CN101805479A - Sag resistant polypropylene and preparation method thereof - Google Patents
Sag resistant polypropylene and preparation method thereof Download PDFInfo
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- CN101805479A CN101805479A CN200910078136A CN200910078136A CN101805479A CN 101805479 A CN101805479 A CN 101805479A CN 200910078136 A CN200910078136 A CN 200910078136A CN 200910078136 A CN200910078136 A CN 200910078136A CN 101805479 A CN101805479 A CN 101805479A
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Abstract
The invention relates to sag resistant polypropylene and a preparation method thereof, wherein the raw materials thereof are as follows in parts by weight: 100 parts of linear polypropylene, 0.5-5 parts of compatilizer, 1-5 parts of nano-clay and 0.5-1 part of antioxidant; and the product is obtained by extruding the raw materials in an extruder at the temperature of 175-205 DEG C. The preparation method comprises the following steps: mixing the linear polypropylene and compatilizer; adding the nano-clay and antioxidant, mixing to obtain a mixed material; adding the mixed material in a dual-screw extruder; extruding and pelletizing at the temperature of 175-205 DEG C; and drying. The invention intercalates the polymer large-molecular chain between sheets of a stack structure of the nano-clay so as to generate a polypropylene/nano-clay composite material with an intercalated structure, and the intercalated stack structure assembly services as a physical linking point in the polypropylene melt, thus improving elasticity of the polypropylene melt, and enhancing the slag-resistance performance of the polypropylene melt.
Description
Technical field
The present invention relates to a kind of polypropylene high molecular material and preparation method thereof, especially a kind of polypropylene with higher sag resistant performance and preparation method thereof belongs to the synthetic field of macromolecular material.
Background technology
Sag resistant is the ability that polymer melt bears himself weight, is a kind of rheological property of material, will measure under molten state usually.General purpose polypropylene is linear polymer, and its viscosity sharply descends later at fusing point, can not show " strain hardening " characteristic, and the product wall thickness inequality appears in the sag resistant poor-performing of melt when causing thermoforming; Edge curl, contraction the time appear in extrusion coated, calendering; The bad phenomenon such as breaking and subside that occurs abscess during extrusion foaming, these problems have limited the application of polypropylene in fields such as thermoforming, extrusion coated, extrusion foaming and blowings.
In order to improve the sag resistant of general purpose polypropylene, expand its Application Areas, must carry out modification to linear polypropylene.Method of modifying commonly used has two kinds: reactor method of modifying and post-reactor method of modifying, wherein, the post-reactor method of modifying is more suitable for suitability for industrialized production and is used widely.Current, the post-reactor method of modifying that improves general purpose polypropylene sag resistant performance mainly comprises: (1) long chain branching technology, i.e. long side chain in grafting on the linear polypropylene molecule main chain, the length of this side chain will reach the level of main chain, will control generation crosslinked and the degraded side reaction simultaneously; (2) blending and modifying promptly is blended into other polymer materialss of sag resistant excellent property in linear polypropylene; (3) cross-linking modified, even produce chemical bond between the linear polypropylene molecular chain, form cross-linked network.
In the above-mentioned method of modifying, the long chain branching Technology Need adopts irradiation apparatus, complex technical process, cause the cost of modification higher, the price of resulting long-chain branching polypropylene almost is more than the linear polyacrylic twice, and be difficult to control the appearance of byproduct of reaction such as gel and oligopolymer in the irradiation process, what in fact obtain is multiple mixture of products, very easily destroys the physical and mechanical property of material etc. when improving the sag resistant performance; And in blending modification method, other polymer materialss that the raising of sag resistant performance has benefited from being added, and addition will very highly just can make polyacrylic sag resistant performance reach satisfied degree, and the interpolation of high-load foreign peoples's polymer materials can bring negative impact to polyacrylic physical and mechanical property equally.
The sag resistant of polymkeric substance and the elasticity of polymer melt are closely related, improve the sag resistant that melt elasticity just helps to improve polymer melt.The molecular structure of melt elasticity and polymkeric substance is closely related, if having physics cross-linking set or chemically crosslinked point in polymer melt, the elasticity of polymer melt will be improved to some extent.But the existence meeting of chemically crosslinked point has a negative impact to the recycling of goods, and the existence of physical crosslinking point then can make goods be recycled, and the physical crosslinking point can be glass region in crystallite district, entanglement point, the multipolymer or crystalline region etc.
