Conductive polypropylene/nylon composite materials and preparation method thereofTechnical field
The present invention relates to high polymer material and its processing and forming field, more particularly to a kind of conductive polypropylene/nylonComposite and preparation method thereof.
Background technology
Nylon is a kind of conventional engineering plastics, and it is a kind of highly polar and can form hydrogen bond in molecule interchain, togetherWhen the crystalline polymer with certain reactivity.Nylon has good mechanical property, wearability.But it is due to nylonPolarity is higher, causes nylon hygroscopic, so as to influence its dimensional stability and electrical property.Polypropylene is a kind of most widely usedGeneral-purpose plastics, compared with other general-purpose plastics, it has cost low, and good mechanical performance, chemically-resistant is well-behaved, to insulateProperty, heat resistance and the high grade of transparency, water absorption rate are low.But it is simultaneously not high there is also heat distortion temperature, low-temperature flexibility is not good, and shaping is receivedShrinkage is larger, and light resistance is poor, not the shortcomings of easy dyeing.These shortcomings limit it and widely applied.To widen its application neckDomain, carries out for polyacrylic modification and extensively and has substantial amounts of application.Binding reactive capacity increasing technique, by nylon and poly- thirdAlkene can combine the advantage of the two by the method for blending and modifying, can obtain impact resistance, high abrasion, high heat-resisting, low water suctionRate, easy coloring, the higher PP/PA compound of shape and size stability.In the Blending Processes of polypropylene and nylon,The bulking agent for being mixed with conductive material is added, the PP/PA composite of conductive energy can be obtained.
The content of the invention
In order to overcome drawbacks described above, the present invention provides a kind of conductive polypropylene/nylon composite materials, composite toolThere are higher electric conductivity and tensile strength.
The technical scheme that is used to solve its technical problem of the present invention is：
A kind of conductive polypropylene/nylon composite materials, it is characterised in that：Include each group of following percentagesPoint：
The polypropylene temperature be 230 DEG C, pressure be that melt flow rate (MFR) under the conditions of 2.16kg is 1~100g/10min。
Preferably, each component of following percentages is included：
The polypropylene temperature be 230 DEG C, pressure be that melt flow rate (MFR) under the conditions of 2.16kg is 20~80g/10min。
Preferably, the nylon is at least two in caprolactam monomer, hexamethylene diamine adipic acid monomer and decanedioic acid decamethylene diaminePlant the binary formed or ternary Nylon.
Preferably, the bulking agent is maleic anhydride inoculated polypropylene, and maleic anhydride grafting ratio is 0.2~5%.
Preferably, the heat stabilizer be phenols, amine, phosphorous acid esters, half Hinered phenols, acryloyl group functional group withAt least one of compound species and calixarenes of monothioester.
Preferably, the processing aid be low molecule esters, metal soap, stearic acid be combined esters, amide-type in extremelyFew one kind.
Preferably, the DBP absorption values of the conductive black are 85~380ml/100g.
Preferably, in addition to whisker, the whisker is at least one of carborundum, potassium titanate, aluminium borate.
Present invention also offers a kind of preparation method of conductive polypropylene/nylon composite materials, comprise the following steps：
(1) weighed respectively after polypropylene, nylon, conductive black, bulking agent, heat stabilizer, processing aid by formula consumption,First conductive black and bulking agent are mixed, both mixtures are obtained, then again by both mixture, polypropylene, Buddhist nunDragon, heat stabilizer, processing aid put into mixer and are well mixed successively, pre-composition are obtained, wherein the condition mixed is：Time3~5 minutes, 400~600 revs/min of speed, 15~50 DEG C of temperature；
(2) pre-composition obtained by being prepared in step (1) is put into double screw extruder, the length of the double screw extruderFootpath ratio is 40~45:1, each section of temperature setting of extruder is 190~240 DEG C, and the pre-composition melts in the double screw extruderMelt the scattered simultaneously extruding pelletization of mixing, PP/PA composite is made.
Preferably, the bulking agent is maleic anhydride inoculated polypropylene, and maleic anhydride inoculated polypropylene includes following by weightMeasure each component of part meter：
100 parts of polypropylene；
2~5 parts of maleic anhydride；
1~2 part of DCP.
