High-gloss high-impact-strength PC / ABS alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a high-gloss high-impact-strength PC / ABS alloy material and a preparation method thereof. The PC / ABS alloy material comprises the following components: PC, ABS resin, maleic anhydride, a phosphite antioxidant, a flame retardant, an organic tin stabilizer, lubricating wax and an additive. The preparation method comprises the following steps: premixing the PC and the compatilizer maleic anhydride, simultaneously premixing the ABS, the antioxidant, the stabilizer and the lubricating wax, mixing the PC and the compatilizer maleic anhydride, adding the flame retardant and the additive, uniformly mixing, mixing and extruding at 240-260 DEG C, and homogenizing to obtain the product. According to the invention, the contradiction between the impact strength and glossiness of the existing PC / ABS alloy material is solved, so that the alloy material not only has high glossiness, but also has the characteristic of high impact strength, the application range of the material is expanded, and the alloy material is more suitable for forming electric appliances and automobile parts, and is also suitable for forming and processing some high-grade products.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-gloss and high-impact strength PC / ABS alloy material and a preparation method thereof. Background Art

[0002] With the development of social economy and the improvement of consumers' demand for product functionality, higher requirements are put forward for the performance of PC / ABS alloy materials. The existing technology produces PC / ABS alloy, which is formed by mixing and grafting PC polycarbonate, rubber powder, etc. The resulting alloy material has a contradiction between impact strength and gloss performance. While improving gloss, it often causes a decrease in impact strength, and the material performance is compromised. This solution is compatible with high strength and high gloss performance, and expands the application range of the material. The existing technology has the problem that the gloss of the product application is improved, and the impact strength will be reduced. The material performance is compromised, which limits the application field of the product. Summary of the invention

[0003] In view of the problem that the common PC / ABS alloy materials currently have difficulty in having both excellent glossiness and impact strength, the present invention aims to provide a high-gloss and high-impact strength PC / ABS alloy material and a preparation method thereof.

[0004] The purpose of the present invention is to provide a PC / ABS alloy material with high gloss and high impact strength.

[0005] A high-gloss and high-impact strength PC / ABS alloy material comprises the following components by weight: 70-75 parts of PC polycarbonate, 13-17 parts of ABS resin, 0.5-1 parts of maleic anhydride, 0.2-0.5 parts of phosphite antioxidant, 15-17 parts of flame retardant, 0.1-0.2 parts of organic tin stabilizer, 1-1.5 parts of lubricating wax, and 3-7 parts of additives.

[0006] Furthermore, the phosphite antioxidant is any one of pentaerythritol distearyl diphosphite, tri[2.4-di-tert-butylphenyl]phosphite and antioxidant 1076.

[0007] Furthermore, the flame retardant is prepared by mixing ammonium polyphosphate and silicone oil in a mass ratio of 4 to 9:1.

[0008] Furthermore, the organic tin stabilizer is prepared by mixing dibutyltin maleate and zinc stearate in a mass ratio of 12 to 20:1.

[0009] Furthermore, the additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:1 to 2; the structure of the sodium polyacrylate is a branched structure.

[0010] Furthermore, the method for preparing the alloy material comprises the following steps:

[0011] Take each component according to the above weight proportion, first premix PC polycarbonate and maleic anhydride, and at the same time premix ABS resin, antioxidant, stabilizer, and lubricating wax, and then mix the two to obtain a mixture, add the mixture into a ball mill, ball mill, then add flame retardant and additives to mix and ball mill evenly, put it into a twin-screw extruder for mixing, control the temperature at 240-260° C. for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

[0012] Furthermore, the ball milling process is to add 0.1-0.5% of the mass of the mixed material into magnesium carbonate, use silicon nitride as the ball milling medium, and ball mill at 300-500 r / min for 2-4 hours.

