High-toughness mute HIPS (High Impact Polystyrene) composite material and preparation method thereof

Abstract

The invention discloses a high-toughness mute HIPS composite material and a preparation method thereof, and belongs to the technical field of high polymer material modification. The HIPS composite material is prepared from 75 to 90 parts by weight of HIPS resin, 5 to 15 parts by weight of PU resin, 5 to 10 parts by weight of a compatilizer, 0.2 to 0.5 part by weight of an antioxidant and 0.5 to 0.8 part by weight of a lubricant. The PU resin with good damping performance is added into the HIPS resin, and meanwhile, a two-phase interface has a damping effect on sound transmission, so that the HIPS composite material with a mute function can be obtained. Due to the fact that the compatibility of HIPS and PU is poor, the styrene-glycidyl methacrylate (PS-g-GMA) copolymer can react with polyurethane active groups, the effects of compatibilizing and reducing interfacial tension are achieved, and therefore the PU resin can have the toughening effect on the HIPS composite material.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a high-toughness and silent HIPS composite material and a preparation method thereof. Background Art

[0002] HIPS material is a two-phase system consisting of a rubber phase and a continuous polystyrene phase. It has excellent impact resistance and processing performance, making it one of the most important polymer commodities in the world. This material is widely used in many fields, including automobiles, home appliances, equipment, electronic communications, etc. However, due to changes in ambient temperature, assembly or force, polymer materials often generate noise during use, thus affecting the user experience; common solutions include reducing the contact area of ​​the material, applying velvet, adding lubrication, etc. These methods can reduce noise, but the operation is complicated, the labor cost is high, and the long-term effectiveness is difficult to guarantee. With the improvement of people's quality of life, silent materials have also become the demand of the majority of customers. Therefore, in order to make HIPS materials more widely used, it is of great significance to modify HIPS resin to make it have good silent performance. Summary of the invention

[0003] One of the purposes of the present invention is to provide a high-toughness and silent HIPS composite material to solve the problem that the HIPS material in the background technology has poor toughness and generates high noise;

[0004] A second object of the present invention is to provide a method for preparing a high-toughness and silent HIPS composite material.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] In the first aspect, a high-toughness and silent HIPS composite material comprises the following raw materials in parts by weight:

[0007]

[0008]

[0009] Furthermore, the HIPS resin is a styrene-butadiene copolymer, and the butadiene content is 6-9% by weight; at 200° C. / 5kg, the melt flow rate of the HIPS resin is 3-8 g / 10 min.

[0010] Furthermore, the PU resin is polyester polyurethane.

[0011] Furthermore, the compatibilizer is styrene-glycidyl methacrylate (PS-g-GMA) copolymer.

[0012] Furthermore, the antioxidant is any one of didodecyl thiodipropionate, octadecyl propionate, and tris(2,4-di-tert-butylphenyl) phosphite, or a combination of any two thereof.

[0013] Furthermore, the lubricant is any one of calcium stearate, pentaerythritol tetrastearate, and ethylene bisstearamide, or a combination of any two thereof.

[0014] In a second aspect, a method for preparing a high-toughness and silent HIPS composite material comprises the following steps:

[0015] S1. The HIPS resin, PU resin, PS-g-GMA, antioxidant and lubricant are placed in a high-speed mixer and mixed thoroughly to obtain a premix;

[0016] S2. Place the premix in a screw extruder, preheat for 3 to 8 minutes, and melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material.

[0017] Furthermore, the mixing temperature of the premix is ​​55-65°C.

[0018] Furthermore, the temperatures of each section of the screw extruder are 160-180°C, 170-190°C, 180-200°C, 190-210°C, 200-220°C, 210-220°C, 220-230°C, 220-230°C, and the die head temperature is 230-240°C.

[0019] Furthermore, the rotation speed of the screw extruder is 400-600 r / min.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a high-toughness silent HIPS composite material and a preparation method thereof. By adding a high-damping PU resin into the HIPS composite material, a damping effect is produced on the two-phase interface for sound transmission, thereby obtaining a HIPS composite material with a silent function. Since HIPS and PU have poor compatibility, and a styrene-glycidyl methacrylate (PS-g-GMA) copolymer is used as a linear main chain, and epoxy groups are irregularly distributed on the main chain, which can be used to compatibilize an incompatible blending system with reactive functional groups, thereby achieving a reaction with polyurethane active groups, playing a role of compatibilization and reducing interfacial tension, and further enabling the PU resin to play a role of toughening the HIPS composite material. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the following examples and comparative examples, the HIPS resin is selected from Chimei PH-88;

[0024] The PU resin was selected from Covestro TPU 3385A from Germany.

[0025] Example 1

[0026] A method for preparing a high-toughness and silent HIPS composite material comprises the following steps:

[0027] S1. Weigh the raw materials of each component according to the weight proportion, and place 90 parts of HIPS resin, 5 parts of PU resin, 5 parts of PS-g-GMA polymer, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of ethylene bisstearamide in a high-speed mixer and mix them thoroughly at a temperature of 60 ° C to obtain a premix;

[0028] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0029] Example 2

[0030] A method for preparing a high-toughness and silent HIPS composite material comprises the following steps:

[0031] S1. Weigh the raw materials of each component according to the weight proportion, and place 85 parts of HIPS resin, 10 parts of PU resin, 7 parts of PS-g-GMA polymer, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of pentaerythritol tetrastearate in a high-speed mixer and mix them thoroughly at a temperature of 60 ° C to obtain a premix;

[0032] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0033] Example 3

[0034] A method for preparing a high-toughness and silent HIPS composite material comprises the following steps:

