A high heat-resistant and flame-retardant imitation metal PC / ABS alloy material and its preparation method

Abstract

A highly heat-resistant, flame-retardant, metal-like PC / ABS alloy material and its preparation method are disclosed. The alloy is formulated from the following raw materials in percentage by weight: 60-90% PC, 0.05-30% ABS, 0.1-10% compatibilizer, 1-30% flame retardant, 0.05-10% anti-dripping agent, 0.01-10% nano-hardener, 0.1-0.5% antioxidant, 0.001-5% modified aluminum powder, 0.001-5% modified pearlescent powder, and 0.0001-1% color powder. The introduction of the nano-hardener significantly improves the alloy's heat resistance and surface hardness, achieving a ball pressure temperature of up to 125°C and a flame retardancy of 1.5 mmV0. The use of new modified aluminum powder and modified pearlescent powder increases powder toughness. A shear-free single-screw extrusion process reduces the shear strength of the screw, resulting in the PC / ABS alloy material.

Description

Technical Field

[0001] The present invention relates to the technical field of composite plastic preparation, in particular to a spray-free, highly heat-resistant, flame-retardant, metal-like PC / ABS alloy material and a preparation method thereof. Background Art

[0002] PC / ABS composite materials have the excellent heat and weather resistance, dimensional stability and impact resistance of PC (polycarbonate) resin, and the excellent processing fluidity of ABS (acrylonitrile-butadiene-styrene) resin. This composite material can maintain its excellent comprehensive performance when used to prepare thin-walled and complex-shaped products, and is therefore widely used in technical fields such as home appliances, automobiles, and 3C digital products. With the improvement of people's aesthetic needs, the performance of materials used to prepare the appearance of home appliances has received more and more attention. Traditional injection molded parts of PC / ABS composite materials can enhance the aesthetic effect of the product through secondary processing processes such as spraying, silk screen printing, and film transfer, but they are not environmentally friendly and costly. There are already spray-free appearance materials that can be injected into the mold in one go to replace the above processes, but these spray-free appearance materials are insufficient in functionality. While meeting the product appearance conditions, they cannot meet the product performance requirements, such as special properties such as heat resistance and flame retardancy.

[0003] Currently, the existing technology provides a high-gloss PC / ABS alloy material. This high-gloss spray-free PC / ABS alloy material includes PC resin, ABS resin, and some additives and effect powder. This existing technology can improve the fluidity of the resin and reduce traces by selecting the ratio of the particle size of the added effect powder. However, in this technical solution, a single pearlescent formula system and a twin-screw process are used, which makes the reflective effect of the alloy material and the silver powder pearlescent particle size poorly maintained, and the optimal high-gloss effect cannot be achieved, and there is no flame retardant function. Another existing technology also discloses a PC / ABS flame-retardant composite material, including PC, ABS, additives, and at least one flame retardant. Although this technology can meet the flame retardant performance, the product prepared by the composite material has poor appearance and low ball pressure temperature, which cannot meet the product appearance and 125°C ball pressure temperature requirements of the live parts.

[0004] Therefore, how to overcome the defects of low gloss of the spray-free metal-like flame-retardant PC / ABS alloy material products prepared by the existing technology and the inability to meet the ball pressure temperature requirement of 125°C is an urgent problem to be solved in this field. Summary of the Invention

[0005] In order to solve the problem that the spray-free metal-like flame-retardant PC / ABS alloy material products provided in the prior art have low appearance gloss and cannot meet the ball pressure temperature requirement of 125°C, the present invention provides a spray-free metal-like flame-retardant PC / ABS alloy material with high appearance gloss and high heat resistance and a preparation method thereof.

[0006] The present invention provides a highly heat-resistant and flame-retardant metal-like PC / ABS alloy material, which is prepared from the following raw materials in the following weight percentages:

[0007] PC 60-90%, ABS 0.05-30%, compatibilizer 0.1-10%, flame retardant 1-30%, anti-dripping agent 0.05-10%, nano-grade hardener 0.01-10%, antioxidant 0.1-0.5%, modified aluminum powder 0.001-5%, modified pearl powder 0.001-5%, color powder 0.0001-1%.