Therefore, how, improve the elasticity of polymer melt, and then the polypropylene high molecular material that obtains having higher sag resistant performance is one of problem demanding prompt solution in the synthetic field of present macromolecular material by increasing the physical crosslinking point in the polypropylene.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of polypropylene high molecular material, it is a kind of nanoclay and polyacrylic matrix material, and have polymer macromolecule chain intercalation and enter nanoclay lamella interlayer, this polypropylene has higher sag resistant performance, can satisfy the application requiring in fields such as thermoforming, extrusion coated, extrusion foaming and blowings.
The present invention also aims to provide above-mentioned polyacrylic preparation method.
For achieving the above object, the invention provides a kind of sag resistant polypropylene, its raw material is formed and is comprised: linear polypropylene 100 weight parts, compatilizer 0.5-5 weight part, nanoclay 1-5 weight part, oxidation inhibitor 0.5-1 weight part;
And this sag resistant polypropylene obtains by above-mentioned raw materials is extruded under 175-205 ℃ in forcing machine.
In sag resistant polypropylene provided by the invention, preferably, the linear polypropylene that is adopted is homo-polypropylene or Co-polypropylene, and wherein, homo-polypropylene mostly is isotatic polypropylene, and Co-polypropylene is the multipolymer of propylene and other monomers (for example ethene).
In sag resistant polypropylene provided by the invention, preferably, the compatilizer that is adopted can be a maleic anhydride grafted polymer etc.; More preferably, this maleic anhydride grafted polymer can be maleic anhydride inoculated polypropylene, maleic anhydride graft POE or maleic anhydride graft EPDM etc.
According to specific embodiments of the present invention, in order further to improve polyacrylic sag resistant performance, preferably, can select percentage of grafting for use is the compatilizer of 0.5-2%.
In sag resistant polypropylene provided by the invention, preferably, polynite that the nanoclay that is adopted can be handled for organising through cats product or kaolin etc. can be purchased; The oxidation inhibitor that is adopted can be Hinered phenols antioxidant, amine antioxidants, phosphite ester kind antioxidant or thioesters kind antioxidant etc.
The present invention is by adopting nanoclay as filler, utilize its some stratiform lamellas that have to pile up " storehouse " structure that forms, the method of extruding by employing, polymer macromolecule chain (for example polypropylene molecular chain and compatilizer maleic anhydride inoculated polypropylene molecular chain) is inserted between the lamella of " storehouse " structure, reduce the lamella quantity of " storehouse " structure, keep simultaneously this " storehouse " form again, obtained a kind of polypropylene/nano clay composite material with intercalation configuration, " storehouse " lamella molectron of this intercalation can play the effect of physical crosslinking point in melt polypropylene, can improve the polypropylene melt body elasticity, make the sag resistant performance of melt polypropylene get a promotion.And, the contriver also finds by research, the polymer molecular chain that has for the present invention preparation inserts for the polypropylene of intercalation configuration of nanoclay lamella interlayer, and when the interlamellar spacing of the intercalation configuration in the polypropylene material was between 2.90-3.10nm, its sag resistant performance was better.
The present invention also provides above-mentioned sag resistant polyacrylic preparation method, and it may further comprise the steps:
According to proportioning linear polypropylene and compatilizer are mixed;
Add nanoclay and oxidation inhibitor, mix once more, obtain mixture;
Mixture is added in the twin screw extruder, in 175-205 ℃ of following melt blending, extruding pelletization, drying.
According to specific embodiments of the present invention, preferably,,, can add an amount of whiteruss or white oil with linear polypropylene and compatilizer blended while in order to guarantee the good distribution of nanoclay in polypropylene.
Compare with the polypropylene of blend or cross-linking method preparation with long chain branching, the sag resistant polypropylene of the present invention's preparation has intercalation configuration, has higher sag resistant, when applying it to fields such as thermoforming, extrusion coated, extrusion foaming and blowing, the product wall thickness inequality can not appear, edge curl, contraction, abscess bad phenomenon such as break, subside.And sag resistant provided by the invention is polyacrylic preparation method have the following advantages: (1) adopts the technology of fusion intercalation, and structure control is flexible, and technology is simple, be convenient to operation; (2) preparation cost is cheap; (3) do not destroy the structure of polypropylene molecule main chain in the preparation, do not produce the gel of crosslinking structure.
