CN1305955C - Cisdene-low density polyethylene cross-linked material, preparation and use thereof - Google Patents
Cisdene-low density polyethylene cross-linked material, preparation and use thereof Download PDFInfo
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Abstract
The present invention discloses a polybutadiene rubber and low-density polyethylene crosslinking object, a preparation method and the purposes thereof. The polybutadiene rubber and low-density polyethylene crosslinking object is composed of 50 to 80 parts by weight of polybutadiene rubber, 20 to 50 parts by weight of low-density polyethylene, 0 to 10 parts by weight of inorganic rigid particle and 0.1 to 1 part by weight of peroxide initiating agent. The preparation method comprises the steps that the granulated polybutadiene rubber, the low-density polyethylene and the inorganic rigid particles are orderly put into a low-speed mixer; after the components are premixed at normal temperature, the inorganic peroxide initiating agent is slowly added to the premixed object and is mixed for 6 to 8 minutes at normal temperature, the mixture is granulated by putting into homodromous and parallel double-screw extruders of which the sectional temperature is from 150 to 180 DEG C, and the mixture is hot granulated by a water annular mould surface. The present invention has the purposes of toughening modification and low-temperature impact toughness increase of the homopolymerization polypropylene. The crosslinking object has the advantages of obvious impact toughness increase of the homopolymerization polypropylene, particularly low-temperature impact toughness, small influence for the rigidity and the tensile property of the polypropylene, little addition quantity, simple production technology and low production cost.
Description
Technical field:
The present invention relates to the homo-polypropylene production technical field, particularly a kind of Cisdene-low density polyethylene cross-linked material and preparation method thereof.
Background technology:
Because production technique is simple relatively, production cost is lower, and homo-polypropylene is still occupied quite great proportion at the acrylic resin production industry at present.This important macromolecular material has that comprehensive mechanical performance is better, chemical resistant properties is excellent, nontoxic, advantage such as processing characteristics is good, add the continuous progress of modification technology, its Application Areas progressively has been extended to fields such as wrapping material, medical material, tame electric material, material of construction and automotive material.But it should be noted that the toughness that improves homo-polypropylene is to carry out the matter of utmost importance that modification work will be considered all the time.The method for toughening that the homo-polypropylene toughening modifying is commonly used is to add rubber components such as terpolymer EP rubber (EPDM), ethylene-propylene rubber(EPR) (EPR), ethylene-octene copolymer elastomerics (POE), styrene-butadiene rubber(SBR) (SBS), HSBR (SEBS) etc. in blending modification system, but because of need in modified system, adding more rubber or elastomerics, though the toughness of material has obtained remarkable improvement, but other performances of material have but lost balance, and especially its rigidity and loss of tensile strength are bigger.The POE/ high density polyethylene(HDPE) toughened master batch that patent CN01114932.9 introduces can improve the toughness of homo-polypropylene to greatest extent with minimum addition, and simultaneously unlikely again undue other performances that influence material are rigidity particularly; But because the used POE of this masterbatch of preparation is a kind of metallocene linear polyethylene elastomerics, be substantially devoid of two keys on its macromolecular chain, therefore its second-order transition temperature is higher, though this toughened master batch can significantly improve the normal temperature impelling strength of homo-polypropylene, but but be difficult to significantly improve the low-temperature impact toughness of homo-polypropylene, therefore also just be difficult to expand homo-polypropylene in low temperature environment or the bigger environmental applications of the temperature difference.The cross-linking foamed cis-1,4-polybutadiene rubber composition that CN1045801A and CN1045802A introduce has the flexibility of good elasticity and similar sponge, can be used for producing toy etc., but its correlation technique index has just been emphasized the elasticity of composition.The sulfurized polyolefin plastoelastomer composition that ZL95116987.4 introduces is polypropylene/polyisobutene/EPDM/ high-cis cis-1,4-polybutadiene rubber carries out the dynamic vulcanization preparation in Banbury mixer in the presence of superoxide a thermoplastic elastomer, and purpose also just obtains best machinery and elastic property.