[0008] Preferably, the PC has a relative molecular weight of 1,000-20,000 and a glass transition temperature of 140°C or greater.

[0009] Preferably, the ABS is a bulk acrylonitrile-butadiene-styrene copolymer and / or an ABS graft polymer.

[0010] Preferably, the compatibilizer is at least one of MBS, ABS grafted maleic anhydride, SEBS or SMA copolymer.

[0011] Preferably, the flame retardant is at least one of diphenyl phosphate, organic fluoroxanthate or organosilicon flame retardant synergist.

[0012] Preferably, the anti-drip agent is at least one of polytetrafluoroethylene powder, polytetrafluoroethylene or styrene-acrylonitrile copolymer.

[0013] Preferably, the nano-scale hardener is at least one of nano-silicon carbide, nano-aluminum oxide or nano-boron nitride.

[0014] Preferably, the antioxidant is at least one of 1076, 168 or 1010.

[0015] Preferably, the modified aluminum powder is a powder surface-treated by wet coating with PE wax and a coupling agent, and the modified aluminum powder is a powder with a flaky morphology and / or a polyhedral morphology of 10-90 μm.

[0016] Preferably, the modified pearlescent powder is a powder surface-treated by wet coating with PE wax and a coupling agent, and the modified pearlescent powder is at least one of glass pearlescent, natural mica or natural mica of different colors.

[0017] Preferably, the toner is at least one of carbon black, oil black, 2B blue, ultramarine, ultramarine violet, ST yellow, titanium yellow, iron oxide red or 179 red.

[0018] The present invention also provides a method for preparing the highly heat-resistant and flame-retardant metal-like PC / ABS alloy material, comprising the following steps:

[0019] Step 1: According to the dosage ratio of PC / ABS alloy raw materials, relevant raw materials are weighed, PC, ABS, compatibilizer, flame retardant, anti-dripping agent, nano-hardener and antioxidant are poured into a high-speed mixer for mixing and dispersing for a first time to obtain a mixture, and then the mixture is extruded by a twin-screw extruder at a first extrusion temperature, cooled, and pelletized to obtain PC / ABS alloy;

[0020] Step 2: After adding white oil to the PC / ABS alloy, mixing and dispersing at high speed for a second time, adding color powder and dispersing at high speed for a third time, then adding modified aluminum powder and modified pearl powder and dispersing at high speed for the second time to obtain a mixed dispersed material, and then extruding the mixed dispersed material using a single-screw extruder at a second extrusion temperature, cooling, and pelletizing to obtain the high heat-resistant and flame-retardant imitation metal PC / ABS alloy material.

[0021] Preferably, in step 1, the first time is 15 to 16 minutes, the rotation speed of the high-speed mixer is 1000 rad / min, and the first extrusion temperature is 240-260°C.

[0022] Preferably, the second time is 5 to 6 minutes, the third time is 10 to 11 minutes, and the second extrusion temperature is 240°C.

[0023] Preferably, the modified aluminum powder is prepared as follows: a certain amount of liquid paraffin and a coupling agent are dissolved in a solution of ethanol at 50-90°C, and then aluminum powder of at least one morphology is added to the solution, activated for 15-120 minutes and then dried to obtain the modified aluminum powder coated with a monolayer.

[0024] Preferably, the modified pearlescent powder is prepared by dissolving a certain amount of liquid paraffin and a coupling agent in ethanol at 50-90° C., adding at least one color of pearlescent to the solution, activating for 15-120 minutes, and then drying to obtain the modified pearlescent powder coated with a monolayer.

[0025] The highly heat-resistant, flame-retardant, metal-like PC / ABS alloy material provided by the present invention incorporates a nano-scale hardener flame-retardant formulation, significantly enhancing the heat resistance and surface hardness of the PC / ABS alloy, achieving a ball pressure temperature of 125°C and a flame retardancy of 1.5 mm V0. Specifically, the addition of specially prepared modified aluminum powder, modified pearlescent powder, and color powder to the flame-retardant PC / ABS alloy creates a new material system. The second step in the process utilizes a shear-free single-screw extrusion process to disperse the mixture, increasing powder toughness while reducing the shear strength of the screw on the powder. This results in a high-gloss, ball pressure-resistant, and highly flame-retardant, spray-free PC / ABS alloy material with a metal-like effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the preparation process of PC / ABS alloy material according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0028] The present invention provides a highly heat-resistant and flame-retardant metal-like PC / ABS alloy material, which is prepared from the following raw materials in the following weight percentages:

