CN118126223A - Method for accelerating melt flow of tough synergistic polyolefin elastomer - Google Patents
Method for accelerating melt flow of tough synergistic polyolefin elastomer Download PDFInfo
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- 229920006124 polyolefin elastomer Polymers 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000002195 synergetic effect Effects 0.000 title claims abstract description 15
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052796 boron Inorganic materials 0.000 claims abstract description 39
- 239000000945 filler Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 19
- 239000000155 melt Substances 0.000 claims abstract description 14
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 150000002009 diols Chemical class 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 11
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000004327 boric acid Substances 0.000 claims abstract description 10
- BODYVHJTUHHINQ-UHFFFAOYSA-N (4-boronophenyl)boronic acid Chemical compound OB(O)C1=CC=C(B(O)O)C=C1 BODYVHJTUHHINQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229960004063 propylene glycol Drugs 0.000 claims abstract description 8
- 239000003999 initiator Substances 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 16
- 125000000524 functional group Chemical group 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 238000012360 testing method Methods 0.000 claims description 9
- 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 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 238000001746 injection moulding Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000002808 molecular sieve Substances 0.000 claims description 7
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 5
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 4
- ISAOCJYIOMOJEB-UHFFFAOYSA-N benzoin Chemical compound C=1C=CC=CC=1C(O)C(=O)C1=CC=CC=C1 ISAOCJYIOMOJEB-UHFFFAOYSA-N 0.000 claims description 4
- GHLKSLMMWAKNBM-UHFFFAOYSA-N dodecane-1,12-diol Chemical compound OCCCCCCCCCCCCO GHLKSLMMWAKNBM-UHFFFAOYSA-N 0.000 claims description 4
- -1 bispenta Chemical compound 0.000 claims description 3
- 229920002943 EPDM rubber Polymers 0.000 claims description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 244000028419 Styrax benzoin Species 0.000 claims description 2
- 235000000126 Styrax benzoin Nutrition 0.000 claims description 2
- 235000008411 Sumatra benzointree Nutrition 0.000 claims description 2
- 229960002130 benzoin Drugs 0.000 claims description 2
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 235000019382 gum benzoic Nutrition 0.000 claims description 2
- OEIJHBUUFURJLI-UHFFFAOYSA-N octane-1,8-diol Chemical compound OCCCCCCCCO OEIJHBUUFURJLI-UHFFFAOYSA-N 0.000 claims description 2
- 229920001223 polyethylene glycol Polymers 0.000 claims description 2
- 239000012965 benzophenone Substances 0.000 claims 1
- FOTKYAAJKYLFFN-UHFFFAOYSA-N decane-1,10-diol Chemical compound OCCCCCCCCCCO FOTKYAAJKYLFFN-UHFFFAOYSA-N 0.000 claims 1
- XGCTUKUCGUNZDN-UHFFFAOYSA-N [B].O=O Chemical compound [B].O=O XGCTUKUCGUNZDN-UHFFFAOYSA-N 0.000 abstract description 5
- 238000004132 cross linking Methods 0.000 abstract description 5
- 238000010382 chemical cross-linking Methods 0.000 abstract description 4
- 230000002427 irreversible effect Effects 0.000 abstract description 4
- 238000009717 reactive processing Methods 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 229920001971 elastomer Polymers 0.000 description 16
- 239000000806 elastomer Substances 0.000 description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- 238000012958 reprocessing Methods 0.000 description 3
- 239000004711 α-olefin Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 238000002288 cocrystallisation Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BRTALTYTFFNPAC-UHFFFAOYSA-N boroxin Chemical compound B1OBOBO1 BRTALTYTFFNPAC-UHFFFAOYSA-N 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- HHRKFGMMAHZWIM-UHFFFAOYSA-N ethenoxyboronic acid Chemical compound OB(O)OC=C HHRKFGMMAHZWIM-UHFFFAOYSA-N 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005649 metathesis reaction Methods 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000000974 shear rheometry Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention discloses a method for accelerating the melt flow of a tough synergistic polyolefin elastomer, which comprises the following raw materials: 100 parts of polyolefin elastomer, 0.01-5 parts of initiator, 0.5-10 parts of boron-containing cross-linking agent A and 1-100 parts of crystallizable boron-containing reticular filler B. Firstly preparing a boron-containing cross-linking agent A by 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, secondly preparing a crystallizable boron-containing reticular filler B by short-chain diol and boric acid, then sequentially adding a polyolefin elastomer, an initiator, the boron-containing cross-linking agent A and the crystallizable boron-containing reticular filler B, and carrying out polymer reactive mixing to obtain a dynamic cross-linked polyolefin elastomer, and finally adopting polymer secondary molding equipment for molding. The invention obtains the tough cooperative polyolefin elastomer through reactive processing, solves the problems of small quantity of boron-oxygen dynamic bonds and high melt viscosity caused by irreversible chemical crosslinking of a system in the dynamic crosslinking polyolefin elastomer, and develops a method for accelerating the melt flow of the tough cooperative polyolefin elastomer.