Summary of the invention: toughening modifying, the low-temperature impact toughness that is difficult to significantly improve homo-polypropylene of material
Its rigidity, loss of tensile strength are big and solve the problem of its low-temperature impact toughness when the objective of the invention is to solve the toughness that improves homo-polypropylene, a kind of Cisdene-low density polyethylene cross-linked material and its production and use is provided, this cross-linking agent significantly improves the impelling strength of homo-polypropylene, especially its low-temperature impact toughness, and it is less to rigidity, the tensile property influence of homo-polypropylene, addition is few, and production cost is lower; Its preparation method is easy, and environmental requirement is low, is widely used.
For achieving the above object, the technical solution adopted in the present invention is: a kind of Cisdene-low density polyethylene cross-linked material, and it is made up of following compositions: the peroxide initiator of the new LDPE (film grade) of the cis-1,4-polybutadiene rubber of ratio of quality and the number of copies 50-80, ratio of quality and the number of copies 20-50, the inorganic rigid particle of ratio of quality and the number of copies 0-10, ratio of quality and the number of copies 0.1-1;
The numerical value that the crude rubber Mooney viscosity ML (1+4) of cis-1,4-polybutadiene rubber is 100 ℃ is between 38-45;
The long-branch-chain polyethylene that new LDPE (film grade) is produced for the high pressure vapor method, density are between 0.919～0.923 gram/cubic centimetre, and melting index MI is between 1.8～3.2 grams/10 minutes;
Its degree of crosslinking of Cisdene-low density polyethylene cross-linked material is between 50.2～65.7%;
Inorganic rigid particle is one or more in talcum powder, barium sulfate, titanium dioxide, lime carbonate, mica powder, aluminum oxide, the white carbon black, and granularity is 1200～5000 orders, and preferred size is 3500～4500 orders;
Initiator is an organo-peroxide;
Initiator is di-t-butyl peroxide or two " 2,5 " vulcanizing agent (2, the 5-2); Preferred two " 2,5 " vulcanizing agent;
A kind of preparation method who prepares Cisdene-low density polyethylene cross-linked material as claimed in claim 1 is:
(1) with the cis-1,4-polybutadiene rubber of ratio of quality and the number of copies 50-80; The new LDPE (film grade) of ratio of quality and the number of copies 20-50; The inorganic rigid particle of ratio of quality and the number of copies 0-10; The peroxide initiator of ratio of quality and the number of copies 0.1-1 weighs up;
(2) cis-1,4-polybutadiene rubber is used the bale splitter pelletizing;
(3) order according to cis-1,4-polybutadiene rubber, new LDPE (film grade), inorganic rigid particle adds low speed mixer successively, under the normal temperature pre-mixing 2-3 minute;
(4) organic peroxide evocating agent was slowly added pre-composition in two minutes, normal temperature mixes taking-up in 6-8 minute down;
(5) material that mixes in (4) is added granulation in the homodromy parallel twin screw extruder, the granulation process condition is that (a) each section temperature is between 150-180 ℃; (b) screw speed is between 150-250 rev/min; (c) the feeding machine rotating speed is between 20-50 rev/min; The pelletizing of water ring die face hot-cutting machine.
The purposes of Cisdene-low density polyethylene cross-linked material is the toughening modifying of homo-polypropylene, improves the low-temperature impact toughness of homo-polypropylene.
Fourth rubber-polyethylene crosslinking substance in low density provided by the invention is used for the toughening modifying of homo-polypropylene, and it improves the principle of work of the low-temperature impact toughness of homo-polypropylene: cis-1,4-polybutadiene rubber has good wear resistance, winter hardiness, flexible resistance and snappiness.The crosslinking degree of Cisdene-low density polyethylene cross-linked material represents with degree of crosslinking, i.e. the per-cent of gel content and material resin total amount.The microtexture of Cisdene-low density polyethylene cross-linked material is observed with scanning electron microscope (SEM), this cross-linking agent has perfect relatively network structure, the inorganic rigid particle that is etched away by chromic acid is evenly distributed in the cross-linking system, forms typical " nuclear-shell " structure.The toughness reinforcing component of using as the homo-polypropylene toughening modifying, with compound uses of other auxiliary agents such as expanding material and oxidation inhibitor, under the effect of shear-stress, this toughened master batch can be scattered in the polypropylene matrix resin with littler more uniform fine micelle, absorb the impact energy that puts on matrix material effectively, thereby obtain significant toughening effect with less consumption, even if under-20 ℃ low temperature, because still contain two keys of some amount in the Cisdene-low density polyethylene cross-linked material, the flexibility of macromolecular chain still maintains higher level.