[0029] PC 60-90%, ABS 0.05-30%, compatibilizer 0.1-10%, flame retardant 1-30%, anti-dripping agent 0.05-10%, nano-hardening agent 0.01-10%, antioxidant 0.1-0.5%, modified aluminum powder 0.001-5%, modified pearl powder 0.001-5%, color powder 0.0001-1%. Among them:

[0030] The PC has a relative molecular weight of 1,000-20,000 and a glass transition temperature of equal to or greater than 140°C.

[0031] The ABS is a bulk acrylonitrile-butadiene-styrene copolymer and / or an ABS graft polymer.

[0032] The compatibilizer is at least one of MBS, ABS grafted maleic anhydride, SEBS or SMA copolymer.

[0033] The flame retardant is at least one of diphenyl phosphate, organic fluoroxanthate or organic silicon flame retardant synergist.

[0034] The anti-drip agent is at least one of polytetrafluoroethylene powder, polytetrafluoroethylene or styrene-acrylonitrile copolymer.

[0035] The nano-scale hardener is at least one of nano-silicon carbide, nano-aluminum oxide or nano-boron nitride.

[0036] The antioxidant is at least one of 1076, 168 or 1010.

[0037] The modified aluminum powder is a powder surface-treated by wet coating with PE wax and a coupling agent. The modified aluminum powder is a powder with a flaky and / or polyhedral morphology of 10-90 μm.

[0038] The modified pearlescent powder is a powder surface-treated by wet coating with PE wax and a coupling agent. The modified pearlescent powder is at least one of glass pearlescent, natural mica or natural mica of different colors.

[0039] The toner is at least one of carbon black, oil black, 2B blue, ultramarine, ultramarine violet, ST yellow, titanium yellow, iron oxide red or 179 red.

[0040] Conventional plastic modification techniques typically employ fillers such as calcium carbonate, talc, and barium sulfate to enhance the plastic's heat resistance. Excessive amounts of these fillers can negatively impact color, reduce hardness, and weaken the material's ability to resist surface deformation. Research and testing have revealed that the nanoscale hardening inorganic powders added to the PC / ABS alloy material of the present invention exhibit high hardness. Upon addition to the resin, these powders form a continuous, dense protective layer on the alloy's surface, increasing the alloy's overall hardness and enhancing its resistance to deformation under ball pressure during heating.

[0041] The present invention also provides a method for preparing the highly heat-resistant and flame-retardant imitation metal PC / ABS alloy material, comprising the following steps: Figure 1 :

[0042] Step 1: According to the dosage ratio of PC / ABS alloy raw materials, weigh the weight of relevant raw materials, pour PC, ABS, compatibilizer, flame retardant, anti-dripping agent, nano-hardening agent and antioxidant into a high-speed mixer, mix and disperse at a speed of 1000 rad / min for 15-16 minutes to obtain a mixture, and then extrude the mixture at a temperature of 240-260°C using a twin-screw extruder, cool and pelletize to obtain PC / ABS alloy material;

[0043] Step 2: Add white oil to the PC / ABS alloy material and mix and disperse at high speed for 5 to 6 minutes, add color powder and disperse at high speed for 10 to 11 minutes, then add modified aluminum powder and modified pearl powder and disperse at high speed for 5 to 6 minutes to obtain a mixed dispersion, and then extrude the mixed dispersion at 240°C using a single-screw extruder, cool, and pelletize to obtain the highly heat-resistant and flame-retardant imitation metal PC / ABS alloy material. Wherein:

[0044] The modified aluminum powder is prepared by dissolving a certain amount of liquid paraffin and a coupling agent in ethanol at 50-90°C to prepare a solution. Flake-shaped or polyhedral aluminum powder, or both, is then added to the solution. The mixture is activated for 15-120 minutes and then dried to obtain a monolayer-coated modified aluminum powder. This specially prepared modified aluminum powder is wet-coated with PE wax and a coupling agent to increase its flexibility and shear strength, thereby enhancing the gloss of PC / ABS alloy materials.

