High-impact PCR PC / ABS material and preparation method thereof

Abstract

The application discloses a high-impact PCR PC / ABS material and a preparation method thereof. According to the weight percentage, the raw materials comprise PCR-PC: 50-87.5%, PCR-ABS: 10-47.5%, long-chain branched polymer: 0.5-2%, and MBS: 2-5%. The long-chain branched polymer is introduced, compounded with the terpolymer MBS, and forms the 'bridging' effect with the PCR PC / ABS polymer, so that the molecular weight of the PCR polymer can be increased, the impact strength and the melt strength of the PCR PC / ABS polymer can be significantly enhanced, the shortcomings of the low use content of the PCR PC / ABS material due to the insufficient performance of the PCR PC / ABS material are made up, and the high-content proportion application of the PCR PC / ABS material is promoted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of solid waste recycling, in particular to a high-impact PCR PC / ABS material and a preparation method thereof. BACKGROUND

[0002] Post Consumer Recycling (PCR) refers to waste plastics generated after circulation, consumption and use, mainly from daily consumption of daily chemicals, electrical appliances, automobiles and other secondary recycling plastics. Recycling and reusing it can turn industrial waste into valuable industrial raw materials and realize resource recycling.

[0003] After recycling, PCR usually needs to be crushed and soaked in alkaline solution to remove adhesives, paint and other attachments; but under the action of alkali, salt and other environmental media in the processing environment, the chemical bond breaks, causing the change of high molecular structure, resulting in the decrease of mechanical properties, which limits the use of PCR materials to some extent, and the content of PCR materials added for reuse is limited, especially PCR PC / ABS (polycarbonate / acrylonitrile-butadiene-styrene copolymer). Therefore, a method for improving the impact performance of PCR materials, especially PCR PC / ABS materials, is needed to increase the use content of PCR materials. SUMMARY

[0004] The purpose of the present application is to overcome the above technical deficiencies and provide a high-impact PCR PC / ABS material and a preparation method thereof to solve the technical problem of low use of PCR PC / ABS materials with low mechanical properties in the prior art.

[0005] To achieve the above technical purpose, the technical solution provided by the present application is:

[0006] In a first aspect, the present application provides a high-impact PCR PC / ABS material, wherein the raw materials include PCR-PC: 50-87.5%, PCR-ABS: 10-47.5%, long-chain polymer: 0.5-2%, and MBS: 2-5% by weight.

[0007] In a second aspect, the present application provides a preparation method of a high-impact PCR PC / ABS material, comprising the following steps: taking raw materials PCR-PC, PCR-ABS, long-chain polymer and MBS by weight percentage, mixing them uniformly to obtain a premix; melt-extruding the premix to obtain the PCR PC / ABS material.

[0008] Compared with the prior art, the present application has the following advantages:

[0009] The application can improve the molecular weight of the PCR polymer, significantly enhance the impact strength (up to 40-47 KJ / m 2 ), tensile strength (58-69 MPa) and bending modulus (2230-2385 MPa) of the PCR PC / ABS polymer, make up for the low use content of the PCR PC / ABS material with insufficient performance, and promote the high content ratio application of the PCR PC / ABS material.

[0010] Further, the long-chain branched structure polymer added in the application has a small amount and a low proportion after being compounded with the terpolymer MBS, and can still effectively improve the mechanical properties of the PCR PC / ABS material, so as to further promote the high content ratio application of the PCR-PC and PCR-ABS material.

[0011] Further, the length-diameter ratio of the screw of the double-screw extruder in the application is 48:1, which can improve the service life of the screw under the premise of ensuring that the material is fully plasticized and good results are achieved. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantages of the application clearer, the application is further described in detail below with examples. It should be understood that the specific examples described herein are only used to explain the application and do not limit the application.

[0013] Explanation of Abbreviation Terms

[0014] PCR-PC: post-consumer recycled polycarbonate plastic;

[0015] PCR-ABS: post-consumer recycled acrylonitrile-butadiene-styrene copolymer;

[0016] MBS: methyl methacrylate, butadiene and styrene terpolymer, which has a typical core-shell structure.

[0017] The application provides a high-impact PCR PC / ABS material and a preparation method thereof. In order to solve the problem of low impact of the PCR PC / ABS, a long-chain branched structure polymer (polyacrylate cyclohexyl ester) is introduced into the material and compounded with a terpolymer MBS (methyl methacrylate, butadiene and styrene terpolymer) toughening agent to form a "bridging" effect with the PCR PC / ABS polymer, so as to improve the molecular weight of the PCR polymer, significantly enhance the impact strength and melt strength of the PCR PC / ABS polymer, make up for the low use content of the PCR PC / ABS material with insufficient performance, and promote the high content ratio application of the PCR PC / ABS material.