[0035] S1. Weigh the raw materials of each component according to the weight proportion, and place 75 parts of HIPS resin, 15 parts of PU resin, 10 parts of PS-g-GMA polymer, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of pentaerythritol tetrastearate in a high-speed mixer and mix them thoroughly at a temperature of 60 ° C to obtain a premix;

[0036] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0037] Comparative Example 1

[0038] A method for preparing a HIPS composite material comprises the following steps:

[0039] S1. Weigh the raw materials of each component in parts by weight, place 100 parts of HIPS resin, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of ethylene bisstearamide in a high-speed mixer and mix thoroughly at a temperature of 60 ° C to obtain a premix;

[0040] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0041] Comparative Example 2

[0042] A method for preparing a HIPS composite material comprises the following steps:

[0043] S1. Weigh the raw materials of each component according to the weight proportion, place 95 parts of HIPS resin, 5 parts of PS-g-GMA copolymer, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of ethylene bisstearamide in a high-speed mixer and mix thoroughly at a temperature of 60 ° C to obtain a premix;

[0044] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0045] Comparative Example 3

[0046] A method for preparing a HIPS composite material comprises the following steps:

[0047] S1. Weigh the raw materials of each component in parts by weight, place 90 parts of HIPS resin, 10 parts of PU resin, 0.5 parts of didodecyl thiodipropionate and 0.4 parts of ethylene bisstearamide in a high-speed mixer and mix thoroughly at a temperature of 60 ° C to obtain a premix;

[0048] S2. Place the premix in a screw extruder, preheat for 5 minutes, melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material; the temperatures of each section of the screw extruder are: 160℃, 180℃, 180℃, 190℃, 200℃, 210℃, 220℃, 220℃, and the die head temperature is 230℃; the screw speed is 400r / min.

[0049] The comparison of the above examples and comparative examples is shown in Table 1.

[0050] Table 1

[0051]

[0052]

[0053] Performance Testing

[0054] The HIPS composite materials prepared in the above Examples 1-3 and Comparative Examples 1-3 were tested for their elongation at break (GB / T 1040) and impact strength (GB / T 1843) using the corresponding national standards. For the noise test, a 150*150*3mm plastic plate was placed on the test machine, and then another plastic plate of the same type was placed vertically and loaded with 1kg. The machine was started to make the vertical plastic plate move back and forth at a rate of 2mm / s, and the sound wave data was recorded with a sensor. The test data are shown in Table 2:

[0055] Table 2

[0056] Elongation at break (%) <![CDATA[Impact strength (Kj / m 2 )]]> Noise(dB) Example 1 40 15 50 Example 2 45 17 46 Example 3 50 19 43 Comparative Example 1 25 10 78 Comparative Example 2 23 9 77 Comparative Example 3 15 6 65

[0057] As can be seen from Table 2, compared with the test results of Examples 1-3 and Comparative Examples 1-3, compared with Comparative Example 1 (without adding PU resin and PS-g-GMA copolymer), the toughness of Examples 1-3 is significantly increased, and the noise reduction effect is obvious; in Comparative Example 2, PU resin is not added, and the toughness and noise are not much different from those of Comparative Example 1; in Comparative Example 3, PS-g-GMA copolymer is not added, and the toughness is significantly reduced due to poor compatibility between PU and HIPS.

[0058] In summary, by adding PU resin to the HIPS resin system, the two-phase interface produces a damping effect on sound transmission, and the PS-g-GMA copolymer is further used to improve the interfacial compatibility of PU resin and HIPS resin. Through a simple and easy-to-operate preparation method, the prepared HIPS composite material has excellent toughness and silent function.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-toughness silent HIPS composite material, characterized in that: According to weight parts, it includes the following raw materials:

2. The high-toughness and silent HIPS composite material according to claim 1, characterized in that: The HIPS resin is a styrene-butadiene copolymer, and the butadiene content is 6-9% by weight; under the condition of 200° C. / 5kg, the melt flow rate of the HIPS resin is 3-8g / 10min.

3. The high-toughness and silent HIPS composite material according to claim 1, characterized in that: The compatibilizer is styrene-glycidyl methacrylate copolymer.

4. The high-toughness and silent HIPS composite material according to claim 1, characterized in that: The antioxidant is any one of didodecyl thiodipropionate, octadecyl propionate, and tris(2,4-di-tert-butylphenyl) phosphite, or a combination of any two thereof.

5. The high-toughness and silent HIPS composite material according to claim 1, characterized in that: The lubricant is any one of calcium stearate, pentaerythritol tetrastearate, and ethylene bisstearamide, or a combination of any two thereof.

6. A method for preparing the high-toughness and silent HIPS composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. The HIPS resin, PU resin, PS-g-GMA, antioxidant and lubricant are mixed to obtain a premix; S2. Place the premix in a screw extruder, preheat for 3 to 8 minutes, and melt-extrude and granulate to obtain a high-toughness and silent HIPS composite material.

7. The method for preparing a high-toughness and silent HIPS composite material according to claim 6, characterized in that: The mixing temperature of the premix in S1 is 55-65°C.

8. The method for preparing a high-toughness and silent HIPS composite material according to claim 6, characterized in that: The temperatures of the various sections of the screw extruder are respectively 160-180°C, 170-190°C, 180-200°C, 190-210°C, 200-220°C, 210-220°C, 220-230°C, 220-230°C, and the die head temperature is 230-240°C.

9. The method for preparing a high-toughness and silent HIPS composite material according to claim 6, characterized in that: The rotation speed of the screw extruder is 400-600 r / min.

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