[0045] The modified pearlescent powder is prepared by dissolving a certain amount of liquid paraffin and a coupling agent in ethanol at 50-90°C, then adding at least one color of pearlescent to the solution. The solution is activated for 15-120 minutes and then dried to obtain a monolayer-coated modified pearlescent powder. Testing has shown that the combined effect of the monolayer-coated aluminum powder and pearlescent powder significantly improves the toughness and glossiness of the resulting PC / ABS alloy.

[0046] The present invention adopts a two-step method to prepare the highly heat-resistant and flame-retardant imitation metal PC / ABS alloy material. The first step is to introduce a nano-hardening and flame-retardant formula system, and at the same time, a traditional twin-screw extruder is used to extrude the mixture. The strong shear force of the twin-screw extruder allows the various raw materials to be fully squeezed and embedded with each other, so that the heat resistance and surface hardness of the prepared PC / ABS alloy material are greatly improved, the ball pressure temperature reaches 125°C, and the flame retardancy reaches 1.5mmV0. In the second step, specially prepared modified aluminum powder and modified pearl powder, as well as color powder are added to the PC / ABS alloy material prepared in the first step to form a new material system, and then a shear-free single-screw extrusion is used as the second step process to extrude the new material system. While increasing the toughness of the powder, it also reduces the shear strength of the screw on the powder, thereby obtaining a high-gloss, ball-pressure-resistant and highly flame-retardant spray-free PC / ABS alloy material with an imitation metal effect.

[0047] The following is a preparation example of the PC / ABS alloy material provided by the present invention, and a performance test comparison is performed with different comparison columns.

[0048] Example 1

[0049] Step 1: Preparation of PC / ABS alloy: 76 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material. Herein:

[0050] The PC resin has a relative molecular weight of 1000 and a glass transition temperature of 140°C or greater. The ABS is bulk acrylonitrile-butadiene-styrene copolymer; and the nano-hardener is nano-silicon carbide. The compatibilizer, flame retardant, anti-drip agent, and antioxidant can be selected from at least one of the specified raw materials.

[0051] In the second step, 0.1%-1% white oil (based on the total amount of the raw materials) was added to the prepared PC / ABS alloy and dispersed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of modified aluminum powder and 0.42 parts of modified pearlescent pigment were then added and dispersed at high speed for 5 minutes to obtain a mixed dispersion. The mixed dispersion was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain the high-heat-resistant, flame-retardant, metal-like PC / ABS alloy material of the present invention. The following components are present:

[0052] The modified aluminum powder is a 10 μm flake powder, the modified pearl powder is glass pearl powder, and the color powder is selected from at least one of the specified raw materials.

[0053] Example 2

[0054] Step 1: Preparation of PC / ABS alloy: 60 parts PC, 22 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material. Herein:

[0055] The PC resin has a relative molecular weight of 10,000 and a glass transition temperature of 140°C or greater. The ABS is an ABS graft polymer; the nano-scale hardener is nano-alumina. The compatibilizer, flame retardant, anti-drip agent, and antioxidant can be selected from at least one of the specified raw materials.

[0056] In the second step, the prepared PC / ABS alloy was added to 0.1%-1% white oil, based on the total amount of the raw materials, and mixed and dispersed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of modified aluminum powder and 0.42 parts of modified pearlescent pigment were then added and dispersed at high speed for 5 minutes to obtain a mixed dispersion. The mixed dispersion was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain the highly heat-resistant, flame-retardant, metal-like PC / ABS alloy material of the present invention. The following components are present:

[0057] The modified aluminum powder is made of 50 μm flake and polyhedral powders, with the same amount used for both. The modified pearlescent powder is made of glass pearlescent and natural mica, with the same amount used for both. The colorant can be made of at least one of the specified raw materials.

[0058] Example 3

[0059] Step 1: Preparation of PC / ABS alloy: 90 parts PC, 0.05 parts ABS, 2.5 parts compatibilizer, 6.95 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material. Herein:

[0060] The PC resin has a relative molecular weight of 20,000 and a glass transition temperature of 140°C or greater. The ABS comprises bulk acrylonitrile-butadiene-styrene copolymer and ABS graft polymer, with both raw materials used in equal amounts. The nano-hardener comprises nano-silicon carbide, nano-aluminum oxide, and nano-boron nitride, with all three raw materials used in equal amounts. The compatibilizer, flame retardant, anti-drip agent, and antioxidant can be selected from at least one of the respective specified raw materials.

