CN117801236A - Preparation method of 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material - Google Patents
Preparation method of 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material Download PDFInfo
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- CN117801236A CN117801236A CN202311833211.9A CN202311833211A CN117801236A CN 117801236 A CN117801236 A CN 117801236A CN 202311833211 A CN202311833211 A CN 202311833211A CN 117801236 A CN117801236 A CN 117801236A
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- esterification reaction
- naphthalene dicarboxylic
- dicarboxylic acid
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- 229920001896 polybutyrate Polymers 0.000 title claims abstract description 47
- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 29
- 230000015556 catabolic process Effects 0.000 title claims abstract description 27
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000005886 esterification reaction Methods 0.000 claims abstract description 122
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000007806 chemical reaction intermediate Substances 0.000 claims abstract description 45
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 claims abstract description 28
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- 238000006068 polycondensation reaction Methods 0.000 claims abstract description 20
- 235000011037 adipic acid Nutrition 0.000 claims abstract description 14
- 239000001361 adipic acid Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 229920000642 polymer Polymers 0.000 claims abstract description 9
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 14
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical compound [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000032050 esterification Effects 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 239000000543 intermediate Substances 0.000 abstract 1
- 239000006227 byproduct Substances 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000007599 discharging Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 229920000704 biodegradable plastic Polymers 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920001634 Copolyester Polymers 0.000 description 1
- PTIXVVCRANICNC-UHFFFAOYSA-N butane-1,1-diol;hexanedioic acid Chemical compound CCCC(O)O.OC(=O)CCCCC(O)=O PTIXVVCRANICNC-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- -1 polybutylene terephthalate Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/185—Acids containing aromatic rings containing two or more aromatic rings
- C08G63/187—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings
- C08G63/189—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings containing a naphthalene ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyesters Or Polycarbonates (AREA)
Abstract
A preparation method of a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material relates to a preparation method of a degradation material, which comprises the following preparation steps: mixing adipic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a first esterification reaction to obtain a first esterification reaction intermediate; mixing terephthalic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a second esterification reaction to obtain a second esterification reaction intermediate; mixing 2, 6-naphthalene dicarboxylic acid, 1, 4-butanediol and a catalyst according to mass ratio, and performing a third esterification reaction to obtain a third esterification reaction intermediate; and (3) putting the intermediate and the catalyst into a polymerization reaction kettle for polycondensation reaction to obtain the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer. The invention can improve the elastic modulus and tensile strength of PBAT while ensuring the original excellent toughness and impact resistance of PBAT, and can be applied to the preparation of polymers, thereby widening the application range of PBAT.
Description
Technical Field
The invention relates to a preparation method of a modified PBAT degradation material, in particular to a preparation method of a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material.
Background
The PBAT belongs to thermoplastic biodegradable plastics, is a copolymer of butanediol adipate and polybutylene terephthalate, has the characteristics of PBA and PBT, has good ductility and elongation at break, and has good heat resistance and impact resistance; in addition, the material also has excellent biodegradability, is one of the most popular and most commercially available degradable materials in the research of biodegradable plastics, and has the defects of poor crystallization performance, about 30% of crystallinity, poor strength and low elastic modulus.
Most of the current studies are based on blending modification of PBAT. Compatibility problems in blending modification and a certain degree of thermal degradation of PBAT by secondary processing result in reduced performance of the blend. Thus modifying the PBAT into a new direction by copolymerization.
Disclosure of Invention
The invention aims to provide a preparation method of a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material, which can ensure the original excellent toughness and impact resistance of PBAT and improve the elastic modulus and tensile strength of PBAT.
