CN114181452A - Polypropylene composition and preparation method and application thereof - Google Patents
Polypropylene composition and preparation method and application thereof Download PDFInfo
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- CN114181452A CN114181452A CN202111277115.1A CN202111277115A CN114181452A CN 114181452 A CN114181452 A CN 114181452A CN 202111277115 A CN202111277115 A CN 202111277115A CN 114181452 A CN114181452 A CN 114181452A
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- crosslinking agent
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 91
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 91
- -1 Polypropylene Polymers 0.000 title claims abstract description 88
- 239000000203 mixture Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 69
- 239000011347 resin Substances 0.000 claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 20
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 29
- 239000005977 Ethylene Substances 0.000 claims description 29
- 150000002978 peroxides Chemical group 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- KOMNUTZXSVSERR-UHFFFAOYSA-N 1,3,5-tris(prop-2-enyl)-1,3,5-triazinane-2,4,6-trione Chemical compound C=CCN1C(=O)N(CC=C)C(=O)N(CC=C)C1=O KOMNUTZXSVSERR-UHFFFAOYSA-N 0.000 claims description 6
- DMWVYCCGCQPJEA-UHFFFAOYSA-N 2,5-bis(tert-butylperoxy)-2,5-dimethylhexane Chemical compound CC(C)(C)OOC(C)(C)CCC(C)(C)OOC(C)(C)C DMWVYCCGCQPJEA-UHFFFAOYSA-N 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- DAKWPKUUDNSNPN-UHFFFAOYSA-N Trimethylolpropane triacrylate Chemical compound C=CC(=O)OCC(CC)(COC(=O)C=C)COC(=O)C=C DAKWPKUUDNSNPN-UHFFFAOYSA-N 0.000 claims description 4
- OKKRPWIIYQTPQF-UHFFFAOYSA-N Trimethylolpropane trimethacrylate Chemical compound CC(=C)C(=O)OCC(CC)(COC(=O)C(C)=C)COC(=O)C(C)=C OKKRPWIIYQTPQF-UHFFFAOYSA-N 0.000 claims description 4
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 4
- CCNDOQHYOIISTA-UHFFFAOYSA-N 1,2-bis(2-tert-butylperoxypropan-2-yl)benzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1C(C)(C)OOC(C)(C)C CCNDOQHYOIISTA-UHFFFAOYSA-N 0.000 claims description 3
- BJELTSYBAHKXRW-UHFFFAOYSA-N 2,4,6-triallyloxy-1,3,5-triazine Chemical compound C=CCOC1=NC(OCC=C)=NC(OCC=C)=N1 BJELTSYBAHKXRW-UHFFFAOYSA-N 0.000 claims description 3
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 3
- 239000004971 Cross linker Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 abstract description 29
- 230000015556 catabolic process Effects 0.000 abstract description 7
- 238000006731 degradation reaction Methods 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 abstract description 7
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 17
- 238000001746 injection moulding Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000012360 testing method Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- 238000007334 copolymerization reaction Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000008033 biological extinction Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000006224 matting agent Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 208000003464 asthenopia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- HEAMQYHBJQWOSS-UHFFFAOYSA-N ethene;oct-1-ene Chemical compound C=C.CCCCCCC=C HEAMQYHBJQWOSS-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229920000638 styrene acrylonitrile Polymers 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a polypropylene composition, a preparation method and application thereof. According to the polypropylene composition, the copolymerized polypropylene resin is used as a matrix, the homopolymerized polypropylene part in the copolymerized polypropylene is subjected to chain breakage and the EPR part is subjected to in-situ micro-crosslinking under the synergistic effect of the main crosslinking agent and the auxiliary crosslinking agent, the viscosity ratio of the EPR to the homopolymerized polypropylene part and the phase size of the dispersed phase EPR are improved by utilizing the degradation and crosslinking reaction of the copolymerized polypropylene, the EPR dispersed phase is easy to diffuse reflection, and the glossiness is reduced. The polypropylene composition provided by the invention has the characteristic of low glossiness, and can be widely applied to preparation of automotive upholstery.