[0018] The high-impact PCR PC / ABS material comprises, by weight percentage, 50-87.5% of PCR-PC, 10-47.5% of PCR-ABS, 0.5-2% of long-chain branched polymer, and 2-5% of MBS.

[0019] Preferably, the raw materials comprise, by weight percentage, 60-76% of PCR-PC, 20-36% of PCR-ABS, 1-1.5% of long-chain branched polymer, and 3-5% of MBS.

[0020] More preferably, the raw materials comprise, by weight percentage, 70% of PCR-PC, 25% of PCR-ABS, 1% of long-chain branched polymer, and 4% of MBS.

[0021] Preferably, the long-chain branched polymer is polycyclohexyl acrylate; more preferably, polycyclohexyl acrylate with a weight average relative molecular weight of 7300, an epoxy equivalent weight of 320, and a glass transition temperature of 60°C is used.

[0022] The application also provides a preparation method of the high-impact PCR PC / ABS material.

[0023] S1. The PCR-PC raw material and the long-chain branched polymer are dried to below 1% of water content, because the PCR-PC raw material and the long-chain branched polymer have high water absorption, they need to be dried in advance, which is beneficial to subsequent material mixing and melting;

[0024] S2. The raw materials acrylonitrile-butadiene-styrene grafted copolymer (PCR-ABS), polycarbonate (PCR-PC), long-chain branched polymer, and MBS are mixed uniformly according to the weight percentage to obtain a premix;

[0025] S3. The premix is subjected to melt extrusion to obtain the PCR PC / ABS material.

[0026] Preferably, in step S2, the raw materials are put into a high-speed mixer and mixed uniformly for 1-3 min.

[0027] Preferably, in step S3, the melt extrusion is performed by using a double-screw extruder.

[0028] Further preferably, the premix is fed into the main feeding port of the twin-screw extruder for melt extrusion, and the melt extrusion is carried out under the following conditions: Zone 1 temperature 180-200 DEG C, Zone 2 temperature 190-230 DEG C, Zone 3 temperature 190-230 DEG C, Zone 4 temperature 190-240 DEG C, Zone 5 temperature 190-250 DEG C, Zone 6 temperature 190-250 DEG C, Zone 7 temperature 190-250 DEG C, Zone 8 temperature 190-250 DEG C, Zone 9 temperature 190-250 DEG C, Zone 10 temperature 190-250 DEG C, Zone 11 temperature 190-240 DEG C, main machine rotation speed 250-600 rpm, and granulation by cooling water of 30-50 DEG C to obtain plastic particles.

[0029] Further preferably, the length-diameter ratio of the screw of the twin-screw extruder is 48:1. If the length-diameter ratio is too low, the material cannot be plasticized well, and the physical properties cannot reach the expected effect; if the length-diameter ratio is too large, the power consumption of the screw will increase accordingly, and the processing and assembly of the screw and the barrel will be difficult, the possibility of screw bending will increase, which will cause scraping and grinding of the screw and the inner wall of the barrel, and reduce the service life.

[0030] The main mechanism of the application is that methyl methacrylate, butadiene and styrene ternary copolymer (MBS) are compounded with long-chain branched polymer to form a "bridging" effect, which can increase the molecular weight of the PCR polymer and enhance the impact strength and melt strength of the PCR polymer.

[0031] The high-impact PCR PC / ABS material and the preparation method thereof will be described in detail below through specific examples and comparative examples.

[0032] Example 1

[0033] The preparation method of the high-impact PCR PC / ABS material described in the application is as follows:

[0034] First, dry the raw materials, then take 70% of PCR-PC, 24.5% of PCR-ABS, 4% of toughening agent MBS and 1.5% of long-chain branched polymer (poly cyclohexyl acrylate) in a high-speed mixer and mix uniformly for 2 min according to the weight percentage to obtain a premix; feed the premix into a twin-screw extruder to obtain the PCR PC / ABS material.

[0035] The melt extrusion is carried out under the following conditions: Zone 1 temperature 180 DEG C, Zone 2 temperature 195 DEG C, Zone 3 temperature 210 DEG C, Zone 4 temperature 215 DEG C, Zone 5 temperature 220 DEG C, Zone 6 temperature 230 DEG C, Zone 7 temperature 240 DEG C, Zone 8 temperature 245 DEG C, Zone 9 temperature 250 DEG C, Zone 10 temperature 250 DEG C, Zone 11 temperature 240 DEG C, and main machine rotation speed 450 rpm.

[0036] Example 2

[0037] The difference from Example 1 is only that the raw material ratio is adjusted, and other steps and conditions are the same as those of Example 1; the specific raw material ratio is as follows: 70% of PCR-PC, 25% of PCR-ABS, 4% of toughening agent MBS, and 1% of long-chain branched structure polymer by weight percentage.