Description of drawings
Fig. 1 is the polyacrylic sag resistant The performance test results of sag resistant of F401, embodiment 1-4 and Comparative Examples 1 preparation;
Fig. 2 is the polyacrylic sag resistant The performance test results of sag resistant of T36F, embodiment 5-8 and Comparative Examples 2 preparations;
Fig. 3 is the polyacrylic sag resistant The performance test results of sag resistant of F401, embodiment 9-12 and Comparative Examples 3 preparations;
Fig. 4 is the polyacrylic sag resistant The performance test results of sag resistant of T36F, embodiment 13-16 and Comparative Examples 4 preparations;
Fig. 5 is the polyacrylic sag resistant The performance test results of sag resistant of linear polypropylene and embodiment 17-20 preparation;
Fig. 6 is the polyacrylic XRD curve of sag resistant of nanoclay, embodiment 1-4 and Comparative Examples 1 preparation;
Fig. 7 is the polyacrylic XRD curve of sag resistant of nanoclay, embodiment 5-8 and Comparative Examples 2 preparations;
Fig. 8 is the polyacrylic XRD curve of sag resistant of nanoclay, embodiment 9-12 and Comparative Examples 3 preparations;
Fig. 9 is the polyacrylic XRD curve of sag resistant of nanoclay, embodiment 13-16 and Comparative Examples 4 preparations;
Figure 10 is the polyacrylic structural representation of sag resistant that the present invention prepares;
Figure 11 is the structural representation of the molten tester that hangs down of the present invention.
Embodiment
Below introduce realization of the present invention and the beneficial effect that had by specific embodiment, but should not constitute any qualification to practical range of the present invention in view of the above.
Embodiment 1-20 and Comparative Examples 1-4
Main raw material:
Polypropylene 1 (PP1), F401, Panjin ethene limited liability company;
Polypropylene 2 (PP2), T36F, Shandong petrochemical complex limited-liability company;
The organic nano clay, I.44P, U.S. nanocor company;
Oxidation inhibitor, IRGANOX1010, Ciba company;
White oil, chemical pure, English chemical reagent company limited converges in Tianjin;
The sag resistant that embodiment 1-20 and Comparative Examples 1-4 provide is polyacrylic become to be grouped into as shown in table 1.
Preparation process:
Maleic anhydride inoculated polypropylene and linear polypropylene and white oil are added in the high speed mixer, and high-speed stirring is mixed 5min;
Add nanoclay, oxidation inhibitor in high speed mixer, high-speed stirring is mixed 10min, obtains Preblend, discharging;
Melt blending, extruding pelletization are carried out in the Preblend that obtains under 175-205 ℃ in twin screw extruder, drying obtains the sag resistant polypropylene.
Table 1 embodiment 1-20 and the sag resistant of Comparative Examples 1-4 be polyacrylic to become to be grouped into (weight part)
| Composition | PP1/ part | PP2/ |
1/ part of |
2/ part of |
3/ part of compatilizer | Nano clay/part | Oxidation inhibitor/ |
| Embodiment | |||||||
| 1 | ??100 | ??- | ??0.5 | ??- | ??- | ??3 | ??0.5 |
| |
??100 | ??- | ??1 | ??- | ??- | ??3 | ??0.5 |
| |
??100 | ??- | ??3 | ??- | ??- | ??3 | ??0.5 |
| |
??100 | ??- | ??5 | ??- | ??- | ??3 | ??0.5 |
| |
??- | ??100 | ??0.5 | ??- | ??- | ??3 | ??0.5 |
| |
??- | ??100 | ??1 | ??- | ??- | ??3 | ??0.5 |
| Embodiment 7 | ??- | ??100 | ??3 | ??- | ??- | ??3 | ??0.5 |
| |
??- | ??100 | ??5 | ??- | ??- | ??3 | ??0.5 |
| Embodiment 9 | ??100 | ??- | ??- | ??0.5 | ??- | ??3 | ??0.5 |
| |
??100 | ??- | ??- | ??1 | ??- | ??3 | ??0.5 |
| Embodiment 11 | ??100 | ??- | ??- | ??3 | ??- | ??3 | ??0.5 |
| Embodiment 12 | ??100 | ??- | ??- | ??5 | ??- | ??3 | ??0.5 |
| Embodiment 13 | ??- | ??100 | ??- | ??0.5 | ??- | ??3 | ??0.5 |
| Embodiment 14 | ??- | ??100 | ??- | ??1 | ??- | ??3 | ??0.5 |
| Embodiment 15 | ??- | ??100 | ??- | ??3 | ??- | ??3 | ??0.5 |
| Embodiment 16 | ??- | ??100 | ??- | ??5 | ??- | ??3 | ??0.5 |
| Embodiment 17 | ??100 | ??- | ??- | ??- | ??0.5 | ??3 | ??0.5 |
| Embodiment 18 | ??100 | ??- | ??- | ??- | ??1 | ??3 | ??0.5 |
| Embodiment 19 | ??100 | ??- | ??- | ??- | ??3 | ??3 | ??0.5 |
| Embodiment 20 | ??100 | ??- | ??- | ??- | ??5 | ??3 | ??0.5 |
| Comparative Examples 1 | ??100 | ??- | ??10 | ??- | ??- | ??3 | ??0.5 |
