A foaming-resistant ABS / PP alloy material and a preparation method thereof

Abstract

The application discloses a kind of antifoaming agent-resistant acrylonitrile-butadiene-styrene copolymer (ABS) / polypropylene (PP) alloy material and preparation method thereof, comprising: 50-95 parts by weight of ABS;3-30 parts by weight of PP;1-10 parts by weight of organic montmorillonite modified nucleating agent, optionally, 0-3 parts by weight of processing aid.The alloy material of the application not only has excellent mechanical properties, but also significantly improves its antifoaming agent resistance.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials and relates to an ABS / PP alloy material resistant to foaming agents and its preparation method. Background Technology

[0002] ABS is a general-purpose engineering plastic with well-balanced properties in all aspects. It has high mechanical strength, good impact resistance and toughness, dimensional stability, and good electrical insulation. Among them, sheet-grade ABS exhibits excellent uniform thinning ability in vacuum forming, and its use as refrigerator liners offers advantages such as high gloss and good chemical resistance.

[0003] In industrial refrigerator manufacturing, polyurethane foam is typically used to insulate the plastic inner liner from the outer metal shell. It's important to note that the blowing agent used in polyurethane foaming often remains in the foam layer, which can corrode the refrigerator liner over long-term use. To date, various types of ABS compositions have been developed to resist the corrosive effects of blowing agents such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), and alkanes, exhibiting good chemical resistance. In recent years, with increasing global warming pressures, environmental requirements for blowing agents have become increasingly stringent. Novel hydrofluoroolefin (HFO) blowing agents have shown great application potential in the polyurethane foaming field due to their excellent environmental performance and thermal conductivity. However, HFO blowing agents have a more pronounced and rapid corrosive effect on the ABS material of the refrigerator liner, making the liner more prone to cracking and other damage.

[0004] CN 109312134 B discloses an ABS molding composition with improved crack resistance and chemical resistance, and its use, comprising 10 to 35 wt% ABS grafted rubber A obtained by emulsion polymerization, 50 to 75 wt% SAN copolymer B, 4 to 20 wt% copolymer C from ethylene and (meth)acrylate C1-C6 alkyl esters, and 4 to 20 wt% ABS grafted rubber copolymer D obtained by bulk polymerization.

[0005] Patent 109476895B also discloses an ABS molding composition with improved crack resistance and chemical resistance, and its use, comprising 10 to 35 wt% ABS grafted rubber A obtained by emulsion polymerization, 50 to 70 wt% SAN copolymer B, 4 to 20 wt% elastomeric SBC block copolymer C, and 4 to 20 wt% ABS grafted rubber copolymer D obtained by bulk polymerization. Both patents improve the environmental stress cracking resistance of ABS compositions using HFO foaming agents; however, the extensive use of copolymers C and D significantly impairs the strength and modulus of ABS, thus affecting its thermoforming properties.

[0006] Therefore, it is necessary to develop a new ABS composition that can resist the erosion of HFO foaming agent while maintaining excellent mechanical and processing properties, so that it can be successfully applied to refrigerator liners.

[0007] Considering that PP is a general-purpose plastic with low cost, its simple molecular chain structure and high crystallinity endow it with excellent chemical resistance, blending ABS and PP can improve the foaming agent resistance of ABS and reduce costs, while also increasing the impact toughness of PP and expanding its application range. However, ABS and PP have significantly different molecular structures, polarities, and solubility parameters, resulting in poor compatibility and consequently, poor mechanical properties of ABS / PP binary blends. To address this issue, compatibilization methods are generally used to improve compatibility and enhance interfacial forces.

[0008] Chinese invention patents CN 106751656 A, CN 111218061 A, CN 111040412 A and CN111218061A improve the compatibility of ABS / PP blends by simply adding PP grafts or compatibilizers with multi-component copolymer structures. However, the addition of a large amount of compatibilizer will reduce the mechanical strength of the ABS / PP alloy, which cannot meet the requirements of thermoforming. Summary of the Invention

[0009] To address the aforementioned problems, this invention provides a foaming agent-resistant ABS / PP alloy material and its preparation method. The alloy material involved in this invention has excellent mechanical strength and good foaming agent resistance, and the preparation process is simple and easy to implement.

