CN115340759A - Method for improving strength of polymer melt - Google Patents
Method for improving strength of polymer melt Download PDFInfo
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- CN115340759A CN115340759A CN202211128555.5A CN202211128555A CN115340759A CN 115340759 A CN115340759 A CN 115340759A CN 202211128555 A CN202211128555 A CN 202211128555A CN 115340759 A CN115340759 A CN 115340759A
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- epoxidized
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- flexible polyester
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- 229920000642 polymer Polymers 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000000203 mixture Substances 0.000 claims abstract description 88
- 229920000728 polyester Polymers 0.000 claims abstract description 86
- 150000002148 esters Chemical class 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 238000000071 blow moulding Methods 0.000 claims abstract description 5
- 238000000748 compression moulding Methods 0.000 claims abstract description 5
- 238000005187 foaming Methods 0.000 claims abstract description 5
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 5
- 238000002156 mixing Methods 0.000 claims description 49
- 239000000155 melt Substances 0.000 claims description 48
- 238000002844 melting Methods 0.000 claims description 36
- 230000008018 melting Effects 0.000 claims description 36
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 36
- 239000004626 polylactic acid Substances 0.000 claims description 36
- 239000000178 monomer Substances 0.000 claims description 34
- VOZRXNHHFUQHIL-UHFFFAOYSA-N glycidyl methacrylate Chemical compound CC(=C)C(=O)OCC1CO1 VOZRXNHHFUQHIL-UHFFFAOYSA-N 0.000 claims description 25
- -1 polybutylene adipate-butylene terephthalate Polymers 0.000 claims description 24
- 239000004593 Epoxy Substances 0.000 claims description 21
- 229920000954 Polyglycolide Polymers 0.000 claims description 20
- 239000004633 polyglycolic acid Substances 0.000 claims description 20
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 19
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 19
- 229920001610 polycaprolactone Polymers 0.000 claims description 13
- 239000004632 polycaprolactone Substances 0.000 claims description 13
- 229920001577 copolymer Polymers 0.000 claims description 12
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 claims description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 8
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims description 6
- RRAFCDWBNXTKKO-UHFFFAOYSA-N eugenol Chemical compound COC1=CC(CC=C)=CC=C1O RRAFCDWBNXTKKO-UHFFFAOYSA-N 0.000 claims description 6
- 239000004310 lactic acid Substances 0.000 claims description 4
- 235000014655 lactic acid Nutrition 0.000 claims description 4
- JOLVYUIAMRUBRK-UHFFFAOYSA-N 11',12',14',15'-Tetradehydro(Z,Z-)-3-(8-Pentadecenyl)phenol Natural products OC1=CC=CC(CCCCCCCC=CCC=CCC=C)=C1 JOLVYUIAMRUBRK-UHFFFAOYSA-N 0.000 claims description 3
- YLKVIMNNMLKUGJ-UHFFFAOYSA-N 3-Delta8-pentadecenylphenol Natural products CCCCCCC=CCCCCCCCC1=CC=CC(O)=C1 YLKVIMNNMLKUGJ-UHFFFAOYSA-N 0.000 claims description 3
- JOLVYUIAMRUBRK-UTOQUPLUSA-N Cardanol Chemical compound OC1=CC=CC(CCCCCCC\C=C/C\C=C/CC=C)=C1 JOLVYUIAMRUBRK-UTOQUPLUSA-N 0.000 claims description 3
- FAYVLNWNMNHXGA-UHFFFAOYSA-N Cardanoldiene Natural products CCCC=CCC=CCCCCCCCC1=CC=CC(O)=C1 FAYVLNWNMNHXGA-UHFFFAOYSA-N 0.000 claims description 3
- NPBVQXIMTZKSBA-UHFFFAOYSA-N Chavibetol Natural products COC1=CC=C(CC=C)C=C1O NPBVQXIMTZKSBA-UHFFFAOYSA-N 0.000 claims description 3
- 239000005770 Eugenol Substances 0.000 claims description 3
- UVMRYBDEERADNV-UHFFFAOYSA-N Pseudoeugenol Natural products COC1=CC(C(C)=C)=CC=C1O UVMRYBDEERADNV-UHFFFAOYSA-N 0.000 claims description 3
- PTFIPECGHSYQNR-UHFFFAOYSA-N cardanol Natural products CCCCCCCCCCCCCCCC1=CC=CC(O)=C1 PTFIPECGHSYQNR-UHFFFAOYSA-N 0.000 claims description 3
- 229960002217 eugenol Drugs 0.000 claims description 3
- 125000003700 epoxy group Chemical group 0.000 claims description 2
- 239000013538 functional additive Substances 0.000 claims description 2
- 229920002961 polybutylene succinate Polymers 0.000 claims description 2
- 239000004631 polybutylene succinate Substances 0.000 claims description 2