Description
Technical Field
The invention belongs to the field of thermoplastic elastomers, and particularly relates to a method for accelerating melt flow of a tough synergistic polyolefin elastomer.
Background
The polyolefin elastomer is synthesized by random copolymerization of ethylene and alpha-olefin (such as high alpha-olefin such as 1-butene, 1-hexene, 1-octene and the like), a crystallization zone of a polyethylene chain plays a role of a physical crosslinking point, the physical crosslinking point is stable at normal temperature and is melted after the temperature is higher than a melting point to obtain remolding processing capability, and the addition of the alpha-olefin weakens the crystallizability of the polyethylene chain and presents amorphous rubber elasticity, so that the polyolefin elastomer becomes one of important thermoplastic elastomer varieties.
Chemical crosslinking is an effective strategy to improve the heat resistance and dimensional stability of polyolefins. However, such irreversible chemical networks are detrimental to their scalability, greatly impairing the reprocessing and recyclability. Vitreous-like materials are a novel class of dynamic reversible covalent polymers, proposed by Leibler et al in 2011, which were first defined by their behavior to flow at high temperatures. Under the action of dynamic covalent bonds, the system maintains constant crosslinking density and dynamically variable topology, so that the glass-like body is represented as a thermosetting network at low temperature, and thermoplastic and reworkable capacities 【M.Rottger,T.Domenech,R.Weegen et.al.,High-performance vitrimers fromcommodity thermoplastics through dioxaborolane metathesis,Science,2017,356,62-65】. are represented at high temperature, and the high-temperature tensile properties of the polyolefin elastomer are greatly improved by introducing the vinyl borate crosslinking agent, but the free radical initiation reaction causes two defects: firstly, irreversible chemical crosslinking is unavoidable, so that the melt viscosity of the system is rapidly increased, and the reworkability of the modified elastomer is deteriorated; secondly, the effective access rate of free radical initiated grafting is low, so that the introduction amount of dynamic boron-oxygen bonds in the system is low, and the performance improvement range is limited. Therefore, there is a need to develop improvements in crosslinking system design and reactive processing techniques for dynamically crosslinked polyolefin elastomers to achieve both excellent service performance and reworkability.
Disclosure of Invention
The invention aims to develop a method for accelerating the melt flow of a tough collaborative polyolefin elastomer, which is based on a short-chain diol self-made dynamic boron-oxygen bond network as a structural filler, and forms a network structure of hard segment co-crystallization and soft segment dynamic bond interlocking by blending modification with the boron-oxygen dynamic cross-linked elastomer, so as to prepare the dynamic cross-linked polyolefin elastomer with a large number of boron-oxygen bonds, good compatibility and compact network, realize the cooperative promotion of strength and toughness, solve the problem of difficult reprocessing caused by high melt viscosity of a single dynamic cross-linked polyolefin elastomer, develop the reaction processing technology of the dynamic cross-linked polyolefin elastomer and realize the accelerating effect of melt flow.
In order to achieve the above purpose, the following technical scheme is adopted:
step one: weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to a characteristic functional group molar ratio of 1:1, adding a proper amount of molecular sieve or anhydrous magnesium sulfate, and continuously stirring to obtain a boron-containing crosslinking agent A;
Step two: weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B;
Step three: weighing 100 parts of polyolefin elastomer, 0.01-5 parts of initiator and 0.5-10 parts of boron-containing cross-linking agent A according to parts by weight, adopting a polymer reaction mixing mode, performing reactive mixing for 5-20 minutes, adding 1-50 parts of crystallizable boron-containing reticular filler B, and performing reactive mixing for 5-30 minutes to obtain a tough synergistic polyolefin elastomer;
Step four: and D, adopting polymer secondary molding equipment to mold the product obtained in the step three at the temperature of 60-250 ℃ and performing secondary molding processing to obtain a spline for testing.
