CN112679931A - PC/ABS and regenerated PCTG composite material for electric meter box and preparation method thereof - Google Patents
PC/ABS and regenerated PCTG composite material for electric meter box and preparation method thereof Download PDFInfo
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Abstract
The invention provides a PC/ABS and regenerated PCTG composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: a. 65-75 parts of PC, b, 10-20 parts of ABS, c, 10-20 parts of regenerated PCTG, d, 1-5 parts of toughening agent, e, 0.5-2 parts of compatilizer and f, 0.5-2 parts of other auxiliary agent, wherein the sum of the parts by weight of the six components of a, b, c, d, e and f is 100 parts; the regenerated PCTG is a PCTG product and a recycled crushed material obtained in the production of the product. The PC/ABS and regenerated PCTG composite material prepared by the invention has high impact, high strength, high fluidity and high heat resistance, and meets the performance requirements of electronic and electric products; the invention also provides a recycling mode of the regenerated PCTG, the regenerated PCTG is utilized to improve PC/ABS, and the performance is improved while the PCTG recycling benefit is maximized.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a PC/ABS and regenerated PCTG composite material for an electric meter box and a preparation method thereof.
Background
PC is an engineering plastic with excellent comprehensive performance, benzene rings on a molecular main chain enable the PC to have good mechanical property and heat resistance, and ether bonds enable molecular chains of the PC to have certain flexibility, so that the PC is a rigid and tough engineering plastic. But the processing fluidity is poor, the chemical resistance and the weather resistance are poor, the notch sensitivity is caused, the wide use of the ABS is influenced, the fluidity is improved by adding the ABS to ensure the molding processing of a finished piece, and the heat resistance, the impact and the strength of the ABS are reduced.
In recent years, PC/ABS alloy products are more and more widely used, but it is difficult to achieve an alloy product with excellent high impact, high strength and high heat resistance, mainly because ABS does not contribute to the heat resistance of the alloy. CN106221151A discloses an ABS/PBT/PCTG composite material which has better low-temperature toughness and solvent resistance compared with ABS/PBT/PC alloy, but the heat distortion temperature of the alloy is not high. CN 107987504A discloses a PC/PCTG material with high temperature resistance and easy forming and a preparation method thereof, which mainly improves the fluidity and the forming processing performance of PC through PCTG, although the PC/PCTG material shows slightly higher heat resistance than PC in the embodiment that specific components are added into PCTG, the PC/PCTG material does not have regularity, the proportion of PCTG is slightly adjusted, the high temperature resistance of the PC/PCTG composite material is reduced to the level lower than that of PC, and ABS is not added into the PC/PCTG material.
The plastic electricity meter box made of PC/ABS is a mainstream product of the plastic electricity meter box in the current market, and the fluidity of PC is improved mainly by adding ABS, so that the plastic electricity meter box can basically meet the requirements of the common plastic electricity meter box although the mechanical property and the heat resistance are reduced. Along with the improvement of performance index requirements and the requirement of meeting some severer working condition environments, the performance of the electric meter box is necessary to be further improved, especially, the electric meter box has a plurality of current electronic and electric appliance products, the electricity utilization frequency is increased, the electric meter box runs in a high-load state for a long time, and meanwhile, the environment temperature is continuously increased in recent years for some special environments such as outdoors and summer, so the requirement on the heat deformation temperature of the electric meter box is further improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a PC/ABS and regenerated PCTG composite material which has the advantages of three materials and meets the requirements of high impact, high strength, high fluidity and high heat resistance.
The invention also aims to provide a preparation method of the PC/ABS and regenerated PCTG composite material.
The above purpose of the invention is realized by the following technical scheme:
a PC/ABS and regenerated PCTG composite material comprises the following components in parts by weight:
a. 65 to 75 parts of PC, based on the total weight of the composition,
b. 10 to 20 parts of ABS,
c. 10 to 20 parts of a regenerated PCTG,
d. 1-5 parts of a toughening agent,
e. 0.5 to 2 parts of a compatibilizer,
f. 0.5-2 parts of other auxiliary agents;
wherein, the sum of the parts by weight of the six components a, b, c, d, e and f is 100 parts;
the regenerated PCTG is a recovered broken material of a PCTG product or a recovered broken material obtained in the production of the PCTG product, the heat distortion temperature of the regenerated PCTG is more than or equal to 105 ℃, and the impact strength of the regenerated PCTG is more than or equal to 60KJ/m2。
The inventor finds that the composite material has higher impact, higher strength, higher fluidity and higher heat resistance by adding the third component to regenerate PCTG to replace part of ABS in PC/ABS alloy, and meets the performance requirements of electronic and electric products, especially for products needing heat resistance.