From above-mentioned principle of work as can be seen, the present invention compared with prior art, cross-linking agent of the present invention significantly improves the impelling strength of homo-polypropylene, its low-temperature impact toughness especially, and less to rigidity, the tensile property influence of homo-polypropylene; The low-temperature performance that cross-linking agent of the present invention acts on homo-polypropylene obviously is better than POE/ high density polyethylene(HDPE) toughened master batch.Simultaneously, under same consumption, Cisdene-low density polyethylene cross-linked material is compared with the POE thermoplastic elastomer, and the normal temperature shock strength of homo-polypropylene matrix material improves more than 2-4 times; Compare with POE/ high density polyethylene(HDPE) toughened master batch ,-20 ℃ shock strength of homo-polypropylene matrix material improves more than 2 times.In addition, compare with other elastomericss such as POE, the price of Cisdene-low density polyethylene cross-linked material of the present invention is lower.
Embodiment 1:
The numerical value of getting model and be 100 ℃ of BR9004A, mooney viscosity ML (1+4) is 40 cis-1,4-polybutadiene rubber 1800g; (density is 0.920g/cm to the new LDPE (film grade) that the high pressure vapor method is produced
3, melting index MI is 2.0g/10min) and 1191g; Organic peroxide evocating agent is di-t-butyl peroxide DTBP9g, inorganic rigid particle 0 gram.With BR9004A bale splitter pelletizing, again BR9004A and TN26 are put into low speed mixer in proper order earlier, normal temperature mixed 3 minutes down, slowly added DTBP again in two minutes, and normal temperature mixed 6 minutes down, formed mixture; Then, mixture is added granulation in the cocurrent and parallel twin screw extruder.Extruder temperature is distributed as, 150 ℃ of district's temperature, 160 ℃ of two district's temperature, 170 ℃ of three district's temperature, 180 ℃ of four district's temperature, 180 ℃ of five district's temperature, 180 ℃ of six district's temperature, 180 ℃ of seven district's temperature, 180 ℃ of eight district's temperature.200 rev/mins of screw speeds, 30 rev/mins of feeding machine rotating speeds; The water ring die face cutting, Cisdene-low density polyethylene cross-linked material, degree of crosslinking 50.2%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 168 3g obtain toughness reinforcing rigid polypropylene blend, its tensile strength: 26.10MPa; Elongation at break: 323%; Flexural strength: 28.3MPa; Modulus in flexure: 1211MPa; Notched Izod impact strength in the time of IZOD23 ℃: 523.3J/m; Notched Izod impact strength: 79.5J/m in the time of IZOD-20 ℃.
If do not add the cross-linking agent of gained, above polypropylene blend, its tensile strength: 33.5MPa; Elongation at break: 335%; Flexural strength: 35.2MPa; Modulus in flexure: 1182MPa; Notched Izod impact strength: 85.4J/m during 23 ℃ of IZOD; Notched Izod impact strength: 23.1J/m in the time of IZOD-20 ℃.
Its rigidity, loss of tensile strength were big and solve the problem of its low-temperature impact toughness when this cross-linking agent solved the toughness that improves homo-polypropylene, under the little situation of other performance impacts, normal temperature becomes several times increase with cryogenic impelling strength, shock strength in the time of-20 ℃ improves more than 2 times, and the normal temperature shock strength improves more than 4 times.
Embodiment 2:
Most of with embodiment 1, difference is, two " 2, the 5 " vulcanizing agents of organic peroxide evocating agent.This Cisdene-low density polyethylene cross-linked material degree of crosslinking 52.1%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 168 3g obtain toughness reinforcing rigidity homo-polypropylene blend, its tensile strength: 29.10MPa; Elongation at break: 325%; Flexural strength: 28.6MPa; Modulus in flexure: 1258MPa; Notched Izod impact strength in the time of IZOD23 ℃: 752.1J/m; Notched Izod impact strength in the time of IZOD-20 ℃: 87.9J/m.