The short-chain glycol in the second step is any one or combination of 1, 8-octanediol, 1, 10-sunflower glycol, 1, 12-dodecanediol and polyethylene glycol.
The polyolefin elastomer in the third step is any one of OBC, POE, EGMA, EPDM.
The initiator in the third step is any one of dicumyl peroxide, diphenyl ketone, biwu and benzoin dimethyl ether.
And step three, the tough collaborative polyolefin elastomer is of a dynamic cross-linked network structure.
The boron content of the tough synergistic polyolefin elastomer in the step III is 2.5 to 35 weight percent.
The polymer reaction mixing mode in the step three is any one of an internal mixer, an extruder and a two-roll open mill.
The polymer secondary forming equipment in the third step is any one of an injection molding machine, a vulcanizing press or a screw extrusion type 3D printer.
Aiming at the problems of small quantity of boron-oxygen dynamic bonds and high melt viscosity caused by irreversible chemical crosslinking of a system in the one-step method for preparing the dynamic crosslinked polyolefin elastomer, the invention adopts the short-chain diol and boric acid to prepare the boron-oxygen dynamic network as structural filler, realizes soft segment interlocking through dynamic bond exchange, realizes hard segment interconnection through a co-crystallization structure, obtains integrated dynamic boron-oxygen network, ensures two-phase compatibility, obviously reduces the melt viscosity and further improves the reprocessing performance of the dynamic crosslinked polyolefin elastomer while realizing the cooperative promotion of the strength and toughness of the elastomer, thereby developing a method for accelerating the melt flow of the tough cooperative polyolefin elastomer.
Compared with the prior art, the invention has the beneficial effects that:
1. The reaction processing process does not use solvent, is easy to batch, and has industrial production potential.
2. Breaks through the limitation of low grafting rate of the traditional free radical initiation reaction, and obviously improves the dynamic boron-oxygen bond content of the system.
3. The melt viscosity of the dynamic cross-linked polyolefin elastomer is obviously reduced, and the reworkability is improved.
Drawings
FIG. 1 photo of (a) reworkability and (b) shear viscosity of different elastomer samples
FIG. 2 brittle fracture surface topography of different elastomer samples
FIG. 3 (a) melting curve and (b) crystallization curve of different elastomer samples
FIG. 4 Room temperature stress strain curves for different elastomer samples
FIG. 5 shear rheology curves for different elastomer samples: (a) Dynamic modulus and (b) complex viscosity
FIG. 6 photograph of (a) synthetic chemical equation and (b) appearance of short chain boroxine dynamic network filler
Detailed Description
Example 1
Weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to the functional group molar ratio of 1:1, adding a proper amount of molecular sieve, and continuously stirring to obtain a boron-containing crosslinking agent A; weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, adopting an internal mixer to perform reactive mixing for 10 minutes at 190 ℃, adding 1 part of a crystallizable boron-containing reticular filler B, and adopting the internal mixer to perform reactive mixing for 10 minutes at 190 ℃ to obtain a tough synergistic polyolefin elastomer 1; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
Example 2
Weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to the functional group molar ratio of 1:1, adding a proper amount of molecular sieve, and continuously stirring to obtain a boron-containing crosslinking agent A; weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, adopting an internal mixer to perform reactive mixing for 10 minutes at 190 ℃, adding 5 parts of a crystallizable boron-containing reticular filler B, and adopting the internal mixer to perform reactive mixing for 10 minutes at 190 ℃ to obtain a tough synergistic polyolefin elastomer 2; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
Example 3
Weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to the functional group molar ratio of 1:1, adding a proper amount of molecular sieve, and continuously stirring to obtain a boron-containing crosslinking agent A; weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, adopting an internal mixer to perform reactive mixing for 10 minutes at 190 ℃, adding 10 parts of a crystallizable boron-containing reticular filler B, and adopting the internal mixer to perform reactive mixing for 10 minutes at 190 ℃ to obtain a tough synergistic polyolefin elastomer 3; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
Example 4
Weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to the functional group molar ratio of 1:1, adding a proper amount of molecular sieve, and continuously stirring to obtain a boron-containing crosslinking agent A; weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, adopting an internal mixer to perform reactive mixing for 10 minutes at 190 ℃, adding 20 parts of a crystallizable boron-containing reticular filler B, and adopting the internal mixer to perform reactive mixing for 20 minutes at 190 ℃ to obtain a tough synergistic polyolefin elastomer 4; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
Example 5
Weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to the functional group molar ratio of 1:1, adding a proper amount of molecular sieve, and continuously stirring to obtain a boron-containing crosslinking agent A; weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, adopting an internal mixer to perform reactive mixing for 10 minutes at 190 ℃, adding 40 parts of a crystallizable boron-containing reticular filler B, and adopting the internal mixer to perform reactive mixing for 20 minutes at 190 ℃ to obtain a tough synergistic polyolefin elastomer 5; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
Comparative example 1
Weighing 100 parts of an OBC elastomer, 0.5 part of dicumyl peroxide, 5 parts of a boron-containing cross-linking agent A, and performing reactive mixing for 10 minutes at 190 ℃ by adopting an internal mixer to obtain a dynamic cross-linked polyolefin elastomer 1; and finally, performing compression molding, setting the temperature to 190 ℃, setting the pressure to 20MPa, performing hot pressing for 10min, and cutting by using a sample cutter to obtain a sample for testing.
