CN104119659A - High-fluidity PC (polycarbonate) composition and preparation method thereof - Google Patents
High-fluidity PC (polycarbonate) composition and preparation method thereof Download PDFInfo
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- CN104119659A CN104119659A CN201410249233.5A CN201410249233A CN104119659A CN 104119659 A CN104119659 A CN 104119659A CN 201410249233 A CN201410249233 A CN 201410249233A CN 104119659 A CN104119659 A CN 104119659A
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Abstract
The invention provides a high-fluidity PC (polycarbonate) composition comprising the following components in percentage by weight: 68-88% of PC, 10-25% of styrene-acrylonitrile-cyclopentene copolymer, 1-5% of compatilizer, 0.3-1.0% of antioxidant and 0.5-1.0% of lubricating agent. By adopting the high-fluidity PC composition provided by the invention, the problems that a method for improving the PC fluidity by adopting existing general PS (poly styrene) or SAN easily causes greatly-reduced heat-resistant performance and mechanical performance of a product. The introduced compatilizer SMA can be used for effectively improving the interfacial compatibility of a material and improving the impact toughness of the PC composition. A high-efficiency compounded antioxidant system can be used for inhibiting high-temperature processing yellowing.
Description
Technical field
The present invention relates to polymeric compositions, specifically refer to a kind of high mobile PC composition.
Background technology
PC is a kind of engineering plastics of excellent property, has good mechanical property, dimensional stability, thermotolerance and winter hardiness, and its shock strength is positioned at prostatitis in engineering plastics; Use temperature haves a wide reach, can be between-40～120 ℃ life-time service; Light transmission is good, to the transmitance of visible ray, can reach more than 90%.Although PC high comprehensive performance, still there are some defects in it in processed and applied process, such as: (1) melt viscosity is large, and poor fluidity is especially restricted when manufacturing large thin-wall goods, is difficult to moulding; (2) goods residualinternal stress is large, easily produces stress cracking, and breach is responsive, has limited the application of PC.
Improving PC mobility is one of effective ways that improve PC anti-stress cracking performance, appropriate interpolation polystyrene (PS), the contour liquid resin of styrene-acrylonitrile copolymer (SAN) can obviously improve the machine-shaping property of PC, but the thermotolerance of PC, mechanical property and transparency all have to a certain degree decline, restriction PC is in the popularization in middle-and high-end applications field, for this reason flowability problem of existing PC composition in the urgent need to address.
Summary of the invention
Technical problem to be solved by this invention is that a kind of PC composition of high workability is provided for the present situation of prior art, improves the mobility of PC, makes it have good machine-shaping property.
The present invention also correspondingly provides a kind of preparation method of high workability PC composition.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of PC composition of high workability, is characterized in that comprising the component of following weight per-cent:
PC 68～88%
Styrene-acrylonitrile-cyclopentenes copolymer 10 ~ 25%
Compatilizer 1 ~ 5%
Oxidation inhibitor 0.3 ~ 1.0%
Lubricant 0.5 ~ 1.0%
Described PC is bisphenol A-type PC resin, and melt flow rate (MFR) MI is 6-10g/10min;
Described styrene-acrylonitrile-cyclopentenes multipolymer adopts substance law to produce, weight-average molecular weight 20000-30000, and cyclopentenes weight percent content is 10 ~ 20%, melt flow rate (MFR) MI is 20-40g/10min;
Described compatilizer is atactic styrene-maleic anhydride copolymer (SMA), and wherein MA weight percentage is 10-20%;
Described oxidation inhibitor is B215;
Described lubricant is pentaerythritol tetrastearate PETS.
Correspondingly, also provide a kind of preparation method of high workability PC composition, it is characterized in that comprising the steps:
(1) PC, styrene-acrylonitrile-cyclopentenes multipolymer, compatilizer drying and processing in advance, controls moisture content below 0.02%;
(2) by formula, take PC, styrene-acrylonitrile-cyclopentenes multipolymer, compatilizer, oxidation inhibitor and lubricant;
(3) above-mentioned raw materials and auxiliary agent are put into the discharging in 5-10 minute of high mixer 1000rpm high-speed mixing;
(4) raw material of mixing is put into parallel dual-screw extruding machine extruding pelletization.The length-to-diameter ratio of twin screw extruder used is 32-36, and the rotating speed of screw machine is 150-400rpm, between each section of extruder temperature controlled and is 180-260 ℃, and residence time 1-2 minute;
(5), through tie rod, cooling, pelletizing, finally obtains finished product.