[0013] Furthermore, the mixing conditions in the twin-screw extruder include: a rotation speed of 90 r / min to 150 r / min, and stirring for 20 min to 40 min; the melt extrusion conditions include: the temperatures of the twin-screw extruder from the feed port to the die outlet are 200°C to 220°C, 210°C to 230°C, 230°C to 260°C, 220°C to 250°C, and 220°C to 250°C, respectively, and the die head temperature is 240°C to 260°C; the twin screw speed of the twin-screw extruder is 350 r / min to 500 r / min.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) The PC / ABS alloy obtained by the present invention has high glossiness and an impact resistance of 55, which is not only more suitable for molding processing, but also has high gloss surface performance, is more suitable for color matching, and is suitable for use as a notebook computer shell, smart car instrument, etc.;

[0016] (2) The preparation method of the present invention is to premix PC polycarbonate and compatibilizer maleic anhydride, and premix ABS, antioxidant, stabilizer, and lubricating wax, and then mix the two and add flame retardant and additives to mix evenly, mix and extrude at a temperature of 240 to 260° C., and obtain the product after homogenization;

[0017] (3) In the process of ball milling of the mixed materials, the magnesium carbonate added in the present invention can play the role of lubrication, corrosion inhibition and adhesion prevention. Magnesium carbonate can be decomposed into magnesium oxide and carbon dioxide, which can be combined with lubricating wax to form a thin film on the surface of the ball mill material, further improving the lubricity, thereby improving the ball milling efficiency and improving the glossiness. The fatty alcohol polyoxyethylene ether sodium sulfate and sodium polyacrylate in the additives contain hydrophobic groups and hydrophilic groups on their molecular chains, which can be adsorbed between the ball mill materials through hydrogen bonding, and mainly adsorbed around the interlayers with weaker negative charge, significantly improving the charge density and electrostatic repulsion, thereby effectively improving the dispersion uniformity of the main components, reducing the occurrence of disordered stacking, and making the alloy material more uniform. In the transmission of external force and light, the surface and internal structure can be better controlled after mixing and extrusion, which can be more conducive to the dissipation of force and the propagation of light. The use of branched sodium polyacrylate can also improve the overall strength of the alloy material, thereby comprehensively improving the mechanical strength and optical properties of the alloy material. DETAILED DESCRIPTION

[0018] The following provides a specific embodiment of a high-gloss and high-impact strength PC / ABS alloy material and a preparation method thereof. It is necessary to point out that the following examples are only used to illustrate the present invention in more detail, rather than to narrow the protection scope of the present invention. After reading the present invention, improvements and adjustments made by professionals in the technical field without departing from the concept of the present invention are within the scope of protection claimed by the present invention.

[0019] A high-gloss and high-strength PC / ABS alloy material comprises the following components by weight: 70-75 parts of PC polycarbonate, 13-17 parts of ABS resin, 0.5-1 parts of maleic anhydride, 0.2-0.5 parts of phosphite antioxidant, 15-17 parts of flame retardant, 0.1-0.2 parts of organic tin stabilizer, 1-1.5 parts of lubricating wax, and 3-7 parts of additives.

[0020] Phosphite antioxidant: any one of pentaerythritol distearyl diphosphite, tris[2,4-di-tert-butylphenyl]phosphite and antioxidant 1076.

[0021] Flame retardant: Mix ammonium polyphosphate and silicone oil in a mass ratio of 4 to 9:1.

[0022] Organic tin stabilizer: Mix dibutyltin maleate and zinc stearate in a mass ratio of 12 to 20:1.

[0023] The additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:1-2, wherein the sodium polyacrylate adopts a branched structure.