If do not add the cross-linking agent of gained, but add ethylene-octene copolymer elastomerics (POE) 100 grams that model is ENGAGE8180, above polypropylene blend, its tensile strength: 25.2MPa; Elongation at break: 310%; Flexural strength: 29.3MPa; Modulus in flexure: 972MPa; Notched Izod impact strength: 193.7J/m during 23 ℃ of IZOD; Notched Izod impact strength in the time of IZOD-20 ℃: 31.5J/m.
Its rigidity, loss of tensile strength were big and solve the problem of its low-temperature impact toughness when this cross-linking agent solved the toughness that improves homo-polypropylene, under the little situation of other performance impacts, normal temperature becomes several times increase with cryogenic impelling strength, compare with POE/ high density polyethylene(HDPE) toughened master batch,-20 ℃ shock strength of homo-polypropylene matrix material improves more than 2 times, and the normal temperature shock strength improves more than 2 times.
Embodiment 3:
Most of with embodiment 1, difference is, the numerical value of getting model and be 100 ℃ of BR9004A, mooney viscosity ML (1+4) is 38 cis-1,4-polybutadiene rubber 1794g; (density is 0.923g/cm to the new LDPE (film grade) that the high pressure vapor method is produced
3, melting index MI is 3.2g/10min) and 1191g; Two " 2, the 5 " vulcanizing agents of organic peroxide evocating agent, 15 grams; 150 rev/mins of screw speeds, 20 rev/mins of feeding machine rotating speeds.This Cisdene-low density polyethylene cross-linked material degree of crosslinking 65.7%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 168 3g obtain toughness reinforcing rigidity homo-polypropylene blend, its tensile strength: 29.40MPa; Elongation at break: 317%; Flexural strength: 29.8MPa; Modulus in flexure: 1307MPa; Notched Izod impact strength in the time of IZOD23 ℃: 871.7J/m; Notched Izod impact strength: 89.0J/m in the time of IZOD-20 ℃.
If do not add the cross-linking agent of gained, above polypropylene blend, its tensile strength: 23.8MPa; Elongation at break: 359%; Flexural strength: 26.3MPa; Modulus in flexure: 952MPa; Notched Izod impact strength in the time of IZOD23 ℃: 187.8J/m; Notched Izod impact strength in the time of IZOD-20 ℃: 33.7J/m.
Its rigidity, loss of tensile strength were big and solve the problem of its low-temperature impact toughness when this cross-linking agent solved the toughness that improves homo-polypropylene, under the little situation of other performance impacts, normal temperature becomes several times increase with cryogenic impelling strength,-20 ℃ shock strength improves more than 2 times, and the normal temperature shock strength improves more than 2 times.
Embodiment 4:
Most of with embodiment 1, difference is that getting model is that 100 ℃ of BR9004A, mooney viscosity ML (1+4) are 45 cis-1,4-polybutadiene rubber 1574g; (density is 0.923g/cm to the long-chain branch new LDPE (film grade) that the high pressure vapor method is produced
3, melting index MI is 1.8g/10min) and 1111g; Organic peroxide evocating agent is two " 2,5 " vulcanizing agent 15g, and inorganic rigid particle is talcum powder 300g, and granularity is 3500 orders.This Cisdene-low density polyethylene cross-linked material degree of crosslinking 62.9%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 168 3g obtain toughness reinforcing rigidity homo-polypropylene blend, its tensile strength: 28.0MPa; Elongation at break: 297%; Flexural strength: 30.5MPa; Modulus in flexure: 1446MPa; Notched Izod impact strength in the time of IZOD23 ℃: 833.4J/m; Notched Izod impact strength: 77.6J/m in the time of IZOD-20 ℃.