Description
Technical Field
The invention relates to the technical field of high polymer materials, and particularly relates to a polypropylene composition and a preparation method and application thereof.
Background
Polypropylene (PP) is used as a general plastic with high cost performance, is simple and convenient to mold and process, and is widely applied to household appliances and automobile products. Automotive interiors often have low gloss requirements because higher gloss easily gives drivers and passengers a dazzling feeling, which is light and causes people visual fatigue, and heavy and causes drivers to be dazzled, thereby causing potential safety hazards.
In the Chinese patent CN108929491A, a delustering agent compounded by maleic anhydride grafted ethylene octene and silicon dioxide is used for preparing a low-gloss polypropylene material, and in the Chinese patent CN102532774A, a styrene-acrylonitrile cross-linked copolymer is used as the delustering agent to achieve the effect of low gloss. These methods mostly reduce the gloss of polypropylene by means of additional addition of matting agents. Therefore, there is a need in the art to develop a method for preparing low gloss polypropylene materials without the need for additional matting agents.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defect and the defect that the existing polypropylene material can achieve low gloss only by adding a delustering agent additionally, and provides a polypropylene composition which has the characteristic of low gloss and does not need to add the delustering agent additionally.
Another object of the present invention is to provide a process for the preparation of a polypropylene composition.
It is a further object of the present invention to provide a use of the polypropylene composition.
The above purpose of the invention is realized by the following technical scheme:
a polypropylene composition comprises the following components in parts by weight:
100 parts of polypropylene resin;
0.03-1 part of main cross-linking agent;
0.1-3 parts of auxiliary crosslinking agent;
the polypropylene resin is copolymerized polypropylene resin;
the content of ethylene chain segments in the copolymerized polypropylene resin is more than 4.7 wt%;
the primary crosslinking agent is a peroxide crosslinking agent; the peroxide crosslinker has a one minute half-life temperature of 170-200 ℃.
The invention adopts the copolymerized polypropylene resin as a matrix, the main components of the copolymerized polypropylene resin are homopolymerized polypropylene and ethylene-propylene copolymer (EPR), wherein the EPR is dispersed in the homopolymerized polypropylene matrix; in the preparation process, the main crosslinking agent is heated to decompose free radicals, and the free radicals cause beta degradation of the copolymerized polypropylene resin and generate new free radicals; however, under the action of the auxiliary crosslinking agent, the free radicals generated after the degradation of the copolymerized polypropylene resin begin to be partially micro-crosslinked; because the ethylene and propylene chain segments in EPR have different reactivity with the main crosslinking agent and the auxiliary crosslinking agent, when beta degradation occurs, the propylene chain segment is taken as the main part in the process, and when micro crosslinking occurs, the ethylene chain segment is taken as the main part, so that the homopolymerized polypropylene part in the copolymerized polypropylene is subjected to chain fracture under the synergistic action of the main crosslinking agent and the auxiliary crosslinking agent, and the EPR part is subjected to micro crosslinking. On the one hand, this makes EPR and homopolymerization polypropylene part viscosity ratio show the increase, and dispersed phase EPR's looks size shows the increase, and the diffuse reflection takes place easily for the EPR dispersed phase, is favorable to reducing glossiness. On the other hand, the molecular weight of the EPR phase after micro-crosslinking is larger, and the plasticizing capacity of the EPR phase is weakened, so that very slight unevenness can be formed on the surface of an injection molding light plate during injection molding of the material, and the unevenness can easily generate diffuse reflection, so that the glossiness of the material is remarkably reduced.