Comparative example 2
Weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B; weighing 100 parts of OBC elastomer, 10 parts of crystallizable boron-containing reticular filler B, and performing reactive mixing for 10 minutes at 190 ℃ by adopting an internal mixer to obtain a dynamic cross-linked polyolefin elastomer 2; finally, a miniature injection molding machine is adopted, the molding temperature is 190 ℃, and a spline is obtained for testing.
The foregoing description is only exemplary of the preferred embodiments of the invention and is not intended to limit the invention in any way or in any way whatsoever, but rather, modifications and additions may be made without changing the process of the invention which are also to be considered as being within the scope of the invention. Equivalent changes and modifications made by those skilled in the art using the teachings disclosed above should be considered equivalent embodiments of the present invention, and still fall within the scope of the present invention without departing from the scope thereof.
Claims (8)
1. A method for accelerating the melt flow of a tough co-type polyolefin elastomer is characterized by comprising the following steps:
step one: weighing 1, 4-phenyldiboronic acid and 3-allyloxy-1, 2-propylene glycol, proportioning according to a characteristic functional group molar ratio of 1:1, adding a proper amount of molecular sieve or anhydrous magnesium sulfate, and continuously stirring to obtain a boron-containing crosslinking agent A;
Step two: weighing short-chain diol and boric acid, placing the mixture in an oil bath kettle according to the molar ratio of the characteristic functional groups of 1:1, heating and stirring for 10 hours at 120 ℃, taking out gel, and placing the gel in a vacuum oven for heat treatment for 10 hours at 60 ℃ to obtain a crystallizable boron-containing reticular filler B;
Step three: weighing 100 parts of polyolefin elastomer, 0.01-5 parts of initiator and 0.5-10 parts of boron-containing cross-linking agent A according to parts by weight, adopting a polymer reaction mixing mode, performing reactive mixing for 5-20 minutes, adding 1-100 parts of crystallizable boron-containing reticular filler B, and performing reactive mixing for 5-30 minutes to obtain a tough synergistic polyolefin elastomer;
Step four: and D, adopting polymer secondary molding equipment to mold the product obtained in the step three at the temperature of 60-250 ℃ and performing secondary molding processing to obtain a spline for testing.
2. The method for accelerating the melt flow of the tough and synergistic polyolefin elastomer according to claim 1, wherein the short chain diol is any one or a combination of 1, 8-octanediol, 1, 10-decanediol, 1, 12-dodecanediol and polyethylene glycol.
3. The method of claim 1, wherein the polyolefin elastomer is one of OBC, POE, EGMA, EPDM.
4. The method for accelerating the melt flow of a tough synergistic polyolefin elastomer according to claim 1, wherein the initiator is any one of dicumyl peroxide, benzophenone, bispenta, benzoin dimethyl ether.
5. The method for accelerating the melt flow of a tough co-polyolefin elastomer according to claim 1, wherein the tough co-polyolefin elastomer has a dynamic cross-linked network structure.
6. The method for accelerating the melt flow of a tough co-polyolefin elastomer according to claim 1, wherein the tough co-polyolefin elastomer has a boron content of 2.5 to 35wt%.
7. The method for accelerating the melt flow of the tough and synergetic polyolefin elastomer according to claim 1, wherein the polymer reaction mixing mode is any one of an internal mixer, an extruder and a two-roll mill.
8. The method for accelerating the melt flow of a tough co-polyolefin elastomer according to claim 1, wherein the polymer secondary molding equipment is any one of an injection molding machine, a flat vulcanizing machine or a screw extrusion type 3D printer.
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