[0061] In the second step, the prepared PC / ABS alloy was added to 0.1%-1% white oil, based on the total amount of the raw materials, and mixed and dispersed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of modified aluminum powder and 0.42 parts of modified pearlescent pigment were then added and dispersed at high speed for 5 minutes to obtain a mixed dispersion. The mixed dispersion was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain the highly heat-resistant, flame-retardant, metal-like PC / ABS alloy material of the present invention. The following components are present:

[0062] The modified aluminum powder is a 90 μm polyhedral powder, the modified pearlescent powder is glass pearlescent, natural mica and natural mica, and the three raw materials are used in the same amount. The color powder can be selected from at least one of the specified raw materials.

[0063] Five comparative examples are prepared below:

[0064] Comparative Example 1

[0065] 76 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-dripping agent, 0.01 parts nano-hardener, 0.03 parts antioxidant; 0.006 parts color powder, 0.004 parts modified aluminum powder, and 0.42 parts modified pearlescent powder were weighed and dispersed at high speed for 25 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240°C, cooled, and pelletized to obtain a PC / ABS alloy material with a metallic effect.

[0066] The raw materials used in Comparative Example 1 are the same as those in the present application, and a one-step extrusion method is adopted, that is, a twin-screw extruder is used to extrude the mixed material to obtain a PC / ABS alloy material with a metal-like effect.

[0067] Comparative Example 2

[0068] Step 1: Preparation of PC / ABS alloy: 76.01 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material.

[0069] In the second step, the prepared PC / ABS alloy material was added to 0.1%-1% white oil, based on the total amount of the raw materials, and dispersed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of modified aluminum powder and 0.42 parts of modified pearlescent powder were then added and dispersed at high speed for 5 minutes to obtain a dispersed mixture. The dispersed mixture was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain a PC / ABS alloy material with a metallic effect.

[0070] In the first step of this comparative example 2, no nano-scale hardener was added, and the remaining raw materials were the same as those in the present application. A two-step method was used to prepare a PC / ABS alloy material with a metal-like effect.

[0071] Comparative Example 3

[0072] Step 1: Preparation of PC / ABS alloy: 76 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material.

[0073] In the second step, the prepared PC / ABS alloy was added with 0.006 parts of color powder, 0.004 parts of modified aluminum powder, and 0.15 parts of modified pearlescent powder and dispersed at high speed for 10 minutes to obtain a dispersed mixture. The dispersed mixture was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain a PC / ABS alloy with a metallic effect.

[0074] In the second step of this comparative example 3, no white oil was added for high-speed mixing and dispersion. The remaining raw materials were the same as those in the present application. A two-step method was used to prepare a PC / ABS alloy material with a metal-like effect.

[0075] Comparative Example 4

[0076] Step 1: Preparation of PC / ABS alloy: 76 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material.

[0077] In the second step, the prepared PC / ABS alloy material was added to 0.1%-1% white oil (based on the total amount of the raw materials) and mixed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of modified aluminum powder and 0.15 parts of modified pearlescent powder were then added and dispersed at high speed for 5 minutes to obtain a dispersed mixture. The dispersed mixture was extruded through a twin-screw extruder at 240°C, cooled, and pelletized to obtain a PC / ABS alloy material with a metallic effect.

[0078] In the first and second steps of the process of Comparative Example 4, a twin-screw extruder is used to extrude the mixed material, and the remaining raw materials are the same as those of the present application to produce a PC / ABS alloy material with a metal-like effect.

[0079] Comparative Example 5

[0080] Step 1: Preparation of PC / ABS alloy: 76 parts PC, 6 parts ABS, 2.5 parts compatibilizer, 15 parts flame retardant, 0.03 parts anti-drip agent, 0.01 parts nano-hardener, and 0.03 parts antioxidant were weighed and dispersed in a high-speed mixer at 1000 rad / min for 15 minutes to obtain a mixture. The mixture was extruded through a twin-screw extruder at 240-260°C, cooled, and pelletized to obtain a PC / ABS alloy material.

