss mechanism. It is particularly good at suppressing high-frequency magnetic field interference. Since the addition amount is not high and it is a soft magnetic material, it does not show magnetism on a macroscopic scale. The antioxidant effect is mainly due to the fact that during step (1), after the hydrolysis of tetrabutyl titanate, titanium ions adhere to the surface of the soft magnetic powder particles. During the calcination process, titanium dioxide nanocrystals are generated on the surface of the soft magnetic powder particles. These titanium dioxide crystals form a heterojunction with the soft magnetic powder particles, namely active material B. The oxidation band of ABS resin in the environment is mainly concentrated in the ultraviolet light region of 290-400nm, while the maximum absorption wavelength of titanium dioxide is usually between 280-350nm. The heterojunction formed by this scheme can reduce the interfacial band gap, making the heterojunction structure's absorption of the ultraviolet light band wider, thereby enhancing the antioxidant ability of ABS.

[0014] 2. In order to fully disperse the active substance B in the ABS modified material, the present invention modifies the active substance B in step (2) to obtain a functional filler. In the modification process of the present invention, pH adjustment is achieved by carboxylic acid. Conventional modification uses hydrochloric acid to adjust the pH, but the presence of chloride ions can cause problems such as difficulty in ABS processing, decreased mechanical properties, and poor weather resistance. The use of carboxylic acid can allow a small amount of carboxyl groups to attach to the surface of the functional filler, thereby enhancing the interfacial compatibility between the functional filler and the butadiene monomer or polymer and reducing the activation energy of butadiene polymerization. This allows the polymerization reaction nucleation to occur primarily on the surface of the functional filler, allowing the functional filler to be coated with the butadiene polymer and further encapsulated in steps (3) and (5) and fully dispersed.

[0015] 3. In this embodiment, step (3) first prepares a functional component having a core-shell structure with a polybutadiene core encapsulating a functional filler and a styrene-acrylonitrile copolymer shell. Furthermore, step (4) prepares copolymer C, which is then polymerized with the functional component to obtain an ABS modified material. This preparation method facilitates the regulation of strength and toughness, and can better disperse the functional filler, thereby improving overall uniformity. The stirring rate is used to control the reaction progress and polymer particle size in steps (3) and (4); faster stirring results in smaller particle size.

[0016] Preferably, in step (1), the soft magnetic powder particles are soft ferrite powder particles; the average particle size of the soft ferrite powder particles is 1 μm to 2 μm.

[0017] Preferably, in step (2), the silane coupling agent is γ-aminopropyltriethoxysilane.

[0018] Preferably, in step (2), the carboxylic acid is one of formic acid, acetic acid, propionic acid, citric acid and tartaric acid.

[0019] Preferably, in step (2), the rotation speed for stirring for 30 min to 60 min is 800 r / min to 1000 r / min.

[0020] Preferably, in step (3), the initiator A is persulfate, and the initiator B is benzoyl peroxide.

[0021] Preferably, in step (4), the initiator C is azobisisobutyronitrile or azobisisobutyronitrile, and the emulsifier is sodium dodecylbenzenesulfonate.

[0022] Preferably, in step (5), the demulsifier is a polyether or quaternary ammonium salt demulsifier.

[0023] Preferably, in step (5), the drying temperature is 80° C.-120° C.; and the moisture content after drying is <0.1%.

[0024] Preferably, in step (5), the lubricant is one of zinc stearate, trihydroxystearate, paraffin or polyethylene wax.

[0025] This solution also proposes a high-performance ABS modified material prepared by the production process of the above-mentioned high-performance ABS modified material.

[0026] Compared with the existing technology, the advantages of this solution are:

[0027] 1. A heterojunction composed of titanium dioxide / soft ferrite powder particles was prepared as a functional filler, achieving good electromagnetic shielding effect and antioxidant properties.