The invention aims at realizing the following technical scheme:
a preparation method of a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material, which comprises the following preparation processes:
(1) mixing adipic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a first esterification reaction to obtain a first esterification reaction intermediate;
(2) mixing terephthalic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a second esterification reaction to obtain a second esterification reaction intermediate;
(3) mixing 2, 6-naphthalene dicarboxylic acid, 1, 4-butanediol and a catalyst according to mass ratio, and performing a third esterification reaction to obtain a third esterification reaction intermediate;
(4) and putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and the catalyst into a polymerization reaction kettle for polycondensation reaction to obtain the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material comprises the steps that the alcohol-acid ratio of the first esterification reaction, the second esterification reaction and the third esterification reaction is 1.4:1; the adopted catalysts are tetrabutyl titanate; the reaction temperature was 200 ℃.
The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material comprises the step that the addition amount of a first esterification catalyst is 0.5% of the mass of adipic acid; the addition amount of the second esterification catalyst is 0.5% of the mass of terephthalic acid; the addition amount of the third esterification catalyst was 0.5% by mass of 2, 6-naphthalene dicarboxylic acid.
In the preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material, in the first esterification reaction, the second esterification reaction and the third esterification reaction, when the water yield of the esterification reaction reaches 98% of the theoretical water yield, the reaction is ended.
The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material comprises the following steps that a catalyst adopted in the polycondensation reaction is stannous octoate; the polycondensation temperature was 250 ℃.
According to the preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material, the addition amount of the polycondensation catalyst is 0.5-0.9%, preferably 0.7% of the total mass of adipic acid, terephthalic acid and 2, 6-naphthalene dicarboxylic acid.
The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material comprises the steps of carrying out polycondensation under the vacuum condition of 0Pa-50Pa, and terminating the polycondensation when the intrinsic viscosity of the reaction system reaches 0.72dL/g-0.75 dL/g.
The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material is characterized by comprising the following raw materials in percentage by weight:
146g of adipic acid;
378g of 1, 4-butanediol;
166g of terephthalic acid;
216g of 2, 6-naphthalene dicarboxylic acid;
tetrabutyl titanate 2.64g;
2.64-4.75 g of stannous octoate.
The invention has the advantages and positive effects that:
preparation of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material ensures the original excellent toughness and impact resistance of PBAT and improves the elastic modulus and tensile strength of PBAT. The method can avoid the problems of poor compatibility and unstable secondary processing performance of the blending modification method, obtain the PBAT copolyester with good comprehensive performance, and greatly widen the application range of the PBAT.
Drawings
FIG. 1 is a reaction scheme of a first esterification reaction according to the present invention;
FIG. 2 is a reaction scheme of a second esterification reaction according to the present invention;
FIG. 3 is a reaction scheme of a third esterification reaction according to the present invention;
FIG. 4 is a reaction mechanism diagram of the polycondensation reaction of the present invention.
Detailed Description
The present invention will be described in further detail below: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of protection of the present invention is not limited to the following embodiments.
Example 1
(1) 146g of adipic acid, 126g of 1, 4-butanediol and 0.73g of tetrabutyl titanate are added into a first esterification reaction kettle, a first esterification reaction is carried out at 200 ℃, and when the byproduct water yield of the esterification reaction reaches 98% of the theoretical water yield, a first esterification reaction intermediate is obtained; (2) 166g of terephthalic acid, 126g of 1, 4-butanediol and 0.83g of tetrabutyl titanate are added into a second esterification reaction kettle according to the proportion, a second esterification reaction is carried out at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a second esterification reaction intermediate is obtained; (3) 216g of 2, 6-naphthalene dicarboxylic acid, 126g of 1, 4-butanediol and 1.08g of tetrabutyl titanate are added into a third esterification reaction kettle to carry out a third esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a third esterification reaction intermediate is obtained; (4) and (3) putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and 2.64g of stannous octoate into a polymerization reaction kettle for polycondensation reaction under the conditions of 250 ℃ and vacuum of 0Pa-50P, and when the range of the intrinsic viscosity number of the reaction system reaches 0.72dL/g-0.75dL/g, turning off the vacuum and discharging under the protection of nitrogen, thereby obtaining the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