| Comparative Examples 2 | ??- | ??100 | ??10 | ??- | ??- | ??3 | ??0.5 |
| Comparative Examples 3 | ??100 | ??- | ??- | ??10 | ??- | ??3 | ??0.5 |
| Comparative Examples 4 | ??- | ??100 | ??- | ??10 | ??- | ??3 | ??0.5 |
Test routine performance test and structural characterization
Sag resistant performance: with the sag resistant polypropylene granules compressing tablet on vulcanizing press that obtains, 200 ℃ of temperature, the thick 3mm of sheet;
The sheet material that presses is made the molten test bars of hanging down that is of a size of 200mm * 10mm * 3mm;
This batten is fixed on the anchor clamps of the molten tester that hangs down, places in the constant temperature oven (190 ℃), measure the distance L of the molten batten lower-most point of hanging down, every 30s record data, the structure of the molten tester that hangs down used in the present invention as schematically shown in Figure 11, its height h is generally 50cm, width w is generally 20cm.Wherein, crooked part is the molten test bars of hanging down, and whole device is positioned at baking oven in the test process.
The contriver discovers that compatibilizer content also has a significant impact polypropylene/nano clay matrix material sag resistant performance, trace it to its cause and mainly contain two aspects: on the one hand, the compatilizer addition is many, and the polar group content of introducing increases, and can improve the consistency between polypropylene and the nano clay; On the other hand, the molecular weight of sag resistant and material is also closely bound up, the low-molecular-weight compatilizer of excessive interpolation can cause the decline of material property, thereby significantly impact the sag resistant performance, this point is obviously embodied aspect higher compatilizer use in melt flow rate (MFR), in an embodiment, compatibilizer content is that 10 parts the polyacrylic sag resistant performance of sag resistant is obviously poor.
Among embodiment 1-8 and the Comparative Examples 1-2, add the polyacrylic sag resistant performance of sag resistant that the compatilizer Polybond 3200 of different content prepares among polypropylene F401 and the T36F respectively as depicted in figs. 1 and 2, wherein, on behalf of polypropylene F401, curve 2-5, the curve among Fig. 11 represent sag resistant polypropylene, the curve 6 of embodiment 1-4 preparation to represent the sag resistant polypropylene of Comparative Examples 1 preparation respectively; On behalf of polypropylene T36F, curve 2-5, the curve 1 among Fig. 2 represent sag resistant polypropylene, the curve 6 of embodiment 5-8 preparation to represent the sag resistant polypropylene of Comparative Examples 2 preparations respectively.As can be seen, with the variation of compatilizer Polybond 3200 content, the polyacrylic molten length of hanging down of sag resistant reduces in the identical time from Fig. 1 and Fig. 2, and the molten time of hanging down increases, and shows that the polyacrylic sag resistant performance of sag resistant increases than virgin pp; And compatibilizer content is not simultaneously, and the degree that the sag resistant performance improves is also different.In embodiment 1-4 and Comparative Examples 1, compatilizer Polybond 3200 content are that the polyacrylic sag resistant performance of sag resistant of 3 parts (embodiment 3) and 5 parts (embodiment 4) is best, and compatibilizer content is that the polyacrylic sag resistant performance of sag resistant of 10 weight parts (Comparative Examples 1) is relatively poor relatively; In embodiment 5-8 and Comparative Examples 2, compatibilizer content is that the polyacrylic sag resistant performance of sag resistant of 0.5 weight part (embodiment 5) is best, and compatibilizer content is that the polyacrylic sag resistant performance of sag resistant of 10 weight parts (Comparative Examples 2) is relatively poor relatively.And the sag resistant performance of polypropylene F401 itself is better than the sag resistant performance of polypropylene T36F, and the polyacrylic sag resistant performance of the sag resistant that utilizes polypropylene F401 to prepare also is better than the sag resistant polypropylene that utilizes polypropylene T36F to prepare.