[0028] 2. Through modification, step-by-step polymerization and other methods, the heterojunction composed of titanium dioxide / soft ferrite powder particles is well dispersed in the finished product, ensuring the stability of performance. DETAILED DESCRIPTION

[0029] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0030] Example 1

[0031] A production process for high-performance ABS modified material comprises the following steps:

[0032] Step (1): adding 0.5 parts of tetrabutyl titanate to a 10% ethanol aqueous solution by weight and uniformly dispersing the mixture to obtain liquid A; taking 15 parts of liquid A, adding 15 parts of soft ferrite powder particles with an average particle size of 1.3 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 7 hours, drying, calcining at 600° C. for 2 hours, cooling to room temperature, and heat-treating the mixture at 140° C. for 0.5 hours, and dispersing the mixture to obtain active material B;

[0033] Step (2): 15 parts of active substance B and 0.4 parts of γ-aminopropyltriethoxysilane were added to 13 parts of a 10% ethanol aqueous solution by weight, the pH was adjusted to 6 with formic acid, and the mixture was stirred at 900 rpm for 60 minutes. The solid phase was separated by centrifugation and dried to obtain a functional filler;

[0034] Step (3): Dispersing 4 parts of functional filler in 35 parts of butadiene monomer in an emulsion, adding 0.3 parts of potassium persulfate, polymerizing at 700 r / min and 70° C. for 2 h, then adding 8 parts of styrene monomer and 6 parts of acrylonitrile monomer, and then adding 0.08 parts of benzoyl peroxide, reacting at 600 r / min and 70° C. for 7 h to obtain a functional component;

[0035] Step (4): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 70 parts of 6% acetone solution by weight, adding 0.13 parts of azobisisobutyronitrile and 0.2 parts of sodium dodecylbenzenesulfonate, and reacting at 700 r / min and 65° C. to 80° C. for 5 hours to obtain copolymer C;

[0036] Step (5): 15 parts of functional components and 25 parts of copolymer C are mixed by weight, 0.2 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 250 r / min and 70° C. for 2 h, followed by washing and drying at 100° C. with a moisture content of <0.1% after drying, 0.5 parts of zinc stearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0037] Example 2

[0038] A production process for high-performance ABS modified material comprises the following steps:

[0039] Step (1): adding 0.3 parts by weight of tetrabutyl titanate to an ethanol aqueous solution having a mass concentration of 17% and uniformly dispersing the mixture to obtain liquid A; taking 12 parts of liquid A, adding 15 parts of soft ferrite powder particles having an average particle size of 1.1 μm, then adding hydrochloric acid to adjust the pH to 6, hydrolyzing the mixture for 7 hours, drying the mixture, calcining the mixture at 630° C. for 1 hour, cooling the mixture to room temperature, and then heat-treating the mixture at 130° C. for 1 hour and dispersing the mixture to obtain active material B;

[0040] Step (2): adding 20 parts by weight of active substance B and 0.5 parts of γ-aminopropyltriethoxysilane to 15 parts of a 15% ethanol aqueous solution, adjusting the pH to 6 with propionic acid, stirring at 800 rpm for 60 minutes, centrifuging to obtain a solid phase, and drying to obtain a functional filler;

[0041] Step (3): Dispersing 5 parts of functional filler in 30 parts of butadiene monomer in an emulsion, adding 0.4 parts of potassium persulfate, polymerizing at 600 r / min and 70° C. for 3 hours, then adding 10 parts of styrene monomer and 10 parts of acrylonitrile monomer, and then adding 0.05 parts of benzoyl peroxide, reacting at 500 r / min and 80° C. for 8 hours to obtain a functional component;

[0042] Step (4): adding 10 parts of acrylonitrile monomer and 15 parts of styrene monomer to 50 parts of 10% acetone solution by weight, adding 0.14 parts of azobisisobutyronitrile and 0.3 parts of sodium dodecylbenzenesulfonate, and reacting at 800 r / min and 75° C. for 6 hours to obtain copolymer C;

[0043] Step (5): 10 parts of functional components and 15 parts of copolymer C are mixed by weight, 0.1 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 200 r / min and 80° C. for 3 hours, followed by washing and drying at 120° C. with a moisture content of <0.1% after drying, 0.6 parts of glycerol trihydroxystearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0044] Example 3

[0045] A production process for high-performance ABS modified material comprises the following steps:

[0046] Step (1): adding 0.8 parts by weight of tetrabutyl titanate to a 20% ethanol aqueous solution and uniformly dispersing the mixture to obtain liquid A; taking 20 parts of liquid A, adding 20 parts of soft ferrite powder particles having an average particle size of 1.6 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 8 hours, drying the mixture, calcining the mixture at 650° C. for 2 hours, cooling the mixture to room temperature, and then heat-treating the mixture at 150° C. for 1 hour, and dispersing the mixture to obtain active material B;

[0047] Step (2): adding 10 to 20 parts of active substance B and 0.3 to 0.5 parts of γ-aminopropyltriethoxysilane to 10 to 15 parts of an ethanol aqueous solution having a mass concentration of 10% to 20%, adjusting the pH to 5 with acetic acid, stirring at 1000 rpm for 60 minutes, centrifuging to obtain a solid phase, and drying to obtain a functional filler;

[0048] Step (3): Dispersing 5 parts of functional filler in 40 parts of butadiene monomer in an emulsion, adding 0.5 parts of potassium persulfate, polymerizing at 800 r / min and 75° C. for 3 hours, then adding 10 parts of styrene monomer and 8 parts of acrylonitrile monomer, and then adding 0.08 parts of benzoyl peroxide, reacting at 700 r / min and 65° C. for 8 hours to obtain a functional component;

[0049] Step (4): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 75 parts of 8% acetone solution, adding 0.14 parts of azobisisobutyronitrile and 0.3 parts of sodium dodecylbenzenesulfonate, and reacting at 800 r / min and 80° C. for 6 hours to obtain copolymer C;

[0050] Step (5): 20 parts of functional components and 30 parts of copolymer C are mixed by weight, 0.3 parts of methyl sulfate alkyl methyl quaternary ammonium salt demulsifier are added, and the mixture is reacted at 300 r / min and 80° C. for 3 hours, followed by washing and drying at 120° C., wherein the moisture content after drying is less than 0.1%, 0.7 parts of polyethylene wax are added, and the mixture is melt-mixed by a twin-screw extruder, and pelletized after extrusion to obtain an ABS modified material.

[0051] Comparative Example 1

[0052] The difference from Example 1 is that nano titanium dioxide and soft ferrite powder particles are added separately, specifically:

[0053] Step (1): dispersing 4 parts of soft ferrite powder particles with an average particle size of 1.1 μm and 0.04 parts of nano-titanium dioxide in 35 parts of butadiene monomer in an emulsion, adding 0.3 parts of potassium persulfate, polymerizing at 700 r / min and 70° C. for 2 h, then adding 8 parts of styrene monomer and 6 parts of acrylonitrile monomer, and then adding 0.08 parts of benzoyl peroxide, reacting at 600 r / min and 70° C. for 7 h to obtain a functional component;

[0054] Step (2): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 70 parts of 6% acetone solution by weight, adding 0.13 parts of azobisisobutyronitrile and 0.2 parts of sodium dodecylbenzenesulfonate, and reacting at 700 r / min and 65° C. to 80° C. for 5 hours to obtain copolymer C;

[0055] Step (3): 15 parts of functional components and 25 parts of copolymer C are mixed by weight, 0.2 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 250 r / min and 70° C. for 2 h, followed by washing and drying at 100° C. with a moisture content of <0.1% after drying, 0.5 parts of zinc stearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0056] Comparative Example 2

[0057] The difference from Example 1 is that no functional filler was prepared, specifically:

[0058] A production process for high-performance ABS modified material comprises the following steps:

[0059] Step (1): adding 0.5 parts of tetrabutyl titanate to a 10% ethanol aqueous solution by weight and uniformly dispersing the mixture to obtain liquid A; taking 15 parts of liquid A, adding 15 parts of soft ferrite powder particles with an average particle size of 1.3 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 7 hours, drying, calcining at 600° C. for 2 hours, cooling to room temperature, and heat-treating the mixture at 140° C. for 0.5 hours, and dispersing the mixture to obtain active material B;

[0060] Step (2): Disperse 4 parts of active substance B in 35 parts of butadiene monomer in an emulsion, add 0.3 parts of potassium persulfate, polymerize at 700 r / min and 70° C. for 2 h, then add 8 parts of styrene monomer and 6 parts of acrylonitrile monomer, and then add 0.08 parts of benzoyl peroxide, and react at 600 r / min and 70° C. for 7 h to obtain a functional component;