If do not add the cross-linking agent of gained, above polypropylene blend, its tensile strength: 30.1MPa; Elongation at break: 322%; Flexural strength: 32.1MPa; Modulus in flexure: 1337MPa; Notched Izod impact strength: 387.4J/m during 23 ℃ of IZOD; Notched Izod impact strength: 33.3J/m in the time of IZOD-20 ℃.
Its rigidity, loss of tensile strength were big and solve the problem of its low-temperature impact toughness when this cross-linking agent solved the toughness that improves homo-polypropylene, under the little situation of other performance impacts, normal temperature becomes several times increase with cryogenic impelling strength,-20 ℃ shock strength improves more than 2 times, and the normal temperature shock strength improves more than 2 times.
Embodiment 5:
Most of difference is that inorganic rigid particle is white carbon black 300g with embodiment 4, and granularity is 4500 orders.This Cisdene-low density polyethylene cross-linked material degree of crosslinking 63.4%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 168 3g obtain toughness reinforcing rigidity homo-polypropylene blend, its tensile strength: 28.7MPa; Elongation at break: 301%; Flexural strength: 31.4MPa; Modulus in flexure: 1478MPa; Notched Izod impact strength in the time of IZOD23 ℃: 857.2J/m; Notched Izod impact strength: 87.2J/m in the time of IZOD-20 ℃.
Embodiment 6:
Most of with embodiment 1, difference is that getting model is that 100 ℃ of BR9004A, mooney viscosity ML (1+4) are 42 cis-1,4-polybutadiene rubber 1430g; (density is 0.920g/cm to the new LDPE (film grade) that the high pressure vapor method is produced
3, melting index MI is 2.0g/10min) and 1405g; Organic peroxide evocating agent is two " 2,5 " vulcanizing agent 15g, and inorganic rigid particle is the 150g that barium sulfate, titanium dioxide, lime carbonate, mica powder and aluminum oxide are divided equally, and granularity is 4000 orders; 250 rev/mins of screw speeds, 50 rev/mins of feeding machine rotating speeds; The water ring die face cutting, Cisdene-low density polyethylene cross-linked material, degree of crosslinking 63.7%.
This cross-linking agent 100g, adding model is the homo-polypropylene 648g of F401, model is the Co-polypropylene 247g of K8303, antioxidant 1010 2g, oxidation inhibitor 1683g obtains toughness reinforcing rigidity homo-polypropylene blend, its tensile strength: 29.3MPa; Elongation at break: 308%; Flexural strength: 33.2MPa; Modulus in flexure: 1473MPa; Notched Izod impact strength in the time of IZOD23 ℃: 831.0J/m; Notched Izod impact strength: 85.7J/m in the time of IZOD-20 ℃.
In sum, fourth rubber-polyethylene crosslinking substance in low density provided by the invention is used to strengthen the toughening modifying of homo-polypropylene, strengthen the low-temperature impact toughness of homo-polypropylene, because cis-1,4-polybutadiene rubber has good wear resistance, winter hardiness, flexible resistance and snappiness.Cisdene-low density polyethylene cross-linked material has perfect relatively network structure, and the inorganic rigid particle that is etched away by chromic acid is evenly distributed in the cross-linking system, forms typical " nuclear-shell " structure.The toughness reinforcing component of using as the homo-polypropylene toughening modifying, with compound uses of other auxiliary agents such as expanding material and oxidation inhibitor, under the effect of shear-stress, this toughened master batch can be scattered in the homo-polypropylene matrix resin with littler more uniform fine micelle, absorb the impact energy that puts on matrix material effectively, thereby obtain significant toughening effect with less consumption, even if under-20 ℃ low temperature, because still contain two keys of some amount in the Cisdene-low density polyethylene cross-linked material, the flexibility of macromolecular chain still maintains higher level.
The present invention compared with prior art, cross-linking agent of the present invention significantly improves the impelling strength of homo-polypropylene, its low-temperature impact toughness especially, and less to rigidity, the tensile property influence of homo-polypropylene; The low-temperature performance that cross-linking agent of the present invention acts on homo-polypropylene obviously is better than POE/ high density polyethylene(HDPE) toughened master batch.Simultaneously, under same consumption, Cisdene-low density polyethylene cross-linked material is compared with the POE thermoplastic elastomer, and the normal temperature shock strength of homo-polypropylene matrix material improves more than 2-4 times; Compare with POE/ high density polyethylene(HDPE) toughened master batch ,-20 ℃ shock strength of homo-polypropylene matrix material improves more than 2 times.In addition, compare with other elastomericss such as POE, the price of Cisdene-low density polyethylene cross-linked material of the present invention is lower.