Among embodiment 9-16 and the Comparative Examples 3-4, the compatilizer Fusabond 353D that adds different content among polypropylene F401 and the T36F respectively, the polyacrylic sag resistant performance of the sag resistant for preparing as shown in Figure 3 and Figure 4, wherein, on behalf of polypropylene F401, curve 2-5, the curve among Fig. 31 represent sag resistant polypropylene, the curve 6 of embodiment 9-12 preparation to represent the sag resistant polypropylene of Comparative Examples 3 preparations respectively; On behalf of polypropylene T36F, curve 2-5, the curve 1 among Fig. 4 represent sag resistant polypropylene, the curve 6 of embodiment 13-16 preparation to represent the sag resistant polypropylene of Comparative Examples 4 preparations respectively.From Fig. 3 and Fig. 4 as can be seen, adding the polyacrylic sag resistant performance of sag resistant that compatilizer Fusabond 353D prepares improves a lot than the sag resistant performance of polypropylene matrix F401 and T36F.In embodiment 9-12 and Comparative Examples 3, compatibilizer content is that the polyacrylic sag resistant performance of sag resistant of 0.5 weight part (embodiment 9) is best, and in embodiment 13-16 and Comparative Examples 4, compatibilizer content is that the polyacrylic sag resistant performance of sag resistant of 1 weight part (embodiment 14) is best, and the compatibilizer content of Comparative Examples 3 and 4 preparations is that the polyacrylic sag resistant performance of sag resistant of 10 weight parts is relative relatively poor.
The polyacrylic sag resistant The performance test results of sag resistant that to adopt percentage of grafting among the embodiment 17-20 be 0.5% maleic anhydride inoculated polypropylene prepares as compatilizer as shown in Figure 5, wherein, curve 1-5 represents the sag resistant polypropylene of the polypropylene that do not add compatilizer and embodiment 17-20 preparation respectively.As seen from Figure 5, the polyacrylic sag resistant performance of sag resistant that provides of embodiment 17-20 is greatly improved than plain polypropylene.
Polypropylene is a non-polar high polymer, and nano clay is the polarity inorganics, and is also incompatible on both thermodynamics.The present invention is by adding the interface compatibility that compatilizer (for example maleic anhydride inoculated polypropylene) can improve polypropylene and nanoclay, in the intercalation process, maleic anhydride and nanoclay surface produce hydrogen bond action, can provide power for polyacrylic macromolecular chain inserts between the nanoclay lamella.
Among embodiment 1-8 and the Comparative Examples 1-2, add the polyacrylic X diffracting spectrum of sag resistant that the compatilizer Polybond 3200 of different content obtains among polypropylene F401 and the T36F respectively as shown in Figure 6 and Figure 7, wherein, 1 representative of the curve among Fig. 6 is that on behalf of sag resistant polypropylene, the curve 6 of embodiment 1-4 preparation, nanoclay, curve 2-5 represent the sag resistant polypropylene of Comparative Examples 1 preparation; What the curve 1 among Fig. 7 was represented is that on behalf of sag resistant polypropylene, the curve 6 of embodiment 5-8 preparation, nanoclay, curve 2-5 represent the sag resistant polypropylene of Comparative Examples 2 preparations.