[0061] Step (3): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 70 parts of 6% acetone solution by weight, adding 0.13 parts of azobisisobutyronitrile and 0.2 parts of sodium dodecylbenzenesulfonate, and reacting at 700 r / min and 65° C. to 80° C. for 5 hours to obtain copolymer C;

[0062] Step (4): 15 parts of functional components and 25 parts of copolymer C are mixed by weight, 0.2 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 250 r / min and 70° C. for 2 hours, followed by washing and drying at 100° C. with a moisture content of less than 0.1% after drying. 0.5 parts of zinc stearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0063] Comparative Example 3

[0064] The difference from Example 1 is that no functional components were prepared, specifically:

[0065] A production process for high-performance ABS modified material comprises the following steps:

[0066] Step (1): adding 0.5 parts of tetrabutyl titanate to a 10% ethanol aqueous solution by weight and uniformly dispersing the mixture to obtain liquid A; taking 15 parts of liquid A, adding 15 parts of soft ferrite powder particles with an average particle size of 1.3 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 7 hours, drying, calcining at 600° C. for 2 hours, cooling to room temperature, and heat-treating the mixture at 140° C. for 0.5 hours, and dispersing the mixture to obtain active material B;

[0067] Step (2): 15 parts of active substance B and 0.4 parts of γ-aminopropyltriethoxysilane were added to 13 parts of a 10% ethanol aqueous solution by weight, the pH was adjusted to 6 with formic acid, and the mixture was stirred at 900 rpm for 60 minutes. The solid phase was separated by centrifugation and dried to obtain a functional filler;

[0068] Step (3): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 70 parts of 6% acetone solution by weight, adding 0.13 parts of azobisisobutyronitrile and 0.2 parts of sodium dodecylbenzenesulfonate, and reacting at 700 r / min and 65° C. to 80° C. for 5 hours to obtain copolymer C;

[0069] Step (4): 15 parts of functional filler and 25 parts of copolymer C are mixed by weight, 0.2 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 250 r / min and 70° C. for 2 hours, followed by washing and drying at 100° C. with a moisture content of less than 0.1% after drying. 0.5 parts of zinc stearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0070] Comparative Example 4

[0071] The difference from Example 1 is that the functional filler is directly incorporated into the ABS resin, specifically:

[0072] A production process for high-performance ABS modified material comprises the following steps:

[0073] Step (1): adding 0.5 parts of tetrabutyl titanate to a 10% ethanol aqueous solution by weight and uniformly dispersing the mixture to obtain liquid A; taking 15 parts of liquid A, adding 15 parts of soft ferrite powder particles with an average particle size of 1.3 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 7 hours, drying, calcining at 600° C. for 2 hours, cooling to room temperature, and heat-treating the mixture at 140° C. for 0.5 hours, and dispersing the mixture to obtain active material B;

[0074] Step (2): 15 parts of active substance B and 0.4 parts of γ-aminopropyltriethoxysilane were added to 13 parts of a 10% ethanol aqueous solution by weight, the pH was adjusted to 6 with formic acid, and the mixture was stirred at 900 rpm for 60 minutes. The solid phase was separated by centrifugation and dried to obtain a functional filler;

[0075] Step (3): 5 parts of functional filler and 25 parts of dry ABS particles are mixed by weight, 0.5 parts of zinc stearate are added, and the mixture is melt-kneaded by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0076] Comparative Example 5

[0077] The difference from Example 1 is that the calcination temperature in step (1) is too high, specifically:

[0078] A production process for high-performance ABS modified material comprises the following steps:

[0079] Step (1): adding 0.5 parts of tetrabutyl titanate by weight to a 10% ethanol aqueous solution and uniformly dispersing the mixture to obtain liquid A; taking 15 parts of liquid A, adding 15 parts of soft ferrite powder particles with an average particle size of 1.3 μm, then adding hydrochloric acid to adjust the pH to 7, hydrolyzing the mixture for 7 hours, drying, calcining at 800° C. for 2 hours, cooling to room temperature, and heat-treating the mixture at 140° C. for 0.5 hours, and dispersing the mixture to obtain active material B;