The one-minute half-life temperature of the main crosslinking agent is important, and if the one-minute half-life temperature is too low, the peroxide is decomposed too fast, the free radicals generated by the decomposition of the peroxide are terminated too fast, and the main crosslinking agent is difficult to be matched with the ethylene chain segment and the auxiliary crosslinking agent, so that the effect of reducing the glossiness is difficult to be achieved. If the half-life period temperature of one minute is too high, the peroxide is slowly decomposed, enough effective free radicals are difficult to be rapidly generated in an extruder, the matching effect with an ethylene chain segment and an auxiliary crosslinking agent is not good, and the effect of reducing the glossiness is difficult to be achieved.
Preferably, the composition comprises the following components in parts by weight:
100 parts of polypropylene resin;
0.1-0.5 part of main cross-linking agent;
0.3-1.5 parts of auxiliary crosslinking agent.
The ethylene chain segment is a main structure subjected to micro-crosslinking, and the content of the ethylene chain segment in the polypropylene has an important influence on the glossiness of the polypropylene composition. Preferably, the copolymerized polypropylene resin has an ethylene segment content of 8.9 wt% to 13 wt%.
Preferably, the primary crosslinking agent is one or more of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, di-tert-butyl peroxide, 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane, di (tert-butylperoxyisopropyl) benzene or dicumyl peroxide.
More preferably, the primary crosslinker is 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane and/or di-t-butyl peroxide.
Preferably, the auxiliary crosslinking agent is one or more of triallyl cyanurate, triallyl isocyanurate, trimethylolpropane triacrylate or trimethylolpropane trimethacrylate.
The invention protects the preparation method of the polypropylene composition, which comprises the following steps:
the polypropylene resin, the main cross-linking agent and the auxiliary cross-linking agent are uniformly mixed according to a proportion, and then the polypropylene composition is prepared by melt blending.
The temperature of the melt blending is 170-250 ℃, and the time is 0.5-2 minutes. The mixing is carried out in a high mixing machine. The speed of the high-speed mixer is 50-200rpm, and the time is 1-3 minutes.
The melt blending is carried out in a twin screw extruder.
The invention protects a polypropylene product, which is prepared from the polypropylene composition.
The invention protects the application of the polypropylene composition in preparing low-gloss polypropylene products. Specifically, the low-gloss polypropylene product is an automotive interior trim part.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, an in-situ extinction system is introduced, the copolymerization polypropylene resin is used as a matrix, the homopolymerized polypropylene part in the copolymerization polypropylene is subjected to chain breakage and the EPR part is subjected to in-situ micro-crosslinking under the synergistic action of a main crosslinking agent and an auxiliary crosslinking agent with proper half-life temperature in one minute, the degradation and crosslinking reaction of the copolymerization polypropylene are utilized to improve the viscosity ratio of the EPR and the homopolymerized polypropylene part and the phase size of the EPR dispersed phase, the EPR dispersed phase is easy to diffuse reflection and reduce the glossiness, in addition, as the molecular weight of the EPR phase is increased, the surface of a material obtained after injection molding can form very slight unevenness, and the unevenness generates diffuse reflection, so the glossiness of the material is obviously reduced, and the in-situ extinction effect is generated. The polypropylene composition provided by the invention has the characteristic of low glossiness, and can be widely applied to preparation of automotive upholstery.
Detailed Description
The present invention will be further described with reference to specific embodiments, but the present invention is not limited to the examples in any way. The starting reagents employed in the examples of the present invention are, unless otherwise specified, those that are conventionally purchased.
The raw materials used in the examples and comparative examples:
PP-1: copolymerized PP, having an ethylene content of 4.2% by weight, and having the trade name EP640V, Zhonghai Shell.
PP-2: copolymerized PP, having an ethylene content of 4.7% by weight, and having the trade name EP648U, manufactured by Zhonghai Shell.
And (3) PP-3: copolymerized PP, ethylene content 8.6 wt%, brand M30RH, Zhenhai refining Co.
PP-4: copolymerized PP, having an ethylene content of 8.9% by weight, and having the trade name EP548R, manufactured by Zhonghai Shell.