[0081] In the second step, the prepared PC / ABS alloy material was added to 0.1%-1% white oil (based on the total raw material content) and mixed at high speed for 5 minutes. 0.006 parts of color powder was added and dispersed at high speed for 10 minutes. 0.004 parts of unmodified aluminum powder and 0.15 parts of unmodified pearlescent powder were then added and dispersed at high speed for 5 minutes to form a dispersed mixture. The dispersed mixture was extruded through a single-screw extruder at 240°C, cooled, and pelletized to obtain a PC / ABS alloy material with a metallic effect.

[0082] In the second step of this comparative example 5, aluminum powder and pearl powder without surface modification, that is, traditional aluminum powder and pearl powder, are selected. The remaining raw materials are the same as those of the present application, and a two-step method is used to prepare a PC / ABS alloy material with a metal-like effect.

[0083] The following tests were conducted on the performance of the samples prepared in the three embodiments and five comparative examples of the present application.

[0084] Use the C light source or D65 light source of the colorimeter to test the color plate with a size of 50mm*50mm and a thickness of at least 2.2mm.

[0085] Use a 60-degree gloss tester to test a color plate with a specification of 50mm*50mm and a thickness of at least 2.2mm.

[0086] Tested according to GB / T 5169.21-2006, the test temperature is 110-130℃, and the dent diameter after the test is required to be ≤2.0mm.

[0087] Carry out vertical burning test according to GB / T 2408 requirements and make judgment according to corresponding criterion level.

[0088] The test results are as follows:

[0089] project Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 L value 85 85 85 84 85 84 83 84 Glossiness 95 90 95 88 96 90 86 93 Ball pressure ℃ 126 126 128 128 118 125 125 126 Flame retardant 1.5mm V0 V1 V0 V0 V0 V0 V0 V0

[0090] In the table, the L value represents the brightness of the object: 0-100 represents from black to white.

[0091] As shown in the table, Example 1 and Comparative Example 1 show that the metallic-effect PC / ABS alloy material prepared using a two-step process in Example 1 exhibits significantly better gloss than the material prepared using a one-step process in Comparative Example 1. This is because the single-screw extruder used in the second step of Example 1 reduces the shear strength of the modified pearlescent powder and modified aluminum powder, resulting in better dimensional integrity of the powder.

[0092] Comparative Example 2 shows that removing the nanohardener significantly reduces the alloy's ball pressure temperature. This demonstrates that the nanohardener effectively improves ball pressure resistance by forming a protective layer on the raw material powder, thereby increasing the material's overall hardness. Furthermore, the nanohardener layer is less likely to collapse at high temperatures. However, the presence of the nanohardener layer also affects gloss.

[0093] Comparative Example 3 shows that the high-speed mixing and dispersion without the addition of white oil in the second step significantly affects the glossiness. Specifically, the high-speed dispersion process easily breaks the aluminum flakes or pearlescent flakes, reducing their reflective surface and lowering the glossiness.

[0094] In Comparative Example 4, the glossiness of the material significantly decreased after the second twin-screw extrusion process. This indicates that the shear strength of the twin-screw has a significant impact on pearlescent powder and aluminum powder, making them unsuitable for the twin-screw process.

[0095] Comparative Example 5, using unmodified pearlescent powder and aluminum powder, resulted in reduced gloss. Because the aluminum and pearlescent powders have unmodified surfaces, they have poor heat resistance. During high-speed dispersion or conveying in a single-screw extruder, some of the aluminum and pearlescent powders were sheared off, resulting in reduced gloss.

[0096] The present invention introduces a nano-hardened flame-retardant formulation system into PC / ABS alloy materials, significantly improving the heat resistance and surface hardness of the PC / ABS alloy material, achieving a ball pressure temperature of 125°C and a flame retardancy of 1.5mmV0. The addition of surface-modified aluminum powder, modified pearlescent powder, and color powder to the PC / ABS alloy material creates a new material system, and the use of a shear-free single-screw extrusion process in the second step increases powder toughness while reducing the shear strength of the screw on the powder. This results in a spray-free, high-gloss, and highly heat-resistant, flame-retardant, metallic-like PC / ABS alloy material.