[0010] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0011] A foaming agent resistant ABS / PP alloy material, prepared from the following materials:

[0012] 50-95 parts by weight of ABS;

[0013] 5-30 parts by weight of PP;

[0014] 1-10 parts by weight of organo-montmorillonite modified nucleating agent;

[0015] Optionally, 0-3 parts by weight of processing aid.

[0016] Preferably, the foam-resistant ABS / PP alloy material of the present invention comprises:

[0017] 80-95 parts by weight of ABS;

[0018] 5-15 parts by weight of PP;

[0019] 2-6 parts by weight of organo-montmorillonite modified nucleating agent;

[0020] 0.1-2 parts by weight of processing aid.

[0021] In the foam-resistant ABS / PP alloy material of the present invention, the organomontmorillonite modified nucleating agent is a long alkyl chain quaternary ammonium salt modified montmorillonite, and the nucleating agent is bis(3,4-dimethylbenzyl sorbitol) (DMDBS).

[0022] In this invention, the preparation method of the organomontmorillonite modified nucleating agent includes the following steps:

[0023] (1) A dispersion was prepared by dispersing montmorillonite and long alkyl chain quaternary ammonium salt in deionized water respectively; the dispersion of long alkyl chain quaternary ammonium salt was slowly added to the montmorillonite dispersion to form a mixture, and stirred at a constant temperature; after stirring, the solid after solid-liquid separation was washed with deionized water, filtered and dried to obtain organic modified montmorillonite powder (OMMT).

[0024] (2) Dissolve the organic modified montmorillonite powder in deionized water to prepare a dispersion, and dissolve the nucleating agent bis(3,4-dimethylbenzyl methylene sorbitol) (DMDBS) in deionized water to prepare a dispersion; add the nucleating agent dispersion to the organic modified montmorillonite powder dispersion, stir at a constant temperature, filter, wash, and dry to obtain the organic modified montmorillonite nucleating agent (OMMT-DMDBS).

[0025] Preferably, the long alkyl chain quaternary ammonium salt is one or more of hexadecyltrimethylammonium bromide, dodecyldimethylbenzylammonium bromide and octadecyldimethylhydroxyethyl quaternary ammonium nitrate; more preferably, the alkyl quaternary ammonium salt is hexadecyltrimethylammonium bromide.

[0026] In this invention, the concentration of the montmorillonite dispersion in step (1) is 0.5-1.5 mg / mL, and the concentration of the long alkyl chain quaternary ammonium salt dispersion is 1-2 mg / mL.

[0027] In this invention, the volume ratio of the montmorillonite dispersion to the long alkyl chain quaternary ammonium salt dispersion in step (1) is 0.8 to 1.2:1.

[0028] In this invention, the temperature of constant temperature stirring in step (1) is 50-70℃, and the stirring time is 2-6h.

[0029] In this invention, the drying temperature in steps (1) and (2) is 10-50℃ and the drying time is 1-48h.

[0030] In this invention, the concentration of the dispersion of organic modified montmorillonite powder in step (2) is 0.5-1.0 mg / mL.

[0031] In this invention, the concentration of the nucleating agent dispersion in step (2) is 0.5-1.0 mg / mL.

[0032] In this invention, the volume ratio of montmorillonite dispersion to nucleating agent dispersion in step (2) is 1 to 2:1.

[0033] In this invention, the temperature of constant temperature stirring in step (2) is 30-60℃ and the time is 4-8h.

[0034] In the foaming agent-resistant ABS / PP alloy material of the present invention, the ABS is prepared by emulsion-bulk SAN blending or by bulk method, preferably by emulsion-bulk SAN blending ABS; preferably, under test conditions of 220℃ and 10kg, the melt flow index of ABS is 4-40g / 10min, more preferably 4-20g / 10min, and even more preferably 4-10g / 10min. A higher melt flow index of ABS indicates better ABS flowability, and thus better flowability of the composition; however, a higher melt flow index of ABS, i.e., a lower ABS molecular weight, indicates poorer foaming agent resistance of the composition.