PP-5: copolymerized PP, ethylene content 9.5 wt%, brand K7227, Guangzhou petrochemical company.
PP-6: the PP copolymer has the ethylene content of 13wt percent and the mark of K9017H and is named as petrochemical company.
PP-7: copolymerized PP, ethylene content 14 wt%, brand K9829H, Yanshan petrochemical company.
PP-8: homopolymeric PP, brand HP500N, Guangzhou petrochemical company.
Primary crosslinking agent-1: 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane, Acksonobel, with a one minute half-life temperature of 179 ℃.
Primary crosslinking agent-2: di-tert-butyl peroxide, alatin, one minute half-life temperature 186 ℃.
Main crosslinking agent-3: 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane, aksunobel, with a one minute half-life temperature of 187 ℃.
Primary crosslinking agent-4: di (t-butylperoxyisopropyl) benzene, aksunobel, with a one minute half-life temperature of 175 ℃.
Primary crosslinking agent-5: dicumyl peroxide, alatin, with a one minute half-life temperature of 171 ℃.
Primary crosslinking agent-6: tert-butyl peroxybenzoate, Allantin, one minute half-life temperature 166 ℃.
Primary crosslinking agent-7: t-butyl hydroperoxide, Acksonobel, one minute half-life temperature 223 ℃.
Auxiliary crosslinking agent-1: triallyl isocyanurate TAIC, alatin corporation.
Auxiliary crosslinking agent-2: triallyl cyanurate TAC, alatin corporation.
Auxiliary crosslinking agent-3: trimethylolpropane triacrylate TMPTA, alatin corporation.
Auxiliary crosslinking agent-4: trimethylolpropane trimethacrylate TMPTMA, alatin corporation.
Examples 1 to 18 and comparative examples 1 to 11
TABLE 1 Components and parts by weight thereof for the examples
TABLE 2 Components in respective proportions and parts by weight thereof
The preparation method of the polypropylene composition comprises the following steps:
adding the polypropylene, the main crosslinking agent and the auxiliary crosslinking agent in the mixture ratio of the polypropylene, the main crosslinking agent and the auxiliary crosslinking agent in the tables 1 and 2 into a high-speed mixer, mixing for 1 minute at 100rpm, and then carrying out melt blending by a double-screw extruder to obtain the polypropylene composition, wherein the time is 0.5-2 minutes, and the polypropylene composition is prepared from a feeding section to a machine head at 170 ℃, 200 ℃, 230 ℃, 250 ℃, 230 ℃, 210 ℃ and 200 ℃.
Performance testing
1. Test method
Testing the specular gloss: the gloss-testing sheet was prepared by injection molding using a cylinder temperature of 230 ℃ (comparative example 7 cannot be injection molded) and a mold temperature of 60 ℃; the measurement was carried out according to GB8807-1988 at an angle of incidence of 60 ℃.
2. Test results
TABLE 3 results of the Performance test of the examples
Table 4 comparative performance test results
From the test results in tables 3 and 4, it can be seen that:
by comparing the examples with the comparative examples, it can be found that the specular gloss of examples 1 to 18 is 12.9 or less, while the gloss of comparative examples 1 to 8 is 40.8 or more. It can be seen that the specular gloss of the examples is significantly lower than that of the comparative examples, and the polypropylene composition provided by the present invention has the characteristic of low gloss.