The regenerated PCTG mainly comes from production waste materials such as defective products, leftover materials and the like generated in the processing process of PCTG products such as sports kettles, space cups, milk bottles and the like, and used products of the PCTG products. The PCTG product has higher requirements on heat distortion temperature and the like, and the heat distortion temperature of the regenerated PCTG product can be more easily met. Although the impact performance of the regenerated PCTG is reduced relative to that of the non-regenerated PCTG, the regenerated PCTG has better fluidity, the impact performance of the PCTG is better than that of ABS in a system, and the aim of obviously improving the impact performance of the composite material can be achieved by adjusting the addition amount of the PCTG.
On the other hand, the regenerated PCTG has high recovery cost, so that the maximum benefit cannot be exerted and environmental pollution is caused.
A recycling method of regenerated PCTG is characterized in that the regenerated PCTG equivalently replaces 30-60% of the total ABS amount in PC/ABS alloy for an electricity meter box. More preferably, the alloy for the electric meter box comprises the following components in parts by weight: 65-75 parts of PC, 10-20 parts of ABS, 10-20 parts of regenerated PCTG, 1-5 parts of toughening agent, 0.5-2 parts of compatilizer and a proper amount of other auxiliary agents.
Preferably, the polycarbonate is preferably an aromatic polycarbonate.
The aromatic carbonate may be composed of one aromatic carbonate or a mixture of several aromatic carbonates having different melt indexes. Preferably, if a single aromatic carbonate is used, the aromatic carbonate with the melt index of 6-20 g/10min is preferred; when a plurality of aromatic carbonates are mixed, the melt index of the mixed aromatic polycarbonate mixture is preferably 6 to 20g/10 min.
Preferably, the ABS synthesis method is a bulk method.
The toughening agent can be a toughening agent commonly used for preparing PC/ABS alloy, and preferably, the toughening agent is methyl methacrylate-butadiene-styrene copolymer (MBS) or methyl methacrylate-styrene-organosilicon-butyl acrylate copolymer (MBSi).
The compatilizer can be a compatilizer commonly used for preparing PC/ABS alloy, and preferably, the compatilizer is styrene-acrylonitrile-glycidyl methacrylate copolymer.
The other auxiliary agents are common auxiliary agents in the plastic processing process, and preferably, the other auxiliary agents are antioxidants, lubricants and/or colorants. Specifically, the antioxidant can be one or more selected from tris (2, 4-di-tert-butylphenyl) phosphite (i.e., antioxidant 168), pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] (i.e., antioxidant 1010), or n-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (i.e., antioxidant 1076); the lubricant can be selected from one or more of pentaerythritol stearate (PETS) or N, N-ethylene bis-stearamide (EBS); the colorant can be one or more of inorganic and organic colorants such as titanium dioxide, carbon black, phthalocyanine, ultramarine, azo, and naphthone.
The preparation method of the PC/ABS and regenerated PCTG composite material comprises the following steps:
s1, drying the PC, the ABS and the regenerated PCTG for later use;
s2, weighing PC, ABS, regenerated PCTG, a toughening agent, a compatilizer and other auxiliaries according to the parts by weight, and uniformly mixing to obtain a mixed material;
and S3, putting the mixed material obtained in the step S2 into a double-screw extruder, and performing melt extrusion granulation.
Preferably, in the step S3, the temperature of each section of the screw of the twin-screw extruder is controlled to be 240-250 ℃, and the rotation speed of the screw is controlled to be 300-400 r/min.