[0035] In the foam-resistant ABS / PP alloy material of the present invention, the polypropylene is one or more of homopolymer or copolymer polypropylene. Preferably, the polypropylene is homopolymer polypropylene, and under test conditions of 220°C and 10 kg, the melt index range is 2-100 g / 10 min, more preferably 5-50 g / 10 min, and even more preferably 5-10 g / 10 min.

[0036] In the foam-resistant ABS / PP alloy material of the present invention, the processing aids are selected from one or more combinations of antioxidants, lubricants, ultraviolet absorbers, flame retardants, toughening agents, compatibilizers, light stabilizers, heat stabilizers, metal passivators, plasticizers, anti-sticking agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid removers, hydrolysis-resistant agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, antifogging agents, light diffusing agents, infrared absorbers, fluorescent whitening agents, and laser marking agents.

[0037] The antioxidant is one or a combination of two or more of the following: hindered phenols, phosphites, thioesters, benzofurans, acryloyl-modified phenols, and hydroxylamine antioxidants. Preferably, one or more of antioxidants 1076, 1010, 168, and 618 are used.

[0038] The lubricant is one or a combination of two or more of the following: fatty alcohols, metallic soaps, fatty acids, fatty acid esters, lignite and its derivatives, amide waxes, saturated hydrocarbons, polyolefin waxes and their derivatives, organosilicon and silicone powders, and organofluorine compounds. Amide wax lubricants are preferred.

[0039] The ultraviolet absorber is one or a combination of two or more of the following: benzophenones, benzotriazoles, triazines, benzoic acid esters, cyanoacrylates, and phenylimidazoliums. Benzotriazoles and triazines are preferred, such as Tinuvin 234, Tinuvin 360, and Tinuvin 1577 from BASF.

[0040] The foam-resistant ABS / PP products of the present invention can selectively use the above-mentioned additives according to the product performance characteristics.

[0041] On the other hand, the present invention also provides a method for preparing the above-mentioned foaming agent resistant ABS / PP alloy material, the method comprising the following steps:

[0042] (1) Premixing: ABS, PP, organomontmorillonite modified nucleating agent and optional processing aids are mixed in proportion to obtain a premix;

[0043] (2) Extrusion: The obtained premix is ​​melt-blended, granulated and dried using an extruder to obtain foaming agent resistant ABS / PP alloy material granules;

[0044] Preferably, the extruder in step (2) is a twin-screw extruder, wherein the processing temperature of the twin-screw extruder is 200-220℃, the screw speed is 300-800rpm, and the vacuum degree is between -0.9 bar and -0.5 bar.

[0045] The positive effects of this invention are as follows:

[0046] (1) In this invention, the two ends of the long alkyl chain quaternary ammonium salt are N and N respectively. + Cationic and long-chain alkyl groups are positively charged when dissolved in water. The long alkyl side chains in their molecular structure significantly increase their compatibility with the polymer matrix. Montmorillonite has a negatively charged surface and can form non-covalent bonds with long-chain quaternary ammonium salts. The long alkyl groups on the long-chain quaternary ammonium salts give them lipophilicity, while the silicate layers give them hydrophilicity. In other words, alkylated modified montmorillonite is amphiphilic.

[0047] (2) In this invention, the nucleating agent is bis(3,4-dimethylbenzyl sorbitol) (DMDBS), whose hydroxyl groups have good affinity for silicates and can be adsorbed onto the surface of montmorillonite. The resulting organo-montmorillonite-modified nucleating agent has alkyl chains that can entangle with PP molecular chains, while montmorillonite has a similar polarity to the acrylonitrile segments in ABS, thus playing a compatibilizing role. In addition, the nucleating agent loaded on montmorillonite also promotes PP crystallization at the interface. The ABS / PP blend with added organo-montmorillonite-modified nucleating agent exhibits enhanced interfacial interaction, increased PP crystallinity, and the lamellar structure of montmorillonite, all of which slow down the erosion effect of foaming agents, thereby improving the foaming agent resistance. Detailed Implementation

[0048] To better understand and implement the invention, the present invention will be further described below with reference to the embodiments. However, the present invention is not limited to the listed embodiments, but should also include any other known modifications within the scope of the claims of the present invention.