[0024] A method for preparing a high-gloss and high-strength PC / ABS alloy material comprises the following steps:

[0025] Take each component according to the above weight proportions, first premix PC polycarbonate and maleic anhydride, and at the same time premix ABS resin, antioxidant, stabilizer, and lubricating wax, and then mix the two to obtain a mixture, add the mixture into a ball mill, and add 0.1-0.5% of magnesium carbonate by weight of the mixture, mix with silicon nitride as the ball milling medium, and ball mill at 300-500r / min for 2-4h, then add flame retardant and additives, mix and ball mill evenly, put into a twin-screw extruder for mixing, control the temperature at 240-260°C for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

[0026] Among them, the mixing conditions in the twin-screw extruder include: a rotation speed of 90r / min~150r / min, stirring for 20min~40min; the screw diameter of the twin-screw extruder is 40mm, and the aspect ratio L / D is 44; the melt extrusion conditions include: the temperature of the twin-screw extruder from the feeding port to the head outlet is 200℃~220℃, 210℃~230℃, 230℃~260℃, 220℃~250℃, 220℃~250℃, and the die head temperature is 240℃~260℃; the twin screw speed of the twin-screw extruder is 350r / min~500r / min.

[0027] Example 1

[0028] A high-gloss and high-strength PC / ABS alloy material comprises the following components by weight: 70 parts of PC polycarbonate, 13 parts of ABS resin, 0.5 parts of maleic anhydride, 0.2 parts of phosphite antioxidant, 15 parts of flame retardant, 0.1 parts of organic tin stabilizer, 1 part of lubricating wax, and 3 parts of additives.

[0029] Phosphite antioxidant: Pentaerythritol distearyl diphosphite.

[0030] Flame retardant: Mix ammonium polyphosphate and silicone oil in a mass ratio of 4:1.

[0031] Organic tin stabilizer: Mix dibutyltin maleate and zinc stearate in a mass ratio of 12:1.

[0032] The additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:1, wherein the sodium polyacrylate adopts a branched structure.

[0033] A method for preparing a high-gloss and high-strength PC / ABS alloy material comprises the following steps:

[0034] Take each component according to the above weight proportion, first premix PC polycarbonate and maleic anhydride, and premix ABS resin, antioxidant, stabilizer and lubricating wax, then mix the two to obtain a mixture, add the mixture into a ball mill, and add 0.1% magnesium carbonate by weight of the mixture, mix with silicon nitride as the ball milling medium, and ball mill at 300r / min for 3h, then add flame retardant and additives, mix and ball mill evenly, put into a twin-screw extruder for mixing, control the temperature at 240-260℃ for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

[0035] Among them, the mixing conditions in the twin-screw extruder include: a rotation speed of 90r / min to 150r / min, and stirring for 20min to 40min; the screw diameter of the twin-screw extruder is 40mm, and the aspect ratio L / D is 44; the melt extrusion conditions include: the temperature of the twin-screw extruder from the feed port to the head outlet is 200℃ to 220℃, 210℃ to 230℃, 230℃ to 260℃, 220℃ to 250℃, 220℃ to 250℃, and the die head temperature is 240℃ to 260℃; the twin screw speed of the twin-screw extruder is 400r / min.

[0036] Example 2

[0037] A high-gloss and high-strength PC / ABS alloy material comprises the following components by weight: 75 parts of PC polycarbonate, 17 parts of ABS resin, 1 part of maleic anhydride, 0.5 parts of phosphite antioxidant, 17 parts of flame retardant, 0.2 parts of organic tin stabilizer, 1.5 parts of lubricating wax, and 7 parts of additives.

[0038] Phosphite antioxidant: Pentaerythritol distearyl diphosphite.

[0039] Flame retardant: Mix ammonium polyphosphate and silicone oil in a mass ratio of 9:1.

[0040] Organic tin stabilizer: Mix dibutyltin maleate and zinc stearate in a mass ratio of 20:1.

[0041] The additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:2, wherein the sodium polyacrylate adopts a branched structure.