- 235000015112 vegetable and seed oil Nutrition 0.000 claims description 2
- 239000008158 vegetable oil Substances 0.000 claims description 2
- 239000004416 thermosoftening plastic Substances 0.000 claims 1
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 4
- 238000010094 polymer processing Methods 0.000 abstract description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 39
- 238000002360 preparation method Methods 0.000 description 39
- 230000000052 comparative effect Effects 0.000 description 27
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 26
- 239000012299 nitrogen atmosphere Substances 0.000 description 24
- VSAWBBYYMBQKIK-UHFFFAOYSA-N 4-[[3,5-bis[(3,5-ditert-butyl-4-hydroxyphenyl)methyl]-2,4,6-trimethylphenyl]methyl]-2,6-ditert-butylphenol Chemical compound CC1=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C(CC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)C(C)=C1CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 VSAWBBYYMBQKIK-UHFFFAOYSA-N 0.000 description 19
- 239000003963 antioxidant agent Substances 0.000 description 19
- 230000003078 antioxidant effect Effects 0.000 description 19
- 239000004342 Benzoyl peroxide Substances 0.000 description 12
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 12
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 12
- 235000019400 benzoyl peroxide Nutrition 0.000 description 12
- 238000000746 purification Methods 0.000 description 12
- 239000007787 solid Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 239000002671 adjuvant Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 239000003999 initiator Substances 0.000 description 4
- 239000002861 polymer material Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 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 description 2
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 2
- ZRMMVODKVLXCBB-UHFFFAOYSA-N 1-n-cyclohexyl-4-n-phenylbenzene-1,4-diamine Chemical compound C1CCCCC1NC(C=C1)=CC=C1NC1=CC=CC=C1 ZRMMVODKVLXCBB-UHFFFAOYSA-N 0.000 description 1
- 239000004970 Chain extender Substances 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000010128 melt processing Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 239000004629 polybutylene adipate terephthalate Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F218/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid or of a haloformic acid
- C08F218/02—Esters of monocarboxylic acids
- C08F218/04—Vinyl esters
- C08F218/08—Vinyl acetate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/14—Methyl esters, e.g. methyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/02—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polycarbonates or saturated polyesters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Abstract
The invention discloses a method for improving the strength of a polymer melt, belonging to the technical field of polymer processing and modification. The invention is to melt and blend 90 to 100 parts of ester polymer, 0.1 to 6 parts of epoxidized flexible polyester, 0.5 to 10 parts of polyepoxy polymer and 0.1 to 3 parts of functional auxiliary agent at a certain temperature to obtain the composition with high melt strength and low fluidity loss. The composition provided by the invention has high melt strength, excellent toughness and low melt fluidity loss, and can be directly used for compression molding, foaming, blow molding and secondary molding to prepare thermoplastic plastic products.
Description
Technical Field
The invention relates to a method for improving the strength of a polymer melt, belonging to the technical field of polymer processing and modification.
Background
With the rapid development of polymer material industry, the application of polymer materials has penetrated into various fields of industry, agriculture and people's daily life, however, most of polymer materials are derived from petroleum base, are not easy to realize natural degradation and are difficult to recover at present. Polyglycolic acid, glycolic acid-based copolymer, polylactic acid, lactic acid-based copolymer, polyethylene terephthalate are all biodegradable high molecular materials, which have excellent degradability, no toxicity and good biocompatibility, but have the disadvantage of low melt strength in processing, so that they are modified.