[0049] Performance tests are as follows:

[0050] Notched impact strength was tested according to ASTM D256 standard.

[0051] Tensile properties were tested according to ASTM D638.

[0052] Foaming agent resistance test: The tensile specimen under 0.5% strain was completely immersed in trans-1-chloro-3,3,3-trifluoropropylene (LBA), placed in a 0°C refrigerator, and removed after 48 hours to test the change in tensile strength.

[0053] Crystallinity test: Thermodynamic tests are performed using differential scanning calorimetry (DSC) to analyze the crystallization behavior of the material.

[0054] The components of the comparative examples and embodiments are as follows:

[0055] ABS-1: ABS produced by emulsion-bulk SAN blending method, with a melt flow index of 5 g / 10 min (220℃, 10 kg), commercially available;

[0056] PP-1: Homopolymer polypropylene, melt flow index of 18 g / 10 min (230℃, 2.16 kg), commercially available;

[0057] Quaternary ammonium salt: hexadecyltrimethylammonium bromide (CTAB), Shanghai Aladdin Biochemical Technology Co., Ltd.;

[0058] Quaternary ammonium salt: Dodecyl dimethyl benzyl ammonium bromide, Shanghai Aladdin Biochemical Technology Co., Ltd.

[0059] Antioxidant: Irganox B900, manufactured by BASF.

[0060] Lubricant: EBS, manufactured by CMS Indonesia.

[0061] Preparation of organomontmorillonite modified nucleating agent (1):

[0062] First, montmorillonite was dispersed in deionized water to prepare a 1 mg / mL dispersion. Hexadecyltrimethylammonium bromide (CTAB) was dissolved in deionized water to prepare a 1 mg / mL dispersion, which was then slowly poured into an equal volume of the montmorillonite dispersion to form a mixture. The mixture was stirred at 25°C for 4 hours. The solid after solid-liquid separation was washed with deionized water, filtered, and dried to obtain alkylated modified montmorillonite solid powder. The alkylated modified montmorillonite solid powder was then dissolved in water to prepare a 1 mg / mL dispersion. The nucleating agent bis(3,4-dimethylbenzyl sorbitol) (DMDBS) was dissolved in water to prepare a 1 mg / mL dispersion. The nucleating agent aqueous solution was slowly poured into the alkylated modified montmorillonite aqueous dispersion, stirred at 60°C for 6 hours, filtered, washed, and dried to obtain organo-montmorillonite modified nucleating agent-1, i.e., nanoparticle-1.

[0063] Preparation of organomontmorillonite modified nucleating agent (2):

[0064] First, montmorillonite was dispersed in deionized water to prepare a 1 mg / mL dispersion. Dodecyl dimethyl benzyl ammonium bromide was dissolved in deionized water to prepare a 1 mg / mL dispersion, which was then slowly poured into an equal volume of the montmorillonite dispersion to form a mixture. The mixture was kept at 25°C and stirred for 6 hours. The solid after solid-liquid separation was washed with deionized water, filtered, and dried to obtain alkylated modified montmorillonite solid powder. The alkylated modified montmorillonite solid powder was then dissolved in water to prepare a 1.0 mg / mL dispersion. The nucleating agent bis(3,4-dimethylbenzyl sorbitol) (DMDBS) was dissolved in water to prepare a 1.0 mg / mL dispersion. The nucleating agent aqueous solution was slowly poured into the alkylated modified montmorillonite aqueous dispersion, stirred at 60°C for 6 hours, filtered, washed, and dried to obtain organo-montmorillonite modified nucleating agent-2, i.e., nanoparticle-2.