[0042] A method for preparing a high-gloss and high-strength PC / ABS alloy material comprises the following steps:

[0043] Take each component according to the above weight proportions, first premix PC polycarbonate and maleic anhydride, and premix ABS resin, antioxidant, stabilizer, and lubricating wax, then mix the two to obtain a mixture, add the mixture into a ball mill, and add 0.5% magnesium carbonate by weight of the mixture, mix with silicon nitride as the ball milling medium, and ball mill at 500r / min for 4h, then add flame retardant and additives, mix and ball mill evenly, put into a twin-screw extruder for mixing, control the temperature at 240-260℃ for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

[0044] Among them, the mixing conditions in the twin-screw extruder include: a rotation speed of 90r / min~150r / min, stirring for 20min~40min; the screw diameter of the twin-screw extruder is 40mm, and the aspect ratio L / D is 44; the melt extrusion conditions include: the temperature of the twin-screw extruder from the feeding port to the head outlet is 200℃~220℃, 210℃~230℃, 230℃~260℃, 220℃~250℃, 220℃~250℃, and the die head temperature is 240℃~260℃; the twin screw speed of the twin-screw extruder is 500r / min.

[0045] Example 3

[0046] A high-gloss and high-strength PC / ABS alloy material comprises the following components by weight: 72 parts of PC polycarbonate, 15 parts of ABS resin, 0.8 parts of maleic anhydride, 0.4 parts of phosphite antioxidant, 16 parts of flame retardant, 0.1 parts of organic tin stabilizer, 1 part of lubricating wax, and 5 parts of additives.

[0047] Phosphite antioxidant: Pentaerythritol distearyl diphosphite.

[0048] Flame retardant: Mix ammonium polyphosphate and silicone oil in a mass ratio of 6:1.

[0049] Organic tin stabilizer: Mix dibutyltin maleate and zinc stearate in a mass ratio of 18:1.

[0050] The additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:2, wherein the sodium polyacrylate adopts a branched structure.

[0051] A method for preparing a high-gloss and high-strength PC / ABS alloy material comprises the following steps:

[0052] Take each component according to the above weight proportion, first premix PC polycarbonate and maleic anhydride, and premix ABS resin, antioxidant, stabilizer and lubricating wax, then mix the two to obtain a mixture, add the mixture into a ball mill, and add 0.4% magnesium carbonate by weight of the mixture, use silicon nitride as a ball milling medium, and ball mill for 3 hours at 400r / min, then add flame retardant and additives, mix and ball mill evenly, put into a twin-screw extruder for mixing, control the temperature at 240-260°C for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

[0053] Among them, the mixing conditions in the twin-screw extruder include: a rotation speed of 90r / min to 150r / min, and stirring for 20min to 40min; the screw diameter of the twin-screw extruder is 40mm, and the aspect ratio L / D is 44; the melt extrusion conditions include: the temperature of the twin-screw extruder from the feed port to the head outlet is 200℃ to 220℃, 210℃ to 230℃, 230℃ to 260℃, 220℃ to 250℃, 220℃ to 250℃, and the die head temperature is 240℃ to 260℃; the twin screw speed of the twin-screw extruder is 400r / min.

[0054] Comparative Example 1 is substantially the same as Example 3, except that the additive is absent.

[0055] Comparative Example 2 is substantially the same as Example 3, except that an organotin stabilizer is absent.

[0056] Comparative Example 3 is traditional PC / ABS.

[0057] (Note: in terms of mass fraction, the conventional PC / ABS is regarded as 72 parts in terms of mass fraction, and comparative examples 4 to 6 are added or reduced with reference to this mass fraction).

[0058] Comparative Example 4 is based on Comparative Example 3, and 1 part of lubricating wax is added.

[0059] Comparative Example 5 is based on Comparative Example 4 except that 1 part of maleic anhydride is added.

[0060] The materials obtained in Examples 1 to 3 and Comparative Examples 1 to 5 were made into cantilevers of the same type according to the same process and parameters, and the physical properties such as fluidity (melt index) and Rockwell hardness were tested to obtain the physical property data shown in Table 1 below:

[0061] Table 1. Data table after testing

[0062]

[0063] From the test data, it can be seen that the performance obtained in Examples 1 to 3 is significantly better than that in Comparative Examples 1 to 5. Comparative Examples 1 and 2 omit the key components based on Example 3, resulting in the degradation of the arm impact strength, melt index, and glossiness, especially the glossiness data is more obvious, which shows that the additive plays a key role. Comparative Examples 3 to 5 are improved tests based on traditional PC / ABS. After improvement evaluation, it is found that the melt index shows an upward trend, which shows that lubricating wax and maleic anhydride play an important role in this alloy material.