Taking example 1 as an example, the primary crosslinking agent peroxide 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane is heated in a twin screw to decompose radicals, which cause beta degradation of the co-polypropylene and generate new radicals; however, the crosslinking assistant TAIC generates free radicals after the polypropylene is degraded, and micro-crosslinking begins to occur in part. Because the reactivity of ethylene and propylene chain segments to the main crosslinking agent and the auxiliary crosslinking agent is different, when beta degradation occurs, the process takes the propylene chain segment as the main part, and when micro crosslinking occurs, the ethylene chain segment as the main part. The main components of the polypropylene copolymer are homopolypropylene and ethylene-propylene copolymer (EPR), wherein the EPR is dispersed in the homopolypropylene matrix. Therefore, under the synergistic effect of the main crosslinking agent 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and the auxiliary crosslinking agent TAIC, the homopolymerized polypropylene part in the copolymerized polypropylene is subjected to chain breakage, and the EPR part is subjected to micro-crosslinking. On the one hand, this makes EPR and homopolymerization polypropylene part viscosity ratio show the increase, and dispersed phase EPR's looks size shows the increase, and the diffuse reflection takes place easily for the EPR dispersed phase, is favorable to the glossiness to reduce. On the other hand, the EPR phase subjected to micro-crosslinking has larger molecular weight and weakened plasticizing capacity, so that when the material is subjected to injection molding, very slight unevenness can be formed on the surface of an injection molding light plate, the unevenness is easy to diffuse reflection, and the glossiness of the material is obviously reduced.
It can be seen from the comparison of examples 1, 10, 11, 17, 18 with comparative examples 4, 5, 6, 7 that the contents of the primary and secondary crosslinking agents are very important. The main crosslinking agent and the auxiliary crosslinking agent are contained in a proper range, the glossiness of the prepared polypropylene injection molding light plate is lower than 7, the main crosslinking agent and the auxiliary crosslinking agent are contained in an improper range, and the glossiness of the prepared polypropylene injection molding light plate is not lower than 11. This is because the crosslinking degree of the system is controlled by the contents of the main crosslinking agent and the auxiliary crosslinking agent, and when the contents of the main crosslinking agent and the auxiliary crosslinking agent are high, the crosslinking degree of EPR is high. When the content of the crosslinking agent is low, as shown in example 17, the content of the main crosslinking agent is 0.03, the content of the auxiliary crosslinking agent is 0.1, and the crosslinking degree of EPR is relatively low, so that the effect of the diffused reflection of EPR is relatively weak, and the gloss of the injection-molded light plate prepared from the material is relatively higher, reaches 11.8, and is still within the acceptable range of automotive upholsteries. When the EPR content is lower, as shown in comparative example 4, when the content of the auxiliary crosslinking agent is 0.02 and the content of the auxiliary crosslinking agent is 0.09, the crosslinking of the EPR is very weak, the diffuse reflection effect of the injection molding light plate prepared from the material is poor, and the glossiness reaches 45.6. As shown in example 18, at this time, the content of the main crosslinking agent and the auxiliary crosslinking agent is high, and besides the dispersed phase EPR, the homopolymerized polypropylene part begins to crosslink, so that the viscosity ratio of the dispersed phase and the matrix phase is insufficient, the effect of diffuse reflection of EPR is weakened, and the glossiness of the material reaches 12.9, but still is within the acceptable range of the automotive interior trim part. And the contents of the main crosslinking agent and the auxiliary crosslinking agent are further increased, as shown in comparative example 7, the material is too crosslinked, so that injection molding cannot be performed, and the gloss of the material cannot be tested.
It can be seen from the comparison of examples 1, 12, 13, 14, 15, 16 with comparative examples 8, 9 that the ethylene segment content in the polypropylene is also important. The content of the ethylene chain segment is in a proper range, the glossiness of the prepared polypropylene injection molding light plate is lower than 7, the content of the ethylene chain segment is in an improper range, and the glossiness of the prepared polypropylene injection molding light plate is not lower than 11. This is because the ethylene segment is a main structure in which micro-crosslinking occurs, and thus the gloss of the material can be significantly reduced. The ethylene content of the comparative example 8 is low, the gloss of the injection-molded light plate prepared from the material is 40.8, the comparative example 9 is homopolymerized polypropylene without ethylene chain segment, the gloss of the injection-molded light plate prepared from the material reaches 52.3, and the gloss of the injection-molded light plates prepared from the materials in the comparative examples 8 and 9 is obviously higher than that of the examples. Examples 14, 15 had lower ethylene content and higher gloss than examples 1, 12 and 13. The higher ethylene content of example 16 affects the dispersion in the polypropylene matrix to some extent, and the gloss is higher than that of examples 1, 12 and 13.