[0080] Step (2): 15 parts of active substance B and 0.4 parts of γ-aminopropyltriethoxysilane were added to 13 parts of a 10% ethanol aqueous solution by weight, the pH was adjusted to 6 with formic acid, and the mixture was stirred at 900 rpm for 60 minutes. The solid phase was separated by centrifugation and dried to obtain a functional filler;

[0081] Step (3): Dispersing 4 parts of functional filler in 35 parts of butadiene monomer in an emulsion, adding 0.3 parts of potassium persulfate, polymerizing at 700 r / min and 70° C. for 2 h, then adding 8 parts of styrene monomer and 6 parts of acrylonitrile monomer, and then adding 0.08 parts of benzoyl peroxide, reacting at 600 r / min and 70° C. for 7 h to obtain a functional component;

[0082] Step (4): adding 13 parts of acrylonitrile monomer and 18 parts of styrene monomer to 70 parts of 6% acetone solution by weight, adding 0.13 parts of azobisisobutyronitrile and 0.2 parts of sodium dodecylbenzenesulfonate, and reacting at 700 r / min and 65° C. to 80° C. for 5 hours to obtain copolymer C;

[0083] Step (5): 15 parts of functional components and 25 parts of copolymer C are mixed by weight, 0.2 parts of polyoxyethylene demulsifier are added, and the mixture is reacted at 250 r / min and 70° C. for 2 h, followed by washing and drying at 100° C. with a moisture content of <0.1% after drying, 0.5 parts of zinc stearate are added, and the mixture is melt-mixed by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

[0084] The products obtained in Examples 1-3 and Comparative Examples 1-5 were made into test specimens according to the following standards and subjected to relevant performance tests.

[0085] Tensile strength was tested according to ASTM D638 (23°C).

[0086] Flexural modulus was tested according to ASTM D790;

[0087] Test the Izod notched impact strength (23°C) according to ASTM D256.

[0088] Use a surface resistance tester to test its surface resistance;

[0089] Refer to ASTM D4935 standard to test electromagnetic shielding effect;

[0090] Place the sample outdoors for 60 days and observe the color change

[0091] The specific test results are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] From the analysis of the results of Examples 1-3 and Comparative Examples 1-5, this solution can obtain better mechanical properties and electromagnetic shielding effects, and has better antioxidant properties.

[0096] Comparative Example 1 differs from Example 1 in that nano-titanium dioxide and soft ferrite powder particles are added separately, i.e., they are not added to the preparation of the ABS modified material in a heterojunction structure. The heterojunction structure of this solution broadens the absorption range of ultraviolet light waves. At the same time, since the heterojunction is the junction of two substances, i.e., the grain boundary, the resistance is large, which may lead to increased electrical loss and thus improve the electromagnetic shielding effect. In addition, the soft ferrite powder particles are micron-sized, and directly mixing them into ABS without modification will cause compatibility issues with ABS. Nano-titanium dioxide has dispersibility issues, so the mechanical properties of Comparative Example 1 are also poor. Comparative Example 2 differs from Example 1 in that no functional filler is prepared, and similarly has dispersibility and compatibility issues, resulting in poor mechanical properties.

[0097] Comparative Example 3 differs from Example 1 in that no functional component is prepared. In Example 1 of this solution, the main purpose of the functional component is also to disperse the particles. At the same time, the soft ferrite powder particles will undergo magnetic domain deflection when absorbing electromagnetic waves. The functional component uses the soft ferrite as the core. The magnetic domain deflection may drive the movement of a small amount of ABS chains around the soft ferrite powder particles, which may increase energy loss and improve electromagnetic wave absorption capacity. The soft ferrite powder particles in Comparative Example 3 do not have a core function, and therefore have poor dispersibility. Similarly, Comparative Example 4 differs from Example 1 in that the functional filler is directly incorporated into the ABS resin, which also has dispersibility issues.