At present, isocyanate, acid anhydride and phosphate chain extenders are added to improve the melt strength, but the substances have high volatility, pungent odor and certain toxicity, and limit the application of polyester in the fields of tableware, food packaging, children toys and the like. In addition, it has been reported that during the melt processing of ester polymer, organic peroxide can be added as initiator, such as benzoyl peroxide, dicumyl peroxide, etc. to generate free radicals, change the molecular chain structure and further improve the melt strength, but this method is liable to generate cross-linked structure, which deteriorates the fluidity of the system and even loses the melt processability.
In addition, the current methods for increasing the melt strength of polyglycolic acid, glycolic acid-based copolymers, polylactic acid, lactic acid-based copolymers, and polyethylene terephthalate do not effectively improve the brittleness of polyesters, and therefore, it is highly necessary to invent a new method for preparing a polymer composition having high melt strength, excellent melt flowability, and good toughness.
Disclosure of Invention
In view of the above problems of the prior art, the present invention provides a method for increasing the melt strength of a polymer and reducing the loss of flowability.
The invention aims to provide a method for improving the strength of a polymer melt and reducing the loss of fluidity, which comprises the steps of mixing, melting and blending epoxy flexible polyester and an ester polymer; then adding polyepoxy polymer to continue melt blending.
In one embodiment of the invention, the weight ratio of the ester polymer is 90-100 parts, the epoxidized flexible polyester is 0.1-6 parts, and the polyepoxy polymer is 0.5-10 parts.
In one embodiment of the invention, the method further comprises the steps of adding 0.1-3 parts of functional additive, melting and blending with the epoxidized flexible polyester and the ester polymer, and adding the polyepoxy polymer for continuous melting and blending according to the weight part ratio.
In one embodiment of the present invention, the epoxidized flexible polyester is further preferably 1 to 6 parts by weight.
In one embodiment of the present invention, the polyepoxy polymer is further preferably 1 to 8 parts by weight.
In one embodiment of the invention, the mass ratio of epoxidized flexible polyester to polyepoxy polymer is (1-6): (1-8); preferably (3-6): (2-5); further preferably (3-5): (3-5); further (3-4): (4-5).
In one embodiment of the present invention, the ester polymer is at least one of polyglycolic acid, a lactic acid-based copolymer, a glycolic acid-based copolymer, polylactic acid, and polyethylene terephthalate.
In one embodiment of the invention, the epoxidized flexible polyester is at least one of epoxy monomer-grafted polycaprolactone, epoxy monomer-grafted polybutylene adipate-terephthalate, epoxy monomer-grafted polybutylene succinate and epoxy monomer-grafted caprolactone-lactide copolymer.
In one embodiment of the present invention, the epoxidized flexible polyester contains 0.1 to 5 mass% of epoxy monomer.
In one embodiment of the invention, the epoxidized flexible polyester has a number average molecular weight of 0.5 to 5 ten thousand. Preferably 0.5 to 2 ten thousand.
In one embodiment of the present invention, the epoxidized flexible polyester is obtained by melt grafting a flexible polyester with an epoxy monomer under the action of a radical initiator.
In one embodiment of the invention, the epoxidized flexible polyester has a melt grafting temperature in the range of 110 to 180 ℃, such as 110 ℃,120 ℃,130 ℃,140 ℃,150 ℃,160 ℃,170 ℃,180 ℃ and the like.
In one embodiment of the present invention, the epoxy monomer used in the epoxidized flexible polyester is at least one of glycidyl methacrylate, epoxidized unsaturated vegetable oil, cardanol glycidyl ether and eugenol glycidyl ether.
In one embodiment of the invention, the mass ratio of the flexible polyester to the epoxy monomer is 100 (1-10); preferably, the ratio of 100.
In one embodiment of the invention, the polyepoxy polymer is polymerized from one or more monomers containing-C = C-, wherein at least one monomer contains an epoxy group.