By comparing example 1 with comparative examples 1 to 3, it can be seen that the injection molded light plate prepared from the PP material without the crosslinking agent and containing the main crosslinking agent or the auxiliary crosslinking agent alone has high glossiness, and the injection molded light plate with low glossiness can be prepared only by adding the PP material with the main crosslinking agent and the auxiliary crosslinking agent in proper amounts.
By comparing example 1 with comparative example 10, it was found that the one-minute half-life temperature of the main crosslinking agent is also important, and that if the one-minute half-life temperature is too low, the peroxide is decomposed too quickly, and the radicals generated by the decomposition of the peroxide are terminated too quickly, and it is difficult to match the ethylene segment and the co-crosslinking agent, and the effect of reducing the gloss is difficult to be exerted. By comparing example 1 and comparative example 11, if the half-life temperature of one minute is too high, the peroxide decomposition is slow, it is difficult to rapidly generate enough effective radicals in the extruder, the compounding effect with the ethylene chain segment and the auxiliary crosslinking agent is not good, and the effect of reducing the gloss is difficult to be achieved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The polypropylene composition is characterized by comprising the following components in parts by weight:
100 parts of polypropylene resin;
0.03-1 part of main cross-linking agent;
0.1-3 parts of auxiliary crosslinking agent;
the polypropylene resin is copolymerized polypropylene resin;
the content of ethylene chain segments in the copolymerized polypropylene resin is more than 4.7 wt%;
the primary crosslinking agent is a peroxide crosslinking agent; the peroxide crosslinker has a one minute half-life temperature of 170-200 ℃.
2. The polypropylene composition according to claim 1, comprising the following components in parts by weight:
100 parts of polypropylene resin;
0.1-0.5 part of main cross-linking agent;
0.3-1.5 parts of auxiliary crosslinking agent.
3. The polypropylene composition according to claim 1 or 2, wherein the copolymerized polypropylene resin has an ethylene segment content of 8.9 to 13 wt%.
4. The polypropylene composition according to claim 1, wherein the primary crosslinking agent is one or more of 2, 5-dimethyl-2, 5-bis (t-butylperoxy) hexane, di-t-butyl peroxide, 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane, di (t-butylperoxyisopropyl) benzene or dicumyl peroxide.
5. The polypropylene composition of claim 1, wherein the co-crosslinking agent is one or more of triallyl cyanurate, triallyl isocyanurate, trimethylolpropane triacrylate, or trimethylolpropane trimethacrylate.
6. A process for the preparation of a polypropylene composition according to any one of claims 1 to 5, comprising the steps of:
the polypropylene resin, the main cross-linking agent and the auxiliary cross-linking agent are uniformly mixed according to a proportion, and then the polypropylene composition is prepared by melt blending.
7. The method as claimed in claim 6, wherein the melt blending temperature is 170 ℃ and 250 ℃ and the time is 0.5-2 minutes.
8. A polypropylene article, prepared from the polypropylene composition of any one of claims 1 to 5.
9. Use of a polypropylene composition according to any one of claims 1 to 5 for the preparation of a low gloss polypropylene article.
10. The use according to claim 9, wherein the low gloss polypropylene article is an automotive interior trim part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111277115.1A CN114181452B (en) | 2021-10-29 | 2021-10-29 | Polypropylene composition and preparation method and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111277115.1A CN114181452B (en) | 2021-10-29 | 2021-10-29 | Polypropylene composition and preparation method and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114181452A true CN114181452A (en) | 2022-03-15 |
| CN114181452B CN114181452B (en) | 2023-10-31 |
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