By Fig. 6 and Fig. 7 as seen, after adding compatilizer Polybond 3200, I.44P, the polyacrylic diffraction angle of sag resistant all reduces to some extent than clay, can get corresponding clay lamella interlamellar spacing by Bragg equation increases, illustrate that the macromole intercalation enters between the clay lamella, its interlamellar spacing is increased, and I.44P the polyacrylic relative diffracted intensity of sag resistant all reduce than pure clay.
In embodiment 1-8 and Comparative Examples 1-2, the content difference of compatilizer Polybond 3200, the polyacrylic intercalation configuration of prepared sag resistant also has certain difference.Compatilizer Polybond 3200 content of Comparative Examples 1 preparation are the polyacrylic interlamellar spacing maximum of sag resistant of 10 weight parts, and the compatibilizer content of embodiment 3 preparations is the polyacrylic interlamellar spacing minimum of sag resistant of 3 weight parts; The compatibilizer content of Comparative Examples 2 preparations is the polyacrylic interlamellar spacing maximum of sag resistant of 10 weight parts, and the compatibilizer content of embodiment 5 preparations is the polyacrylic interlamellar spacing minimum of sag resistant of 0.5 weight part.As seen, the content of different compatilizers, different polypropylene matrixs, the polyacrylic intercalation configuration of the sag resistant for preparing there are differences.
Among embodiment 9-16 and the Comparative Examples 3-4, add the polyacrylic X diffracting spectrum of sag resistant such as Fig. 8 and shown in Figure 9 that the compatilizer Fusabond 353D of different content obtains among polypropylene F401 and the T36F respectively, wherein, on behalf of nanoclay, curve 2-5, the curve among Fig. 81 represent sag resistant polypropylene, the curve 6 of embodiment 9-12 preparation to represent the sag resistant polypropylene of Comparative Examples 3 preparations respectively; On behalf of nanoclay, curve 2-5, the curve 1 among Fig. 9 represent the sag resistant polypropylene of embodiment 13-16 preparation respectively, and curve 6 is represented the sag resistant polypropylene of Comparative Examples 4 preparations.
By Fig. 8 and Fig. 9 as seen, add compatilizer Fusabond 353D after, I.44P the polyacrylic interlamellar spacing of sag resistant all increases than clay, diffraction peak intensity is lower than I.44P.Be that the sag resistant polypropylene of matrix preparation is compared with polypropylene F401 among the embodiment 9-12, embodiment 13-16 is that the relative diffracted intensity of the polyacrylic XRD of sag resistant of matrix preparation is lower with polypropylene T36F.
The consumption difference of compatilizer Fusabond 353D, the polyacrylic intercalation configuration of gained sag resistant also has certain difference.In embodiment 9-12 and Comparative Examples 3, the compatilizer Fusabond353D content of embodiment 12 preparations is the polyacrylic interlamellar spacing maximum of sag resistant of 5 weight parts, and the compatibilizer content of Comparative Examples 3 preparations is the polyacrylic interlamellar spacing minimum of sag resistant of 10 weight parts; In embodiment 13-16 and Comparative Examples 4, the compatibilizer content of embodiment 15 preparations is the polyacrylic interlamellar spacing maximum of sag resistant of 3 weight parts, and the compatibilizer content of embodiment 14 preparations is the polyacrylic interlamellar spacing minimum of sag resistant of 1 weight part.Equally as seen, different compatibilizer content, different polypropylene matrixs, the polyacrylic intercalation configuration of the sag resistant for preparing there are differences.
Nano clay is a laminate structure, in the sag resistant polypropylene of the present invention's preparation, has formed intercalation configuration by the method that adopts melt blending, as shown in figure 10, the polymer macromolecule chain enters clay layer, the interlamellar spacing of lamella is increased, but lamella still keeps ordered structure." storehouse " lamella molectron of this intercalation configuration can play physical crosslinking point in polymer melt, can improve melt elasticity, makes the sag resistant performance of polymer melt be improved, shown in Fig. 1-5.
Shown in Fig. 1-5, the polyacrylic sag resistant performance of sag resistant the best of embodiment 3,5,9 and 14 preparations, the interlamellar spacing of its intercalation configuration is respectively: 2.93nm, 2.90nm, 3.09nm and 3.05nm, this shows, be not that the big more or intercalation of interlamellar spacing, the good more material melt sag resistant effect that obtains of extent of exfoliation are excellent more, and the sag resistant better performances of the sag resistant melt polypropylene of the intercalation configuration in certain interlamellar spacing scope, the interlamellar spacing of its intercalation configuration is preferably between 2.90-3.10nm.