In one embodiment of the present invention, the polyepoxy copolymer is obtained by dispersing the monomer A and the epoxy monomer B in an organic solvent, adding an initiator, and polymerizing.
In one embodiment of the invention, the polyepoxy polymer has a molecular weight number average molecular weight of 1 to 10 ten thousand.
In one embodiment of the present invention, the monomer a is at least one of vinyl acetate, methyl methacrylate, and styrene-based monomers. The epoxy monomer B is glycidyl methacrylate.
In one embodiment of the present invention, the polyepoxy copolymer has a molar percentage of epoxy monomer B of 3 to 50%.
In one embodiment of the invention, the mass ratio of monomer a to epoxy monomer B is (0.7-4): 1.
in one embodiment of the present invention, the organic solvent may be toluene.
In one embodiment of the invention, the concentration of epoxy monomer B relative to the organic solvent is from 0.1 to 0.5g/mL; specifically, 0.2g/mL or 0.4g/mL can be selected.
In one embodiment of the present invention, the initiator may be azobisisobutyronitrile.
In one embodiment of the invention, the polymerization temperature is from 50 to 70 ℃. For example, 65 ℃ may be selected.
In one embodiment of the present invention, the melt blending temperature is 1 to 50 ℃ above the melting point of the ester polymer. Specifically, the ester polymer may be selected at 1 deg.C, 5 deg.C, 10 deg.C, 20 deg.C, 30 deg.C, 40 deg.C, 50 deg.C above the melting point.
In one embodiment of the invention, the functional adjuvant is selected from: irganox 1330, polycarbodiimide, JL-5P, JL-WT, antioxidant 4010 and antioxidant RD.
The invention also aims to provide a high-melt-strength low-fluidity loss composition which is composed of 90-100 parts of ester polymer, 0.1-6 parts of epoxidized flexible polyester, 0.5-10 parts of polyepoxy polymer and 0.1-3 parts of functional assistant according to the weight part ratio.
In one embodiment of the present invention, the composition is prepared by a method comprising: firstly, ester polymer, epoxidized flexible polyester and functional auxiliary agent are melt blended for 0.01-5 minutes according to the mass ratio, then polyepoxy polymer is added according to the weight ratio and continuously melt blended for 1-10 minutes to obtain the composition, wherein the melt blending temperature is 1-50 ℃ above the melting point of the ester polymer, the melting point of the selected ester polymer is 1 ℃, 5 ℃, 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃ and the like, the melting point of polylactic acid is generally 160-180 ℃, the melting point of polyglycolic acid is generally 220-230 ℃, and the melting point of polyethylene glycol terephthalate is generally about 250 ℃.
The invention also provides the application of the composition with high melt strength and low fluidity loss in compression molding, foaming, blow molding and secondary molding to prepare thermoplastic plastic products.
The invention has the beneficial effects that:
(1) The invention relates to a method for improving polymer melt strength and reducing melt fluidity loss, which is characterized in that 90-100 parts of ester polymer, 0.1-5 parts of epoxidized flexible polyester, 0.5-10 parts of polyepoxy polymer and 0.1-3 parts of functional auxiliary agent are melted and blended at a certain temperature according to the weight part ratio to obtain a high melt strength low fluidity loss composition, and the epoxidized flexible polyester and the polyepoxy polymer can react with the end group of the ester polymer to form long chain branching so as to improve the melt strength.
(2) According to the invention, the addition amount and the feeding sequence are controlled, so that the epoxidized flexible polyester can form a sparse branched structure, a dense branched structure is formed in the polyepoxy polymer, and the two structures are mutually penetrated and interacted, so that the melt strength can be improved to the greatest extent.
(3) In addition, the invention can play a role in lubricating molecular chains by using a sparse branched structure generated by the flexible polyester, so that the melt strength of the system is improved, and the excellent fluidity is not lost.
(4) The functional assistant used in the invention basically does not influence the performance of high melt strength and low fluidity loss. The method of the invention is easy to realize on the traditional high polymer material processing equipment, and can be directly used for compression molding, foaming, blow molding and secondary molding to prepare thermoplastic plastic products.