Example 2
(1) 146g of adipic acid, 126g of 1-butanediol and 0.73g of tetrabutyl titanate are added into a first esterification reaction kettle to carry out a first esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a first esterification reaction intermediate is obtained; (2) 166g of terephthalic acid, 126g of 1, 4-butanediol and 0.83g of tetrabutyl titanate are added into a second esterification reaction kettle according to the proportion, a second esterification reaction is carried out at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a second esterification reaction intermediate is obtained; (3) 216g of 2, 6-naphthalene dicarboxylic acid, 126g of 1, 4-butanediol and 1.08g of tetrabutyl titanate are added into a third esterification reaction kettle to carry out a third esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a third esterification reaction intermediate is obtained; (4) and (3) putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and 3.16g of stannous octoate into a polymerization reaction kettle for polycondensation reaction under the conditions of 250 ℃ and vacuum of 0Pa-50P, and when the range of the intrinsic viscosity number of the reaction system reaches 0.72dL/g-0.75dL/g, turning off the vacuum and discharging under nitrogen protection to obtain the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
Example 3
(1) 146g of adipic acid, 126g of 1, 4-butanediol and 0.73g of tetrabutyl titanate are added into a first esterification reaction kettle, a first esterification reaction is carried out at 200 ℃, and when the byproduct water yield of the esterification reaction reaches 98% of the theoretical water yield, a first esterification reaction intermediate is obtained; (2) 166g of terephthalic acid, 126g of 1, 4-butanediol and 0.83g of tetrabutyl titanate are added into a second esterification reaction kettle according to the proportion, a second esterification reaction is carried out at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a second esterification reaction intermediate is obtained; (3) 216g of 2, 6-naphthalene dicarboxylic acid, 126g of 1, 4-butanediol and 1.08g of tetrabutyl titanate are added into a third esterification reaction kettle to carry out a third esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a third esterification reaction intermediate is obtained; (4) and (3) putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and 3.69g of stannous octoate into a polymerization reaction kettle for polycondensation reaction under the conditions of 250 ℃ and vacuum of 0Pa-50P, and when the range of the intrinsic viscosity number of the reaction system reaches 0.72dL/g-0.75dL/g, turning off the vacuum and discharging under nitrogen protection to obtain the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
Example 4
(1) 146g of adipic acid, 126g of 1, 4-butanediol and 0.73g of tetrabutyl titanate are added into a first esterification reaction kettle, a first esterification reaction is carried out at 200 ℃, and when the byproduct water yield of the esterification reaction reaches 98% of the theoretical water yield, a first esterification reaction intermediate is obtained; (2) 166g of terephthalic acid, 126g of 1, 4-butanediol and 0.83g of tetrabutyl titanate are added into a second esterification reaction kettle according to the proportion, a second esterification reaction is carried out at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a second esterification reaction intermediate is obtained; (3) 216g of 2, 6-naphthalene dicarboxylic acid, 126g of 1, 4-butanediol and 1.08g of tetrabutyl titanate are added into a third esterification reaction kettle to carry out a third esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a third esterification reaction intermediate is obtained; (4) and (3) putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and 4.22g of stannous octoate into a polymerization reaction kettle for polycondensation reaction under the conditions of 250 ℃ and vacuum of 0Pa-50P, and when the range of the intrinsic viscosity number of the reaction system reaches 0.72dL/g-0.75dL/g, turning off the vacuum and discharging under the protection of nitrogen, thereby obtaining the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
Example 5