[0065] Preparation of montmorillonite-modified nucleating agent (3):

[0066] First, montmorillonite was dispersed in deionized water to prepare a 1 mg / mL dispersion. The nucleating agent bis(3,4-dimethylbenzyl sorbitol) (DMDBS) was dissolved in water to prepare a 1.0 mg / mL dispersion. The nucleating agent aqueous solution was slowly poured into the montmorillonite aqueous dispersion. After stirring at 60°C for 6 hours, the mixture was filtered, washed, and dried to obtain montmorillonite modified nucleating agent-3, i.e., nanoparticle-3.

[0067] Preparation of quaternary ammonium salt modified nucleating agent (4):

[0068] First, CTAB was dissolved in deionized water to prepare a dispersion of 1 mg / mL. Then, the nucleating agent bis(3,4-dimethylbenzyl sorbitol) (DMDBS) was dissolved in water to prepare a dispersion of 1.0 mg / mL. The nucleating agent aqueous solution was slowly poured into the CATB aqueous dispersion. After stirring at 60°C for 6 hours, the mixture was filtered, washed, and dried to obtain CTAB modified nucleating agent-4, i.e., nanoparticle-4.

[0069] Example 1

[0070] The raw materials include the following weight ratios: ABS-1: 95 parts, PP-1: 5 parts, organomontmorillonite modified nucleating agent-1: 2 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0071] Example 2

[0072] The raw materials include the following weight ratios: ABS-1: 90 parts, PP-1: 10 parts, organomontmorillonite modified nucleating agent-1: 2 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0073] Example 3

[0074] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, organomontmorillonite modified nucleating agent-1: 2 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0075] Example 4

[0076] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, organomontmorillonite modified nucleating agent-1 part, antioxidant 0.3 parts, and lubricant 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50mm / s, and the injection pressure at 60bar to obtain standard specimens and templates.

[0077] Example 5

[0078] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, organomontmorillonite modified nucleating agent-1: 6 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0079] Example 6

[0080] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, organomontmorillonite modified nucleating agent-2: 6 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0081] Comparative Example 1

[0082] The raw materials include ABS-1: 100 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts by weight. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0083] Comparative Example 2

[0084] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, DMDBS nucleating agent: 6 parts, antioxidant: 0.3 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50mm / s, and the injection pressure at 60bar to obtain standard specimens and templates.

[0085] Comparative Example 3

[0086] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, montmorillonite-modified nucleating agent-3: 6 parts, antioxidant: 0.3 parts, nucleating agent: 4 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0087] Comparative Example 4

[0088] The raw materials include the following weight ratios: ABS-1: 85 parts, PP-1: 15 parts, antioxidant: 0.3 parts, quaternary ammonium salt modified nucleating agent-4: 6 parts, and lubricant: 0.3 parts. The material composition is mixed in a high-speed mixer, then fed into a twin-screw extruder for extrusion granulation. The processing temperature is 210℃, the screw speed is 400 rpm, and the vacuum level of the twin-screw metering section is within -0.7 bar. After granulation, the material is dried at 80℃ for 4 hours to fully remove moisture. The injection mold temperature is controlled at 50℃, the barrel temperature at 210℃, the injection speed at 50 mm / s, and the injection pressure at 60 bar to obtain standard specimens and templates.

[0089] Comparison of material properties between the examples and comparative examples:

[0090]

[0091]

[0092] As can be seen from the various embodiments and comparative examples, adding an appropriate amount of organomontmorillonite modifying nucleating agent to ABS / PP can significantly improve the crystallinity of PP, enhance the interfacial force between ABS and PP, and greatly improve the impact strength and foaming agent resistance, thus greatly expanding the application range of ABS / PP alloy materials.

[0093] Those skilled in the art should understand that this invention is not limited to the above embodiments. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims.

Claims

1. A foaming agent resistant ABS / PP alloy material, prepared from the following materials: 50-95 parts by weight of ABS; 5-30 parts by weight of PP; 1-10 parts by weight of organo-montmorillonite modified nucleating agent; 0-3 parts by weight of processing aids; The organomontmorillonite modified nucleating agent is a long alkyl chain quaternary ammonium salt modified montmorillonite, and the nucleating agent is bis(3,4-dimethylbenzyl sorbitol) (DMDBS).