Drawings
FIG. 1 is a stress-strain graph of examples 1-2 and comparative examples 1-2.
Detailed Description
The embodiments disclosed herein are examples of the present invention, which may be embodied in various forms. Therefore, specific details disclosed, including specific structural and functional details, are not intended to limit the invention, but merely serve as a basis for the claims. It should be understood that the detailed description of the invention is not intended to be limiting but is intended to cover all possible modifications, equivalents, and alternatives falling within the scope of the invention as defined by the appended claims. The word "may" is used throughout this application in an permissive sense rather than the mandatory sense. Similarly, unless otherwise specified, the words "include", "comprises", and "consisting of" mean "including but not limited to". The words "a" or "an" mean "at least one" and the words "a plurality" mean more than one. When abbreviations or technical terms are used, these terms are meant to have the generally accepted meaning known in the art.
Example 1
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester M) n = 10000), 3g of epoxy monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxy flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (M) n = 130000), 3g epoxidized flexible polyester and 1g functional adjuvant (antioxidant Irganox 1330) melt blended for 3 minutes, 5g polyepoxy polymer MG was added and melt blended for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
Example 2
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 20g of glycidyl methacrylate and 14.1g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.34g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 3 minutes, 5g of polyepoxy polymer MG was added and melt blending was continued for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
Example 3
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of vinyl acetate are added into a 250ml three-neck flask, mixed and exhausted for 2 hours under nitrogen atmosphere, 0.34g of azobisisobutyronitrile is added, and the mixture is reacted for 5 hours under nitrogen atmosphere at 65 ℃ to obtain a viscous product, and a solid sample after purification is recorded as VG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 1g of functional auxiliary agent (antioxidant Irganox 1330) are melt-blended for 3 minutes, 5g of polyepoxy polymer VG is added to continue melt-blending for 7 minutes to obtain a high melt-strength low-fluidity loss composition, wherein the melt-blending temperature is 190 ℃. (20 ℃ C. Above melting point)
Example 4
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 1g of epoxidized flexible polyester and 2g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 3 minutes, 8g of polyepoxy polymer MG was added and melt blending was continued for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 220 ℃ (50 ℃ above the melting point).
Example 5
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 5g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 1 minute, 1g of polyepoxy polymer MG was added and melt blending was continued for 9 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
Example 6
(1) Preparation of epoxidized flexible polyesters
100g of polybutylene adipate and terephthalate (flexible polyester Mn = 10000), 3g of epoxidized monomer eugenol glycidyl ether and 0.03g of dicumyl peroxide are melt-grafted in an internal mixer at 170 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt Strength Low flow loss compositions
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 3g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 3 minutes, 5g of polyepoxy polymer MG was added and melt blending was continued for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
Example 7
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer cardanol glycidyl ether and 0.03g of benzoyl peroxide are melt grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate, 17.6g of methyl methacrylate and 25.7g of styrene were put into a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.53g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as SMG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 3 minutes, 5g of polyepoxy polymer SMG was added and melt blending was continued for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
Example 8
The polylactic acid in example 1 was changed to polyglycolic acid (M) n = 150000), step (3) melt blending temperature 240 ℃ (10 ℃ above melting point), high melt strength high melt flow composition is obtained using the same method.
Example 9
The polylactic acid in example 2 was changed to polyglycolic acid (Mn = 150000), and the melt blending temperature in step (3) was 240 ℃ (10 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained in the same manner.
Example 10
The polylactic acid in example 3 was changed to polyglycolic acid (Mn = 150000), the melt blending temperature in step (3) was 240 ℃ (10 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained by the same method.
Example 11
The polylactic acid in example 4 was changed to polyglycolic acid (Mn = 150000), and the melt blending temperature in step (3) was 260 ℃ (30 ℃ above melting point), and a high melt strength low fluidity loss composition was obtained by the same method.