Compared with the prior art, the invention has the following beneficial technical effects:
the PC/ABS and regenerated PCTG composite material prepared by the invention has high impact, high strength, high fluidity and high heat resistance, and the tensile strength, the bending strength and the impact strength of the PC/ABS and regenerated PCTG composite material are far higher than the tensile strength of more than 42MPa, the bending strength of more than 65MPa and the impact strength of more than 42KJ/m required by the current electric meter box standard2The heat distortion temperature is more than 100 ℃; therefore, the composite material can better meet the performance requirements of electronic and electric products, particularly for products needing heat resistance, the thermal deformation temperature can reach 105 ℃ under the condition of ensuring the strength and the impact, and meanwhile, the composite material of the invention keeps good flow property (260 ℃/2.16KG under the GB/T3682 standard, the melt index is more than 15), and is convenient to process; the application also provides a recycling mode of the regenerated PCTG, the regenerated PCTG is utilized to improve PC/ABS, and the performance is improved while the PCTG recycling benefit is maximized.
Detailed Description
The present invention will be described in further detail with reference to specific examples and comparative examples, but the present invention is not limited to the examples.
In the examples, the starting materials not specifically mentioned are all conventional commercial products.
PC1, aromatic polycarbonate, melt index 10g/10min (PC 1300-10NP LG chemistry);
PC2, aromatic polycarbonate, melt index 22g/10min (PC 1300-22NP LG chemistry);
PC mixture (mixture of PC1 and PC 21: 1 described above).
ABS 275, bulk, purchased from shanghai highbridge;
the regenerated PCTG1 is a crushed material obtained by crushing and cleaning defective products and leftover materials generated in the processing process of sports kettles, space cups, feeding bottles and the like and used parts, and is sold in the market. The heat distortion temperature is 106 ℃, the test standard is ASTM D648, and the impact strength is 72KJ/m2Test standard GB/T1843.
The regenerated PCTG2 is a crushed material obtained by crushing and cleaning defective goods and leftover materials generated in the processing process of sports kettles, space cups, feeding bottles and the like and used products, and is sold in the market. The heat distortion temperature is 106 ℃, the test standard is ASTM D648, and the impact strength is 60KJ/m2Test standard GB/T1843.
PCTG 3 from Iseman having a Heat distortion temperature of 99 ℃ test Standard ASTM D648 and an impact Strength of 66KJ/m2Test standard GB/T1843.
PCTG 4, commercially available, Heat distortion temperature 105 ℃, test Standard ASTM D648, impact Strength 55KJ/m2Test standard GB/T1843.
Compatibilizer, SAG, available from easy;
toughener, MBS, available from LG chemistry.
The PC/ABS and regenerated PCTG of each example were prepared according to the formulation of Table 1, and the following method:
s1, drying PC for 3-4 h in an electrothermal constant-temperature air blast drying oven at 100-110 ℃, drying ABS for 3-4 h in an electrothermal constant-temperature air blast drying oven at 80-90 ℃, and drying PCTG for 3-4 h in an electrothermal constant-temperature air blast drying oven at 90-1100 ℃;
s2, weighing PC, ABS, regenerated PCTG, a toughening agent, a compatilizer, a colorant, an antioxidant and a lubricant according to the parts by weight, sequentially adding the materials into a high-speed mixer, and stirring for 3-5 min;
s3, putting the mixture in the high-speed mixer into a double-screw extruder, controlling the temperature of each section of screw of the double-screw extruder to be 240-250 ℃, controlling the rotating speed of the screw to be 300-400 r/min, and performing melt extrusion granulation; thus obtaining the PC/ABS and regenerated PCTG composite material of the invention.
TABLE 1
Comparative examples 0 to 3 were prepared according to the same preparation method and the formulation of Table 2
TABLE 2
The PC/ABS and recycled PCTG composites prepared in the examples and comparative examples were tested for tensile, flexural, impact, heat distortion temperature, and flow properties (melt index), and the results are shown in Table 3:
TABLE 3
Examples 1-9 show that the tensile strength, flexural strength and impact strength of the PC/ABS alloy are higher than those of the PC/ABS alloy of comparative example 1 after the regenerated PCTG is added to the PC/ABS alloy, and the strength is improved and the thermal deformation is obviously improved because the regenerated PCTG is added to replace part of ABS.