(1) 146g of adipic acid, 126g of 1, 4-butanediol and 0.73g of tetrabutyl titanate are added into a first esterification reaction kettle, a first esterification reaction is carried out at 200 ℃, and when the byproduct water yield of the esterification reaction reaches 98% of the theoretical water yield, a first esterification reaction intermediate is obtained; (2) 166g of terephthalic acid, 126g of 1, 4-butanediol and 0.83g of tetrabutyl titanate are added into a second esterification reaction kettle according to the proportion, a second esterification reaction is carried out at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a second esterification reaction intermediate is obtained; (3) 216g of 2, 6-naphthalene dicarboxylic acid, 126g of 1, 4-butanediol and 1.08g of tetrabutyl titanate are added into a third esterification reaction kettle to carry out a third esterification reaction at 200 ℃, and when the water yield of byproducts of the esterification reaction reaches 98% of the theoretical water yield, a third esterification reaction intermediate is obtained; (4) and (3) putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and 4.75g of stannous octoate into a polymerization reaction kettle for polycondensation reaction under the conditions of 250 ℃ and vacuum of 0Pa-50P, and when the range of the intrinsic viscosity number of the reaction system reaches 0.72dL/g-0.75dL/g, turning off the vacuum and discharging under the protection of nitrogen, thereby obtaining the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
The properties of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation materials prepared in examples 1 to 5 of the present invention are compared with the following table:
| elongation at break (%) | Tensile Strength (MPa) | Modulus of elasticity (MPa) | |
| Example 1 | 620 | 35 | 130 |
| Example 2 | 640 | 36 | 143 |
| Example 3 | 680 | 39 | 162 |
| Example 4 | 670 | 38 | 156 |
| Example 5 | 660 | 37 | 150 |
| Comparative example | 600 | 34 | 135 |
From the table, the elastic modulus of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material is obviously improved, and the performance is optimal when the adding amount of the catalyst stannous octoate in the polycondensation reaction is 0.7%, so that the defect of insufficient PBAT strength is overcome.
Claims (8)
1. The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material is characterized by comprising the following preparation processes:
(1) mixing adipic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a first esterification reaction to obtain a first esterification reaction intermediate;
(2) mixing terephthalic acid, 1, 4-butanediol and a catalyst according to mass ratio, and then carrying out a second esterification reaction to obtain a second esterification reaction intermediate;
(3) mixing 2, 6-naphthalene dicarboxylic acid, 1, 4-butanediol and a catalyst according to mass ratio, and performing a third esterification reaction to obtain a third esterification reaction intermediate;
(4) and putting the first esterification reaction intermediate, the second esterification reaction intermediate, the third esterification reaction intermediate and the catalyst into a polymerization reaction kettle for polycondensation reaction to obtain the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT polymer.
2. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material according to claim 1, wherein the alcohol-acid ratio of the first esterification reaction, the second esterification reaction and the third esterification reaction is 1.4:1; the adopted catalysts are tetrabutyl titanate; the reaction temperature was 200 ℃.
3. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material according to claim 2, wherein the addition amount of the first esterification catalyst is 0.5% of the mass of adipic acid; the addition amount of the second esterification catalyst is 0.5% of the mass of terephthalic acid; the addition amount of the third esterification catalyst was 0.5% by mass of 2, 6-naphthalene dicarboxylic acid.
4. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material according to claim 1, wherein the first esterification reaction, the second esterification reaction and the third esterification reaction are completed when the water yield of the esterification reaction reaches 98% of the theoretical water yield.
5. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material according to claim 1, wherein the catalyst used in the polycondensation reaction is stannous octoate; the polycondensation temperature was 250 ℃.
6. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material as claimed in claim 5, wherein the addition amount of the polycondensation catalyst is 0.5-0.9%, preferably 0.7% of the total mass of adipic acid, terephthalic acid and 2, 6-naphthalene dicarboxylic acid.
7. The method for preparing a 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material as claimed in claim 5, wherein the polycondensation reaction is performed under vacuum condition of 0Pa-50Pa, and the polycondensation reaction is terminated when the intrinsic viscosity of the reaction system reaches 0.72dL/g-0.75 dL/g.
8. The preparation method of the 2, 6-naphthalene dicarboxylic acid molecular structure modified PBAT degradation material as claimed in claim 1, wherein the specific mass of the material raw material proportioning is as follows:
146g of adipic acid;
378g of 1, 4-butanediol;
166g of terephthalic acid;
216g of 2, 6-naphthalene dicarboxylic acid;
tetrabutyl titanate 2.64g;
2.64-4.75 g of stannous octoate.
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