Example 12
The polylactic acid in example 5 was changed to polyglycolic acid (Mn = 150000), and the melt blending temperature in step (3) was 240 ℃ (10 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained by the same method.
Example 13
The polylactic acid in example 6 was changed to polyglycolic acid (Mn = 150000), and the melt blending temperature in step (3) was 240 ℃ (10 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained by the same method.
Example 14
The polylactic acid in example 7 was changed to polyglycolic acid (Mn = 150000), the melt blending temperature in step (3) was 240 ℃ (10 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained by the same method.
Example 15
The polylactic acid in example 1 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 255 ℃ (5 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained in the same manner.
Example 16
The polylactic acid in example 2 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 255 ℃ (5 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Example 17
The polylactic acid in example 3 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 255 ℃ (5 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Example 18
The polylactic acid in example 4 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 280 ℃ (30 ℃ above melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Example 19
The polylactic acid in example 5 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 255 ℃ (5 ℃ above melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Example 20
The polylactic acid in example 6 was changed to polyethylene terephthalate (Mn = 150000), and the melt blending temperature in step (3) was 255 ℃ (5 ℃ above the melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Example 21
The polylactic acid in example 7 was changed to polyethylene terephthalate (Mn = 150000), the melt blending temperature in step (3) was 255 ℃ (5 ℃ above melting point), and a high melt strength low fluidity loss composition was obtained using the same method.
Comparative example 1
100g of polylactic acid (Mn = 130000) and 1g of a functional aid (antioxidant Irganox 1330) were melt-blended at 190 ℃ for 10 minutes to obtain a composition.
Comparative example 2
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polylactic acid composition
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 1g of functional adjuvant (antioxidant Irganox 1330) were melt blended for 10 minutes to obtain a composition, wherein the melt blending temperature was 190 ℃.
Comparative example 3
(1) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(2) Preparation of polylactic acid composition
100g of polylactic acid (Mn = 130000), 5g of polyepoxy polymer MG and 1g of functional adjuvant (antioxidant Irganox 1330) were melt-blended for 10 minutes to obtain a composition, wherein the melt-blending temperature was 190 ℃.
Comparative example 4
100g of polyglycolic acid (Mn = 150000) and 1g of a functional aid (antioxidant Irganox 1330) were melt-blended at 240 ℃ for 10 minutes to obtain a composition.
Comparative example 5
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyglycolic acid composition
100g of polyglycolic acid (Mn = 150000), 3g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt-blended for 10 minutes to obtain a composition, wherein the melt-blending temperature was 240 ℃.
Comparative example 6
(1) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate are added into a 250ml three-neck flask, mixed and exhausted for 2 hours under nitrogen atmosphere, 0.45g of azobisisobutyronitrile is added, and the mixture is reacted for 5 hours under nitrogen atmosphere at 65 ℃ to obtain a viscous product, wherein a solid sample after purification is recorded as MG.
(2) Preparation of polyglycolic acid composition
100g of polyglycolic acid (Mn = 150000), 5g of polyepoxy polymer MG and 1g of functional adjuvant (antioxidant Irganox 1330) were melt-blended for 10 minutes to give a composition, wherein the melt-blending temperature was 240 ℃.
Comparative example 7
100g of polyethylene terephthalate (Mn = 150000) and 1g of a functional aid (antioxidant Irganox 1330) were melt-blended at 255 ℃ for 10 minutes to obtain a composition.
Comparative example 8
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyethylene terephthalate composition
100g of polyethylene terephthalate (Mn = 150000), 3g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt-blended for 10 minutes to obtain a composition, wherein the melt-blending temperature was 255 ℃.
Comparative example 9
(1) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(2) Preparation of polyethylene terephthalate composition
100g of polyethylene terephthalate (Mn = 150000), 5g of polyepoxy polymer MG and 1g of functional auxiliary (antioxidant Irganox 1330) were melt-blended for 10 minutes to give a composition, wherein the melt-blending temperature was 255 ℃.
It should be noted that the polyesters used in the above various examples and comparative examples were vacuum-dried at 60 ℃ for 12 hours before use.