By the sag resistant The performance test results of embodiment 1-20 as can be seen, nanoclay is filled in the linear polypropylene matrix, pass through fusion intercalation, the linear polyacrylic molten length of hanging down changes slowly in time, in the identical time, the molten purer linear polypropylene of length that hangs down of the matrix material after the modification significantly reduces.For persons skilled in the art, the raising of plain polypropylene sag resistant is very difficult, and this is the known fact.And sag resistant polypropylene provided by the present invention has had lifting clearly with respect to plain polypropylene, mainly is the increase of the molten length of hanging down, and amplitude is about 10-20%.This shows, the polyacrylic sag resistant performance of sag resistant of the present invention preparation is significantly increased than the polyacrylic sag resistant performance of common linearity, and the polyacrylic preparation method of sag resistant provided by the invention has that technology is simple, easy to operate, with low cost, do not produce the advantages such as gel of crosslinking structure in the preparation.
Claims (9)
1. sag resistant polypropylene, its raw material is formed and is comprised: linear polypropylene 100 weight parts, compatilizer 0.5-5 weight part, nanoclay 1-5 weight part, oxidation inhibitor 0.5-1 weight part;
And this sag resistant polypropylene obtains by described raw material is extruded under 175-205 ℃ in forcing machine.
2. sag resistant polypropylene as claimed in claim 1, wherein, described linear polypropylene is homo-polypropylene or Co-polypropylene.
3. sag resistant polypropylene as claimed in claim 1, wherein, described compatilizer is a maleic anhydride grafted polymer.
4. sag resistant polypropylene as claimed in claim 3, wherein, described maleic anhydride grafted polymer is maleic anhydride inoculated polypropylene, maleic anhydride graft POE or maleic anhydride graft EPDM.
5. as claim 1 or 3 described sag resistant polypropylene, wherein, the percentage of grafting of described compatilizer is 0.5-2%.
6. sag resistant polypropylene as claimed in claim 1, wherein, polynite or the kaolin of described nanoclay for organising and handle through cats product.
7. sag resistant polypropylene as claimed in claim 1, wherein, described oxidation inhibitor is Hinered phenols antioxidant, amine antioxidants, phosphite ester kind antioxidant or thioesters kind antioxidant.
8. sag resistant polypropylene as claimed in claim 1, wherein, this sag resistant polypropylene has the structure that polypropylene molecular chain is inserted nanoclay lamella interlayer, and interlamellar spacing is 2.90-3.10nm.
9. the polyacrylic preparation method of each described sag resistant of claim 1-8, it may further comprise the steps:
According to proportioning linear polypropylene and compatilizer are mixed;
Add nanoclay and oxidation inhibitor, mix, obtain mixture;
Mixture is added in the twin screw extruder, in 175-205 ℃ of following extruding pelletization, drying.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098790A (en) * | 2014-08-05 | 2014-10-15 | 四川大学 | Method for improving antioxidant efficiency of antioxidants for polymer materials |
| CN108152320A (en) * | 2016-12-05 | 2018-06-12 | 中国石油天然气股份有限公司 | Sample consolidate fixed sum data collecting device, sag resistant performance test device and method |
| CN108410059A (en) * | 2018-01-31 | 2018-08-17 | 广东金发科技有限公司 | A kind of optical cable polypropylene filling rope PP Pipe Compound and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1594412A (en) * | 2004-06-17 | 2005-03-16 | 上海交通大学 | High bath-strength polypropylene and method for preparing same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104098790A (en) * | 2014-08-05 | 2014-10-15 | 四川大学 | Method for improving antioxidant efficiency of antioxidants for polymer materials |
| CN108152320A (en) * | 2016-12-05 | 2018-06-12 | 中国石油天然气股份有限公司 | Sample consolidate fixed sum data collecting device, sag resistant performance test device and method |
| CN108410059A (en) * | 2018-01-31 | 2018-08-17 | 广东金发科技有限公司 | A kind of optical cable polypropylene filling rope PP Pipe Compound and preparation method thereof |
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