2. The alloy material as described in claim 1, characterized in that, It is made from the following materials: 80-95 parts by weight of ABS; 5-15 parts by weight of PP; 2-6 parts by weight of organo-montmorillonite modified nucleating agent; 0.1-2 parts by weight of processing aid.

3. The alloy material as described in claim 1, characterized in that, The method for preparing the organo-montmorillonite modified nucleating agent includes the following steps: (1) A dispersion was prepared by dispersing montmorillonite and long alkyl chain quaternary ammonium salt in deionized water respectively; the dispersion of long alkyl chain quaternary ammonium salt was slowly added to the montmorillonite dispersion to form a mixture, and stirred at a constant temperature; after stirring, the solid after solid-liquid separation was washed with deionized water, filtered and dried to obtain organic modified montmorillonite powder (OMMT). (2) Dissolve the organic modified montmorillonite powder in deionized water to prepare a dispersion, and dissolve the nucleating agent bis(3,4-dimethylbenzyl sorbitol) (DMDBS) in deionized water to prepare a dispersion; add the nucleating agent dispersion to the organic modified montmorillonite powder dispersion, stir at constant temperature, filter, wash, and dry to obtain the organic modified montmorillonite nucleating agent (OMMT-DMDBS).

4. The alloy material according to any one of claims 1-3, characterized in that, The long alkyl chain quaternary ammonium salt is one or more of hexadecyltrimethylammonium bromide, dodecyldimethylbenzylammonium bromide, and octadecyldimethylhydroxyethyl quaternary ammonium nitrate; and / or, the concentration of the montmorillonite dispersion in step (1) is 0.5-1.5 mg / mL; and / or, the concentration of the long alkyl chain quaternary ammonium salt dispersion is 1-2 mg / mL; and / or, the volume ratio of the montmorillonite dispersion to the long alkyl chain quaternary ammonium salt dispersion in step (1) is 0.8-1.2:1; and / or, the temperature of the constant temperature stirring in step (1) is 50-70℃, and the stirring time is 2-6 h.

5. The alloy material according to any one of claims 1-3, characterized in that, In step (2), the concentration of the organic modified montmorillonite powder dispersion is 0.5-1.0 mg / mL; and / or, the concentration of the nucleating agent dispersion in step (2) is 0.5-1.0 mg / mL; and / or, the volume ratio of the montmorillonite dispersion to the nucleating agent dispersion in step (2) is 1-2:1; and / or, the temperature of the constant temperature stirring in step (2) is 30-60℃, and the time is 4-8h.

6. The alloy material according to any one of claims 1-3, characterized in that, When the test conditions are 220℃ and 10kg, the melt flow index of the ABS is 4-40g / 10min; and / or, the polypropylene is homopolymer polypropylene, and when the test conditions are 220℃ and 10kg, the melt flow index ranges from 2-100g / 10min.

7. The alloy material according to any one of claims 1-3, characterized in that, The processing aids are selected from one or more combinations of antioxidants, lubricants, flame retardants, toughening agents, compatibilizers, light stabilizers, heat stabilizers, metal passivators, plasticizers, anti-sticking agents, colorants, coupling agents, nucleating agents, foaming agents, antibacterial agents, mildew inhibitors, acid removers, hydrolysis resistant agents, chain extenders, flow modifiers, matting agents, antistatic agents, reinforcing agents, fillers, antifogging agents, light diffusing agents, infrared absorbers, fluorescent whitening agents, and laser marking agents.

8. The method for preparing the alloy material according to any one of claims 1-7, wherein the method comprises the following steps: (1) Premixing: ABS, PP, organomontmorillonite modified nucleating agent and optional processing aids are mixed in proportion to obtain a premix; (2) Extrusion: The obtained premix is ​​melt-blended, granulated and dried using an extruder to obtain foaming agent resistant ABS / PP alloy material granules.

9. The preparation method according to claim 8, characterized in that, In step (2), the extruder is a twin-screw extruder with a processing temperature of 200-220℃, a screw speed of 300-800rpm, and a vacuum degree between -0.9 bar and -0.5 bar.

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