The polylactic acid compositions of examples 1 to 7 and comparative examples 1 to 3 were subjected to a melt flow rate test using a melt flow rate tester, and the melt flow rate was measured at 190 ℃ for 5 minutes and then at 190 ℃ under 2.16 kg.
The polyglycolic acid compositions of examples 8 to 14 and comparative examples 4 to 6 were subjected to melt flow rate measurement using a melt flow rate meter, heat-maintained at 230 ℃ for 5 minutes, and then measured at 230 ℃ under 2.16 kg.
The polyethylene terephthalate compositions of examples 15 to 21 and comparative examples 7 to 9 were subjected to a melt flow rate test using a melt flow rate tester, and the compositions were kept at 250 ℃ for 5 minutes and then measured at 250 ℃ under 2.16 kg.
The Melt Strength (MS) of the compositions obtained in examples 1 to 21 and comparative examples 1 to 9 was calculated by the formula (1):
in the formula: Δ L — the length of the melt extrusion diameter when it is reduced to half;
r 0 -the radius of initial extrusion from the extruder die;
MFR-melt flow rate, g/10min.
The compositions obtained in examples 1 to 21 and comparative examples 1 to 9 were tested for tensile strength and elongation at break using a universal testing machine in accordance with GB/T1040.1 to 2018 at a tensile rate of 10mm/min.
The melt flow rate, melt strength, tensile strength and elongation at break of each of the examples and comparative examples tested are shown in table 1.
TABLE 1 melt flow rate, melt strength, tensile strength and elongation at break for each of the examples and comparative examples
Examples 1-7 and comparative examples 1-3 show that the polylactic acid combined by the epoxidized flexible polyester and the polyepoxy polymer can improve the melt strength to a new level, and the polylactic acid compositions of examples 1-7 have superior melt flowability compared to the lower melt flowability of comparative example 3. Compared with comparative examples 1-3, examples 1-7 modified with epoxidized flexible polyester and polyepoxy polymer have no major effect on tensile strength as a whole, but significantly improved elongation at break by more than 10 times. And similar final effects are obtained at different processing temperatures.
It can be seen from examples 8-14 and comparative examples 4-6 that polyglycolic acid, which is a combination of epoxidized flexible polyester and polyepoxy polymer, can improve the melt strength to a new level and that the polyglycolic acid compositions of examples 8-14 all have superior melt flowability as compared to the lower melt flowability of comparative example 6. Compared with comparative examples 4-6, examples 8-14, which were modified with epoxidized flexible polyester and polyepoxy polymer, did not have a large effect on tensile strength as a whole, but significantly increased the elongation at break by about 5 times. And similar final effects at different processing temperatures.
It can be seen from examples 15-21 and comparative examples 7-9 that the combination of epoxidized flexible polyester and polyepoxy polymer with polyethylene terephthalate can improve the melt strength to a new level, and that the polyethylene terephthalate compositions of examples 15-21 all have superior melt flow properties compared to the lower melt flow properties of comparative example 9. Compared with comparative examples 7-9, examples 15-21 modified with epoxidized flexible polyester and polyepoxy polymer have no significant effect on tensile strength as a whole, but significantly improved elongation at break by about 2 times. And similar final effects are obtained at different processing temperatures.
The above results fully demonstrate that the method provided by the present invention can obtain a high melt strength low fluidity loss composition, the composition provided by the present invention not only has higher melt strength but also has good fluidity and excellent toughness, and the good processability can be directly used for compression molding, foaming, blow molding and secondary molding to prepare thermoplastic plastic products.
Example 22
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), 3g of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), a certain amount of epoxidized flexible polyester and 1g of functional auxiliary agent (antioxidant Irganox 1330) are melt blended for 3 minutes, and a certain amount of polyepoxy polymer MG is added to continue melt blending for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature is 190 ℃ (20 ℃ above the melting point).