Better, in described twin screw extruder, feeding section temperature is 180-200 ℃, and melt zone temperature is 230-250 ℃, and homogenizing zone temperature is 240-260 ℃, and head temperature is 255-260 ℃.
Compared with prior art, height provided by the present invention flows, and PC composition has solved existing general PS substantially or SAN raising PC mobility easily causes the problems such as product resistance toheat, mechanical property decline to a great extent.The introducing of compatilizer SMA can effectively improve material interface consistency, improves the impelling strength of PC composition.Highly efficiency compositional antioxidant system can suppress high temperature process xanthochromia.
The good product mobility that the present invention obtains, heat-drawn wire is higher, good mechanical properties, cost is moderate, and product can be widely used in the fields such as electronics, electrical equipment, communication, instrument, illumination and automobile component.
Embodiment
Below in conjunction with embodiment and comparative example, the present invention is described in further detail.
PC-1 selects 2805 of Bayer A.G, and MI is 10g/10min.
PC-2 selects 3103 of Bayer A.G, and MI is 6g/10min.
Styrene-acrylonitrile-cyclopentenes multipolymer that SAN-1 selects Ningbo Oceanking Chemical Development Co., Ltd. to produce, weight-average molecular weight is about 20000g/mol, and cyclopentenes content is 20%, MI=40g/10min.
Styrene-acrylonitrile-cyclopentenes multipolymer that SAN-2 selects Ningbo Oceanking Chemical Development Co., Ltd. to produce, weight-average molecular weight is about 30000g/mol, and cyclopentenes content is 10%, MI=20g/10min.
SAN-3 is selected from the 80HF(styrene-acrylonitrile of Xinghua, LG river in Zhejiang Province work), MI=25g/10min.
SMA-1 self-control, maleic anhydride content 10%.
SMA-2 self-control, maleic anhydride content 20%.
SMA-3 self-control, maleic anhydride content 5%.
Lubricant is selected the PETS of U.S. Long Sha company limited.
Oxidation inhibitor is selected the B215 that adds Li Anlong novel material limited-liability company.
The formula of embodiment 1-8 and comparative example 1-4 is in Table 1, wherein comparative example respectively with embodiment 1,3,5,7 contrast.
Table 1 formula
A kind of preparation method of high mobile PC resin follows these steps to carry out:
1,120 ℃ of dry 6h of PC resin, 90 ℃ of dry 4h of styrene-acrylonitrile-cyclopentenes multipolymer and SMA resin;
2, take by weight ratio PC, styrene-acrylonitrile-cyclopentenes multipolymer, compatilizer, oxidation inhibitor and lubricant;
3, above-mentioned raw materials and auxiliary agent are put into the discharging in 10 minutes of high mixer 1000rpm high-speed mixing;
4, the raw material of mixing is put into parallel dual-screw extruding machine extruding pelletization.The length-to-diameter ratio of twin screw extruder used is 36, and the rotating speed of screw machine is 150-400rpm, between each section of extruder temperature controlled and be 180-260 ℃, residence time 1-2 minute, wherein feeding section is 180-200 ℃, melt zone is 230-250 ℃, homogenizing zone is 240-260 ℃, and head is 255-260 ℃.
5,, through tie rod, cooling, pelletizing, finally obtains finished product.
Height prepared by each embodiment and the comparative example PC composition that flows is injection molded into standard batten by standard size and carries out various performance tests, and the physicals of standard batten is all by ASTM standard testing, and testing method is as shown in table 2, and test result is as shown in table 3.
Table 2 performance test methods
Table 3 the performance test results
As can be seen from Table 3: along with the increase of styrene-acrylonitrile-cyclopentenes multipolymer content, the mobility melting index of material significantly improves, by adding suitable SMA random copolymers, the heat-drawn wire of target product only has small size decline, and every mechanical performance index range of decrease is less.Styrene-acrylonitrile-cyclopentenes multipolymer self resistance toheat is good, and heat-drawn wire is apparently higher than general SAN resin, less with PC heat-drawn wire difference.