[0064] The improved solution provided by the present invention increases the melt index from 14g / 10min to about 20g / 10min, and at the same time greatly improves the cantilever beam impact strength to about 54kgf.cm / cm, and the glossiness is maintained at about 99, which is a significant improvement over the existing technology.

[0065] Of course, it should be understood that the above data are the performance required for making cantilevers. When applied to other products, the overall performance can be adjusted within the above-mentioned range of formula values ​​according to needs, and will not be repeated here.

[0066] Note: The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention; therefore, although this specification has described the present invention in detail with reference to the above embodiments, a person skilled in the art should understand that the present invention can still be modified or replaced by equivalents; and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A high gloss and high impact strength PC / ABS alloy material, characterized in that: The invention comprises the following components by weight: 70 to 75 parts of PC polycarbonate, 13 to 17 parts of ABS resin, 0.5 to 1 part of maleic anhydride, 0.2 to 0.5 part of phosphite antioxidant, 15 to 17 parts of flame retardant, 0.1 to 0.2 part of organic tin stabilizer, 1 to 1.5 parts of lubricating wax and 3 to 7 parts of additives.

2. The high gloss and high impact strength PC / ABS alloy material according to claim 1, characterized in that: The phosphite antioxidant is any one of pentaerythritol distearyl diphosphite, tris[2.4-di-tert-butylphenyl]phosphite and antioxidant 1076.

3. The high gloss and high impact strength PC / ABS alloy material according to claim 1, characterized in that: The flame retardant is prepared by mixing ammonium polyphosphate and silicone oil in a mass ratio of 4 to 9:

1.

4. The high gloss and high impact strength PC / ABS alloy material according to claim 1, characterized in that: The organotin stabilizer is a mixture of dibutyltin maleate and zinc stearate in a mass ratio of 12 to 20:

1.

5. The high gloss and high impact strength PC / ABS alloy material according to claim 1, characterized in that: The additive is a combination of sodium fatty alcohol polyoxyethylene ether sulfate and sodium polyacrylate in a mass ratio of 5:1-2; the structure of the sodium polyacrylate is a branched structure.

6. A method for preparing a high gloss and high impact strength PC / ABS alloy material as claimed in any one of claims 1 to 5, characterized in that: The preparation method of the alloy material comprises the following steps: Take each component according to the above weight proportion, first premix PC polycarbonate and maleic anhydride, and premix ABS resin, antioxidant, stabilizer and lubricating wax, then mix the two to obtain a mixture, ball-mill the mixture, add flame retardant and additives, mix and mill evenly, put it into a twin-screw extruder for mixing, control the temperature at 240-260° C. for mixing and extrusion, pull strips, granulate, and homogenize the alloy material.

7. The method for preparing the high gloss and high impact strength PC / ABS alloy material according to claim 6, characterized in that: The ball milling process comprises adding 0.1-0.5% of magnesium carbonate by weight of the mixed material, using silicon nitride as the ball milling medium, and ball milling at 300-500 r / min for 2-4 hours.

8. The method for preparing the high gloss and high impact strength PC / ABS alloy material according to any one of claim 6, characterized in that: The mixing conditions in the twin-screw extruder include: a rotation speed of 90 r / min to 150 r / min, and stirring for 20 min to 40 min; the melt extrusion conditions include: the temperatures from the feed port to the die outlet of the twin-screw extruder are 200°C to 220°C, 210°C to 230°C, 230°C to 260°C, 220°C to 250°C, and 220°C to 250°C, respectively, and the die head temperature is 240°C to 260°C; the twin screw rotation speed of the twin-screw extruder is 350 r / min to 500 r / min.

Images