[0097] The above descriptions are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A highly heat-resistant and flame-retardant imitation metal PC / ABS alloy material, characterized in that: It is prepared from the following raw materials in percentage by weight: PC 60-90%, ABS 0.05-30%, compatibilizer 0.1-10%, flame retardant 1-30%, anti-dripping agent 0.05-10%, Nano-grade hardener 0.01-10%, antioxidant 0.1-0.5%, modified aluminum powder 0.001-5%, modified pearl powder 0.001-5%, color powder 0.0001-1%; including: The nano-scale hardener is at least one of nano-silicon carbide, nano-aluminum oxide or nano-boron nitride; The modified aluminum powder is a powder surface-treated by wet coating with PE wax and a coupling agent, and the modified aluminum powder is a powder with a flaky morphology and / or a polyhedral morphology of 10-90 μm. The modified pearlescent powder is a powder surface-treated by wet coating with PE wax and a coupling agent, and the modified pearlescent powder is at least one of glass pearlescent, natural mica or natural mica of different colors; The method for preparing the highly heat-resistant and flame-retardant imitation metal PC / ABS alloy material comprises the following steps: Step 1: According to the ratio of PC / ABS alloy raw materials, the weight of relevant raw materials is weighed, PC, ABS, compatibilizer, flame retardant, anti-dripping agent, nano-hardener and antioxidant are poured into a high-speed mixer for mixing and dispersing for a first time to obtain a mixture, and the mixture is extruded by a twin-screw extruder at a first extrusion temperature, cooled, and pelletized to obtain a PC / ABS alloy material; Step 2: After adding white oil to the PC / ABS alloy, mixing and dispersing at high speed for a second time, adding color powder and dispersing at high speed for a third time, then adding the modified aluminum powder and modified pearl powder and dispersing at high speed for the second time to obtain a mixed dispersed material, extruding the mixed dispersed material using a single-screw extruder at a second extrusion temperature, cooling, and pelletizing to obtain the high heat-resistant and flame-retardant imitation metal PC / ABS alloy material.

2. The alloy material according to claim 1, wherein The relative molecular weight of the PC is 1,000-20,000, and the glass transition temperature is equal to or greater than 140°C.

3. The alloy material according to claim 1, wherein The ABS is a bulk acrylonitrile-butadiene-styrene copolymer and / or an ABS graft polymer.

4. The alloy material according to claim 1, wherein The compatibilizer is at least one of MBS, ABS grafted maleic anhydride, SEBS or SMA copolymer.

5. The alloy material according to claim 1, wherein The flame retardant is at least one of diphenyl phosphate, organic fluoroxanthate or organic silicon flame retardant synergist.

6. The alloy material according to claim 1, wherein The anti-drip agent is at least one of polytetrafluoroethylene powder, polytetrafluoroethylene or styrene-acrylonitrile copolymer.

7. The alloy material according to claim 1, wherein The antioxidant is at least one of 1076, 168 or 1010.

8. The alloy material according to claim 1, wherein The toner is at least one of carbon black, oil black, 2B blue, ultramarine, ultramarine violet, ST yellow, titanium yellow, iron oxide red or 179 red.

9. The alloy material according to claim 1, wherein In the step 1, the first time is 15-16 minutes, the rotation speed of the high-speed mixer is 1000 rad / min, and the first extrusion temperature is 240-260°C.

10. The alloy material according to claim 1, wherein The second time is 5-6 minutes, the third time is 10-11 minutes, and the second extrusion temperature is 240°C.

11. The alloy material according to claim 1, wherein The modified aluminum powder is prepared as follows: liquid PE wax and a coupling agent are dissolved in ethanol at 50-90° C. to obtain a solution, and then aluminum powder of at least one morphology is added to the solution, activated for 15-120 minutes, and then dried to obtain the modified aluminum powder coated with a monolayer.

12. The alloy material according to claim 1, wherein The modified pearlescent powder is prepared by dissolving liquid PE wax and a coupling agent in ethanol at 50-90° C. to obtain a solution, adding pearlescent powder of at least one color to the solution, activating the solution for 15-120 minutes, and then drying the solution to obtain the modified pearlescent powder coated with a monolayer.

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