The beneficial effects of the invention are as follows：There is carboxyl on the nylon molecules chain that the present invention is used, therefore can be with processingOccur interfacial reaction with bulking agent maleic anhydride inoculated polypropylene, realize In Situ Compatibilization；The effect of heat stabilizer in the present inventionIt is to suppress the degraded that polypropylene is produced in process；The effect of processing aid is to promote good point between each composition of blendDissipate property；Conductive black is added in the PP/PA composite of the present invention therefore with high electrical conductivity energy, had simultaneouslyHigher toughness and impact strength, can be widely applied to some and requires higher field to toughness of material.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described,Obviously, described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based in the present inventionEmbodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, allBelong to the scope of protection of the invention.
Raw material used in the present invention is as follows：
Polypropylene：EP548R, melting means 30g/10min, producer：CNOOC and Shell Petrochemicals Co., Ltd；
Nylon：Nylon 6, producer：Shanghai celluloid factory；
Maleic anhydride inoculated polypropylene：Grafting rate 0.88%, laboratory self-control；
Phosphite ester type thermal stabilizing agent：Refined precious 1010, producer：Albemarle Corporation of the U.S.；
Phenolic thermostabilizers：Refined precious 168, producer：Albemarle Corporation of the U.S.；
Processing aid：Refined precious EBS, producer：Albemarle Corporation of the U.S.；
Conductive black：Highly conductive carbon black F901, superelevation conductive black F900, producer：Tianjin Yi Borui companies.
The preparation method and test process of the present invention is as follows：
Step one：The preparation method of maleic anhydride inoculated polypropylene is as follows：First by dried PP, maleic anhydride andAfter DCP weighs for the ﹕ 1 of 100 ﹕ 2 by ratio of weight and the number of copies, parallel dual-screw extruding machine (model is put into：Berstorff ZE25Type, draw ratio is 40:1) extruded in, extruder is set as successively by feeding section to die temperature：35℃、195℃、200℃、205 DEG C, 210 DEG C, 210 DEG C, 210 DEG C, 210 DEG C, 205 DEG C, rotating speed is 100rpm, and cooling granulation obtains masterbatch, finally by masterbatchIt is placed in stand-by after vacuum drying 12h in 80Z baking ovens；
Step 2：Consumption according to each raw material in table 1 is weighed in polypropylene, nylon, conductive black, step one and is made respectivelyMaleic anhydride inoculated polypropylene, after phosphite ester type thermal stabilizing agent and phenolic thermostabilizers, processing aid, first by conductive charcoalBlack and maleic anhydride inoculated polypropylene is mixed, and obtains both mixtures, then again by both mixtures, polypropylene,Nylon, phosphite ester type thermal stabilizing agent and phenolic thermostabilizers, processing aid put into mixer and are well mixed successively, obtain pre-Mixed thing, wherein the condition mixed is：3~5 minutes time, 600 revs/min of speed, 23 DEG C of temperature；Finally pre-composition is put into doubleIn screw extruder, the draw ratio of the double screw extruder is 40:1, each section of temperature setting of extruder is 190~240 DEG C, instituteThe scattered simultaneously extruding pelletization of pre-composition melting mixing in the double screw extruder is stated, PP/PA composite is made；
Step 3：The test of resistivity and tensile strength is carried out to obtained PP/PA composite；It is molded into markQuasi- batten tests tensile strength；Conducting polypropylene/nylon composite materials that banburying is obtained are pressed on vulcanizing press when 190 DEG CType 5min is made, thickness about 1mm test piece is obtained, according to GB1410-78 standard testing specific insulations.
Consumption (the unit of the embodiment 1~4 of table 1 and comparative example 1：Percentage by weight) and the performance test results
From table 1 it follows that adding the embodiment 1~4 of conductive black compared with the comparative example 1 for not adding conductive blackCompared with adding the resistivity of the PP/PA composite of conductive black reduces, therefore PP/PA composite wood of the present inventionMaterial has good electric conductivity, higher toughness and impact strength.
It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise,Various modifications and improvements can be made, these belong to protection scope of the present invention.Therefore, the protection domain of patent of the present inventionIt should be determined by the appended claims.