Comparative example 1 is known with comparative example 1, adopts the over-all properties of general SAN sample gained PC composition obviously to decline, and shock strength, heat-drawn wire all have decline largely.
Comparative example 3 is known with comparative example 2, though significantly improve the heat-drawn wire that PC content can improve product to a certain extent, poor because of composition system consistency, the comprehensive mechanical property range of decrease is comparatively remarkable.
Comparative example 5 is known with comparative example 3, at formula, forms under the prerequisite not becoming, and selects the SMA resin of low MA content directly to cause composition system consistency to worsen, the shock strength of product sharply declines, tensile strength, flexural strength all has decline in various degree, and over-all properties is poor.
Comparative example 7 is known with comparative example 4, significantly adjusts the proportioning of SAN and SMA resin by the consistency of remarkably influenced PC composition system, and comparative example 4 products obtained therefrom over-all propertieies are poor.
Relative each comparative example, embodiments of the invention have advantages of and significantly improve PC Resin Flow, and the over-all properties conservation rates such as the shock strength of product, heat-drawn wire, physical strength are high, and production cost is relatively low.
Claims (3)
1. a PC composition for high workability, is characterized in that comprising the component of following weight per-cent:
PC 68～88%
Styrene-acrylonitrile-cyclopentenes copolymer 10 ~ 25%
Compatilizer 1 ~ 5%
Oxidation inhibitor 0.3 ~ 1.0%
Lubricant 0.5 ~ 1.0%
Described PC is bisphenol A-type PC resin, and melt flow rate (MFR) MI is 6-10g/10min;
Described styrene-acrylonitrile-cyclopentenes multipolymer adopts substance law to produce, weight-average molecular weight 20000-30000, and cyclopentenes weight percent content is 10 ~ 20%, melt flow rate (MFR) MI is 20-40g/10min;
Described compatilizer is atactic styrene-maleic anhydride copolymer (SMA), and wherein MA weight percentage is 10-20%;
Described oxidation inhibitor is B215;
Described lubricant is pentaerythritol tetrastearate.
2. the preparation method of high workability PC composition, is characterized in that comprising the steps:
(1) PC, styrene-acrylonitrile-cyclopentenes multipolymer, compatilizer drying and processing in advance, controls moisture content below 0.02%;
(2) by formula, take PC, styrene-acrylonitrile-cyclopentenes multipolymer, compatilizer, oxidation inhibitor and lubricant;
(3) above-mentioned raw materials and auxiliary agent are put into the discharging in 5-10 minute of high mixer 1000rpm high-speed mixing;
(4) raw material of mixing is put into parallel dual-screw extruding machine extruding pelletization, the length-to-diameter ratio of twin screw extruder used is 32-36, and the rotating speed of screw machine is 150-400rpm, between each section of extruder temperature controlled and is 180-260 ℃, and residence time 1-2 minute;
(5), through tie rod, cooling, pelletizing, finally obtains finished product.
3. the preparation method of high workability PC composition according to claim 2, it is characterized in that: in described twin screw extruder, feeding section temperature is 180-200 ℃, melt zone temperature is 230-250 ℃, and homogenizing zone temperature is 240-260 ℃, and head temperature is 255-260 ℃.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914178A (en) * | 2010-07-30 | 2010-12-15 | 宁波镇洋化工发展有限公司 | Preparation method of dutrex-unsaturated nitrile-cyclenes heat-resistant copolymer |
| CN102070894A (en) * | 2011-01-19 | 2011-05-25 | 烟台万华聚氨酯股份有限公司 | High-fluidity high-impact-resistance scraping-resistance polycarbonate composition and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914178A (en) * | 2010-07-30 | 2010-12-15 | 宁波镇洋化工发展有限公司 | Preparation method of dutrex-unsaturated nitrile-cyclenes heat-resistant copolymer |
| CN102070894A (en) * | 2011-01-19 | 2011-05-25 | 烟台万华聚氨酯股份有限公司 | High-fluidity high-impact-resistance scraping-resistance polycarbonate composition and preparation method thereof |
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Application publication date: 20141029 |