[0038] Example 3

[0039] The difference from Example 1 is only that the raw material ratio is adjusted, and other steps and conditions are the same as those of Example 1; the specific raw material ratio is as follows: 70% of PCR-PC, 25.5% of PCR-ABS, 4% of toughening agent MBS, and 0.5% of long-chain branched structure polymer by weight percentage.

[0040] Comparative Example 1

[0041] The difference from Example 1 is only that the raw material ratio is adjusted, and other steps and conditions are the same as those of Example 1; the specific raw material ratio is as follows: 71.5% of PCR-PC, 24.5% of PCR-ABS, and 4% of toughening agent MBS by weight percentage.

[0042] Comparative Example 2

[0043] The difference from Example 1 is only that the raw material ratio is adjusted, and other steps and conditions are the same as those of Example 1; the specific raw material ratio is as follows: 71% of PCR-PC, 25% of PCR-ABS, and 4% of toughening agent MBS by weight percentage.

[0044] Comparative Example 3

[0045] The difference from Example 1 is only that the raw material ratio is adjusted, and other steps and conditions are the same as those of Example 1; the specific raw material ratio is as follows: 70.5% of PCR-PC, 25.5% of PCR-ABS, and 4% of toughening agent MBS by weight percentage.

[0046] The PCR PC / ABS materials obtained in the above Examples 1-3 and Comparative Examples 1-3 are subjected to performance testing, and the results are shown in Table 1.

[0047] Table 1 Performance of PCR PC / ABS materials obtained in Examples 1-3 and Comparative Examples 1-3

[0048]

[0049] From the results of Table 1, it can be seen that, relative to Comparative Examples 1-3, the addition of long-chain branched structure polymer and 4% MBS in Examples 1-3 can improve the physical properties of the PCR PC / ABS, including notched impact strength, tensile strength and bending modulus, etc., wherein the addition of 1% long-chain branched structure polymer and 4% MBS in Example 2 has the most significant effect, and is more cost-effective, so the most preferred raw material ratio of the present application is 70% PCR-PC, 25% PCR-ABS, 4% toughening agent MBS and 1% long-chain branched structure polymer.

[0050] Unlike the prior art, the present application provides a high-impact PCR PC / ABS material and a preparation method thereof, which can significantly improve the notched impact strength and tensile strength of the PCR type PC / ABS by compounding long-chain branched structure polymer and MBS, making up for the low use content of the PCR material due to its insufficient performance, and promoting the high content ratio application of the PCR material.

[0051] The specific embodiments of the application described above do not constitute a limitation on the scope of protection of the present application. Any various other corresponding changes and modifications made according to the technical concept of the present application shall be included in the scope of protection of the claims of the present application.

Claims

1. A high-impact PCR PC / ABS material, characterized in that, By weight percentage, the raw materials include PCR-PC: 60-76%, PCR-ABS: 20-36%, long-branched polymers: 1-1.5%, and MBS: 3-5%. The long-branched polymer is cyclohexyl polyacrylate; The PCR-PC is a post-consumer recycled polycarbonate plastic; the PCR-ABS is a post-consumer recycled acrylonitrile-butadiene-styrene copolymer; and the MBS is a terpolymer of methyl methacrylate, butadiene, and styrene. The preparation method of the high-impact PCR PC / ABS material includes the following steps: According to the weight percentage, take the raw materials PCR-PC, PCR-ABS, long-branched polymer and MBS and mix them evenly to obtain the premix; The premixed material is melt-extruded, cooled and granulated to obtain the PCR PC / ABS material.

2. The high-impact PCR PC / ABS material according to claim 1, characterized in that, By weight percentage, the raw materials include PCR-PC: 70%, PCR-ABS: 25%, long-branched polymer: 1%, and MBS: 4%.

3. The high-impact PCR PC / ABS material according to claim 1, characterized in that, To achieve uniform mixing, the raw materials are put into a high-speed mixer and mixed evenly for 1 to 3 minutes.

4. The high-impact PCR PC / ABS material according to claim 1, characterized in that, Melt extrusion is performed using a twin-screw extruder.

5. The high-impact PCR PC / ABS material according to claim 4, characterized in that, The twin-screw extruder includes eleven temperature zones; the melt extrusion conditions are as follows: Zone 1 temperature 180–200℃, Zone 2 temperature 190–230℃, Zone 3 temperature 190–230℃, Zone 4 temperature 190–240℃, Zone 5 temperature 190–250℃, Zone 6 temperature 190–250℃, Zone 7 temperature 190–250℃, Zone 8 temperature 190–250℃, Zone 9 temperature 190–250℃, Zone 10 temperature 190–250℃, Zone 11 temperature 190–240℃, and the main extruder speed is 250–600 rpm.

6. The high-impact PCR PC / ABS material according to claim 4, characterized in that, The twin-screw extruder has a screw length-to-diameter ratio of 48:1.

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