[0098] Comparative Example 5 differs from Example 1 in that the calcination temperature in step (1) is too high. The excessively high calcination temperature in step (1) causes the titanium dioxide nanoparticles to grow, and some titanium atoms diffuse into the grain boundaries of the soft ferrite, resulting in an increase in the coercive force of the soft ferrite, hindering the movement of magnetic domains. At the same time, the difference at the grain boundaries decreases, resulting in a decrease in resistance and a deterioration in the electromagnetic shielding effect.

Claims

1. A production process for high-performance ABS modified materials, characterized in that: The following steps are involved: Step (1): adding 0.1 to 1 parts by weight of tetrabutyl titanate to an ethanol aqueous solution having a mass concentration of 10% to 20% and uniformly dispersing the mixture to obtain solution A; Take 10 to 20 parts of liquid A, add 10 to 20 parts of soft magnetic powder particles, then add hydrochloric acid to adjust the pH to 5 to 7, hydrolyze for 5 to 8 hours, dry, calcine at 550°C to 650°C for 1 to 2 hours, cool to room temperature, and heat at 120°C to 150°C for 0.5 to 1 hour, disperse, and obtain active material B; the soft magnetic powder particles are soft ferrite powder particles; Step (2): by weight, add 10 to 20 parts of active substance B and 0.3 to 0.5 parts of silane coupling agent to 10 to 15 parts of 10% to 20% ethanol aqueous solution, adjust the pH to 5 to 6 with carboxylic acid, stir at 800 r / min to 1000 r / min for 30 min to 60 min, centrifuge to obtain a solid phase, dry, and obtain a functional filler; Step (3): by weight, 3 to 5 parts of functional filler are dispersed in 30 to 40 parts of butadiene monomer in an emulsion, 0.15 to 0.5 parts of initiator A are added, and polymerization is carried out at 600 r / min to 800 r / min and 50°C to 80°C for 2h to 3h, followed by addition of 5 to 10 parts of styrene monomer and 5 to 10 parts of acrylonitrile monomer, and then 0.05 to 0.1 parts of initiator B, and the reaction is carried out at 400 r / min to 800 r / min and 60°C to 80°C for 5h to 10h to obtain a functional component; Step (4): adding 10 to 15 parts of acrylonitrile monomer and 15 to 20 parts of styrene monomer to 50 to 80 parts of acetone solution having a mass concentration of 5% to 10%, adding 0.1 to 0.15 parts of initiator C and 0.1 to 0.3 parts of emulsifier, and reacting at 600 r / min to 800 r / min and 65° C. to 80° C. for 4 h to 6 h to obtain copolymer C; Step (5): By weight, 10 to 20 parts of functional components and 15 to 30 parts of copolymer C are mixed, 0.1 to 0.3 parts of demulsifier are added, and the mixture is reacted at 200 r / min to 300 r / min and 60°C to 80°C for 2 h to 3 h, followed by washing and drying, and 0.1 to 1 part of lubricant is added. The mixture is melt-kneaded by a twin-screw extruder, extruded, and pelletized to obtain an ABS modified material.

2. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (1), the average particle size of the soft ferrite powder particles is 1 μm to 2 μm.

3. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (2), the silane coupling agent is γ-aminopropyltriethoxysilane.

4. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (2), the carboxylic acid is one of formic acid, acetic acid, propionic acid, citric acid, and tartaric acid.

5. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (2), the average particle size of the functional filler is 0.5 μm to 1.5 μm.

6. The production process of the high-performance ABS modified material according to claim 1, characterized in that: In step (3), the initiator A is persulfate, and the initiator B is benzoyl peroxide.

7. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (4), the initiator C is azobisisobutyronitrile and the emulsifier is sodium dodecylbenzenesulfonate.

8. The production process of high-performance ABS modified material according to claim 1, characterized in that: In step (5), the demulsifier is a polyether or quaternary ammonium salt demulsifier; the lubricant is one of zinc stearate, trihydroxystearate, paraffin or polyethylene wax.

9. The production process of the high-performance ABS modified material according to claim 1, characterized in that: In step (5), the drying temperature is 80°C-120°C; and the moisture content after drying is <0.1%.

10. A high-performance ABS modified material prepared by the production process of the high-performance ABS modified material according to any one of claims 1 to 9.

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