The melt flow rate, melt strength, tensile strength and elongation at break of the resulting compositions were tested as shown in table 2. TABLE 2 melt flow rate, melt strength, tensile strength and elongation at break of the compositions obtained with different amounts of epoxidized flexible polyester and MG
Example 23
(1) Preparation of epoxidized flexible polyesters
100g of polycaprolactone (flexible polyester Mn = 10000), a certain amount of epoxidized monomer glycidyl methacrylate and 0.03g of benzoyl peroxide are melt-grafted in an internal mixer at 130 ℃ for 5 minutes to obtain the epoxidized flexible polyester.
(2) Preparation of Polyepoxy polymers
50ml of toluene, 10g of glycidyl methacrylate and 35.2g of methyl methacrylate were added to a 250ml three-necked flask, mixed and exhausted under a nitrogen atmosphere for 2 hours, 0.45g of azobisisobutyronitrile was added, and the mixture was reacted at 65 ℃ under a nitrogen atmosphere for 5 hours to obtain a viscous product, and a solid sample after purification was designated as MG.
(3) Preparation of high melt strength low flow loss compositions
100g of polylactic acid (Mn = 130000), 3g of epoxidized flexible polyester and 1g of functional auxiliary (antioxidant Irganox 1330) were melt blended for 3 minutes, 5g of polyepoxy polymer MG was added and melt blending was continued for 7 minutes to obtain a high melt strength low flow loss composition, wherein the melt blending temperature was 190 ℃ (20 ℃ above melting point).
The melt flow rate, melt strength, tensile strength and elongation at break of the resulting compositions were tested as shown in Table 3.
TABLE 3 melt flow Rate, melt Strength, tensile Strength and elongation at Break of the compositions obtained with the different epoxidized Flexible polyesters
Those skilled in the art will understand that: the present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for improving the strength of polymer melt and reducing the loss of fluidity is characterized in that the method comprises the steps of mixing epoxidized flexible polyester, polyepoxy polymer and ester polymer, and then carrying out melt blending;
the epoxidized flexible polyester is at least one of epoxy monomer grafted polycaprolactone, epoxy monomer grafted polybutylene adipate-butylene terephthalate, epoxy monomer grafted polybutylene succinate and epoxy monomer grafted caprolactone-lactide copolymer;
the polyepoxy polymer is polymerized from one or more monomers containing-C = C-, wherein at least one of the monomers contains an epoxy group.
2. The method as claimed in claim 1, wherein the weight ratio of the ester polymer is 90-100 parts, the epoxidized flexible polyester is 0.1-6 parts, and the polyepoxy polymer is 0.5-10 parts.
3. The method of claim 1, further comprising adding 0.1-3 parts by weight of a functional additive.
4. The method of claim 1, wherein the mass ratio of epoxidized flexible polyester to polyepoxy polymer is (1-6): (1-8).
5. The method according to claim 1, wherein the ester polymer is at least one of polyglycolic acid, lactic acid-based copolymer, glycolic acid-based copolymer, polylactic acid, and polyethylene terephthalate.
6. The method according to any one of claims 1 to 5, wherein the epoxy monomer in the epoxidized flexible polyester is at least one of glycidyl methacrylate, epoxidized unsaturated vegetable oil, cardanol glycidyl ether and eugenol glycidyl ether.
7. A high melt strength low flow loss composition made by the process of any of claims 1-6.
8. The composition with high melt strength and low fluidity loss is characterized by comprising 90-100 parts of ester polymer, 0.1-6 parts of epoxidized flexible polyester, 0.5-10 parts of polyepoxy polymer and 0.1-3 parts of functional auxiliary agent according to the weight part ratio.
9. The high melt strength low flow loss composition of claim 8 prepared by a process comprising: firstly, melting and blending an ester polymer, epoxidized flexible polyester and a functional auxiliary agent according to a mass ratio, and then adding a polyepoxy polymer according to a weight part ratio for continuous melting and blending to obtain a composition; wherein the melt blending temperature is 1-50 ℃ above the melting point of the ester polymer.
10. Use of a high melt strength low flow loss composition according to claim 7 or 8 for compression molding, foaming, blow molding, post forming to make thermoplastic articles.
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