Claims (8)
1, a kind of Cisdene-low density polyethylene cross-linked material, it is characterized in that: it is made up of following compositions: the peroxide initiator of the new LDPE (film grade) of the cis-1,4-polybutadiene rubber of ratio of quality and the number of copies 50-80, ratio of quality and the number of copies 20-50, the inorganic rigid particle of ratio of quality and the number of copies 0-10, ratio of quality and the number of copies 0.1-1; The numerical value that the crude rubber Mooney viscosity ML (1+4) of described cis-1,4-polybutadiene rubber is 100 ℃ is between 38-45; The long-branch-chain polyethylene that described new LDPE (film grade) is produced for the high pressure vapor method, density are between 0.919～0.923 gram/cubic centimetre, and melting index MI is between 1.8～3.2 grams/10 minutes.
2, Cisdene-low density polyethylene cross-linked material according to claim 1 is characterized in that: its degree of crosslinking of described Cisdene-low density polyethylene cross-linked material is between 50.2～65.7%.
3, Cisdene-low density polyethylene cross-linked material according to claim 1, it is characterized in that: described inorganic rigid particle is one or more in talcum powder, barium sulfate, titanium dioxide, lime carbonate, mica powder, aluminum oxide, the white carbon black, and granularity is 1200～5000 orders.
4, Cisdene-low density polyethylene cross-linked material according to claim 1 is characterized in that: described inorganic rigid particle granularity is 3500～4500 orders.
5, Cisdene-low density polyethylene cross-linked material according to claim 1 is characterized in that: described initiator is an organo-peroxide.
6, Cisdene-low density polyethylene cross-linked material according to claim 1 is characterized in that: described initiator is di-t-butyl peroxide or two " 2,5 " vulcanizing agent.
7, a kind of preparation method who prepares Cisdene-low density polyethylene cross-linked material as claimed in claim 1 is:
(1) with the cis-1,4-polybutadiene rubber of ratio of quality and the number of copies 50-80; The new LDPE (film grade) of ratio of quality and the number of copies 20-50; The inorganic rigid particle of ratio of quality and the number of copies 0-10; The peroxide initiator of ratio of quality and the number of copies 0.1-1 weighs up;
(2) cis-1,4-polybutadiene rubber is used the bale splitter pelletizing;
(3) order according to cis-1,4-polybutadiene rubber, new LDPE (film grade), inorganic rigid particle adds low speed mixer successively, under the normal temperature pre-mixing 2-3 minute;
(4) organic peroxide evocating agent was slowly added pre-composition in two minutes, normal temperature mixes taking-up in 6-8 minute down;
(5) material that mixes in (4) is added granulation in the homodromy parallel twin screw extruder, the granulation process condition is that (a) each section temperature is between 150-180 ℃; (b) screw speed is between 150-250 rev/min; (c) the feeding machine rotating speed is between 20-50 rev/min; The pelletizing of water ring die face hot-cutting machine.
8, the application of Cisdene-low density polyethylene cross-linked material as claimed in claim 1 is characterized in that: this cross-linking agent purposes is the toughening modifying of homo-polypropylene, improves the low-temperature impact toughness of homo-polypropylene.
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Owner name: LUOYANG PETRIFACTION JIRUN CHEMICAL CO., LTD. Free format text: FORMER NAME: LUOYANG PETRO-CHEMICAL POLYPROPYLENE CO., LTD. |
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Address after: 471012 Dagang Road, Jili District, Henan, Luoyang Patentee after: Luoyang Petrochemical auspicious Chemical Co., Ltd. Address before: 471012 Jili District, Luoyang, Henan Patentee before: Polypropylene Co., Ltd., Luoyang Petrochemical Corp. |
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Granted publication date: 20070321 Termination date: 20190118 |
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