As can be seen from comparative example 0 and comparative example 1, when ABS is added into PC, the fluidity of the alloy is obviously improved, but the heat resistance (the heat distortion temperature is seriously reduced); comparative example 2 it can be seen that if the ABS is replaced completely with PCTG, this results in a reduction in melt flow rate and affects the flow of the blend, especially for large electricity meter box parts.
It can be seen that the effect of significantly improving the fluidity is not obtained when the amount of ABS is less than 10 parts in example 3 as compared with comparative example 3 and comparative example 2 as compared with comparative example 3. Therefore, the ratio of the amount of PCTG added to ABS must be controlled.
As can be seen from comparison of example 1 with comparative example 4, when the amount of regenerated PCTG is less than 10 parts, the improvement in thermal deformation is not significant and the requirement cannot be satisfied.
Comparative example 5 reflects that when the heat resistant temperature of PCTG is insufficient, the heat distortion cannot satisfy the use requirements.
Comparative example 6 reflects that when the impact resistance of PCTG is less than 60KJ/m2The impact is significantly reduced.
Claims (10)
1. A PC/ABS and regenerated PCTG composite material for an electric meter box comprises the following components in parts by weight:
a. 65 to 75 parts of PC, based on the total weight of the composition,
b. 10 to 20 parts of ABS,
c. 10 to 20 parts of a regenerated PCTG,
d. 1-5 parts of a toughening agent,
e. 0.5 to 2 parts of a compatibilizer,
f. 0.5-2 parts of other auxiliary agents;
wherein, the sum of the parts by weight of the six components a, b, c, d, e and f is 100 parts;
the regenerated PCTG is a recovered broken material of a PCTG product or a recovered broken material obtained in the production of the PCTG product, the heat distortion temperature of the regenerated PCTG is more than or equal to 105 ℃, and the impact strength of the regenerated PCTG is more than or equal to 60KJ/m2。
2. The PC/ABS and recycled PCTG composite material for electric meter boxes according to claim 1, wherein the PC is aromatic polycarbonate or a mixture thereof.
3. The PC/ABS and recycled PCTG composite material for electric meter boxes according to claim 2, wherein the melt index of the aromatic polycarbonate or the mixture thereof is 6-20 g/10 min.
4. The PC/ABS and recycled PCTG composite material for the electric meter box according to claim 1, wherein the PCTG product is a sports kettle, a space cup or a feeding bottle.
5. The PC/ABS and recycled PCTG composite material for the electric meter box according to claim 1, wherein the ABS synthesis method is a bulk method.
6. The PC/ABS and recycled PCTG composite material for electric meter boxes according to claim 1, wherein the toughening agent is a methyl methacrylate-butadiene-styrene copolymer or a methyl methacrylate-styrene-organosilicon-butyl acrylate copolymer.
7. The PC/ABS and recycled PCTG composite material for electric meter boxes according to claim 1, wherein the compatilizer is styrene-acrylonitrile-glycidyl methacrylate copolymer.
8. The PC/ABS and recycled PCTG composite material for electric meter boxes according to claim 1, wherein the other auxiliary agents are antioxidants, lubricants and/or colorants.
9. The method for preparing the PC/ABS and recycled PCTG composite material for the electric meter box according to any one of claims 1 to 8, is characterized by comprising the following steps:
s1, drying the PC, the ABS and the regenerated PCTG for later use;
s2, weighing PC, ABS, regenerated PCTG, a toughening agent, a compatilizer and other auxiliaries according to the parts by weight, and uniformly mixing to obtain a mixed material;
and S3, putting the mixed material obtained in the step S2 into a double-screw extruder, and performing melt extrusion granulation.
10. The preparation method of the PC/ABS and recycled PCTG composite material for the electricity meter box according to claim 9, wherein in the step S3, the temperature of each section of a screw of the double-screw extruder is controlled to be 240-250 ℃, and the rotating speed of the screw is controlled to be 300-400 r/min.
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| CN114702809A (en) * | 2022-03-23 | 2022-07-05 | 武汉金发科技有限公司 | Polycarbonate composition and preparation method and application thereof |
| CN114891333A (en) * | 2022-03-29 | 2022-08-12 | 金发科技股份有限公司 | PC/ABS composite material and preparation method and application thereof |
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