CN117623966A - Synthesis and application of recycled polyethylene terephthalate auxiliary agent from green source - Google Patents
Synthesis and application of recycled polyethylene terephthalate auxiliary agent from green source Download PDFInfo
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- CN117623966A CN117623966A CN202311728437.2A CN202311728437A CN117623966A CN 117623966 A CN117623966 A CN 117623966A CN 202311728437 A CN202311728437 A CN 202311728437A CN 117623966 A CN117623966 A CN 117623966A
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- polyethylene terephthalate
- recycled polyethylene
- auxiliary agent
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- -1 polyethylene terephthalate Polymers 0.000 title claims abstract description 79
- 229920000139 polyethylene terephthalate Polymers 0.000 title claims abstract description 78
- 239000005020 polyethylene terephthalate Substances 0.000 title claims abstract description 78
- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 34
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 13
- 238000003786 synthesis reaction Methods 0.000 title claims abstract description 13
- 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 19
- MTCFGRXMJLQNBG-UHFFFAOYSA-N Serine Natural products OCC(N)C(O)=O MTCFGRXMJLQNBG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000004064 recycling Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 22
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000013067 intermediate product Substances 0.000 claims description 4
- 229940098779 methanesulfonic acid Drugs 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000002425 crystallisation Methods 0.000 abstract description 26
- 230000008025 crystallization Effects 0.000 abstract description 26
- 239000002994 raw material Substances 0.000 abstract description 16
- 239000000126 substance Substances 0.000 abstract description 8
- 238000011161 development Methods 0.000 abstract description 4
- 238000010899 nucleation Methods 0.000 abstract description 4
- 230000006911 nucleation Effects 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 230000002194 synthesizing effect Effects 0.000 abstract description 2
- 238000006386 neutralization reaction Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 24
- 238000002156 mixing Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 14
- 238000011084 recovery Methods 0.000 description 14
- 238000001746 injection moulding Methods 0.000 description 11
- 235000013361 beverage Nutrition 0.000 description 10
- 238000012360 testing method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 125000000524 functional group Chemical group 0.000 description 4
- 238000010128 melt processing Methods 0.000 description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000012795 verification Methods 0.000 description 3
- 239000002202 Polyethylene glycol Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 125000004185 ester group Chemical group 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920001223 polyethylene glycol Polymers 0.000 description 2
- 230000035484 reaction time Effects 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
- 239000002699 waste material Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C227/00—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton
- C07C227/14—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton from compounds containing already amino and carboxyl groups or derivatives thereof
- C07C227/16—Preparation of compounds containing amino and carboxyl groups bound to the same carbon skeleton from compounds containing already amino and carboxyl groups or derivatives thereof by reactions not involving the amino or carboxyl groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/175—Amines; Quaternary ammonium compounds containing COOH-groups; Esters or salts thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses synthesis and application of a green-source recycled polyethylene terephthalate auxiliary agent, which can greatly improve the crystallization temperature and the intrinsic viscosity of the recycled polyethylene terephthalate through the actions of attached crystallization, chemical nucleation and the like. Most importantly, the raw material terephthalic acid for synthesizing the auxiliary agent can be obtained by depolymerizing the recycled polyethylene terephthalate, and the other raw material serine has a bio-based source, so that the green source attribute of the raw material is truly achieved, and the auxiliary agent has important significance for the development of the mechanical recycling industry of the polyethylene terephthalate under the background of carbon peak and carbon neutralization at present.
Description
Technical Field
The invention relates to synthesis and application of a green-source recycled polyethylene terephthalate auxiliary agent, and belongs to the technical field of high polymer materials.
Background
Polyethylene terephthalate is an engineering plastic with excellent performance, and is mainly applied to the aspects of food, beverage packaging and the like. With the rapid development of industry, the demand of polyethylene terephthalate is increasing, and a large amount of polyethylene terephthalate is accumulated in natural environment and is difficult to be degraded by air or microorganisms, which causes serious harm to the production and life of human beings. Therefore, efficient polyethylene terephthalate recovery and reuse is critical, which helps to reduce waste production, reduce the need for limited resources, and reduce negative environmental impact.
Currently, the usual methods for recovering polyethylene terephthalate are chemical recovery and mechanical recovery. The chemical recovery method utilizes catalytic depolymerization and other methods to degrade polyethylene terephthalate into 'green source' terephthalic acid, ethylene glycol and the like. However, the complex operation of this process results in its limited ability to solve the polyethylene terephthalate recovery problem. The mechanical recovery method is to crush and classify waste polyethylene terephthalate products, and then obtain regenerated polyethylene terephthalate particles by a melt processing mode. However, the moisture and ultraviolet rays in the early use process of the product can lead to the breakage of the molecular chains, and in the secondary processing process after recovery, the molecular chain breakage phenomenon is more serious due to secondary heating, which directly leads to the rapid reduction of the intrinsic viscosity after recovery processing, the continuous deterioration of the crystallization performance, and the requirement of high-performance products is difficult to meet.
In the current "two carbon" context, not only is the base polymer required to have a "green" source, but there is also such a trend in the design synthesis of its auxiliaries. Therefore, the raw material design of how to utilize the chemical recovery of the polyethylene terephthalate to obtain develops an auxiliary agent with green sources and stable molecular structures, solves the problems of rapid reduction of intrinsic viscosity, continuous deterioration of crystallization performance and the like possibly brought by mechanical recovery processing of the polyethylene terephthalate, and has important significance for the development of the mechanical recovery industry of the polyethylene terephthalate.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides synthesis and application of a green-source recycled polyethylene terephthalate auxiliary agent, which has the effect of improving the crystallization temperature of the recycled polyethylene terephthalate, and most importantly, raw material terephthalic acid can be obtained by depolymerizing the recycled polyethylene terephthalate, and the other raw material serine has a biological-based source, and the two raw materials have green properties and low cost and have important significance in the field of modification of the recycled polyethylene terephthalate.
The invention provides synthesis and application of a green-source recycled polyethylene terephthalate auxiliary agent, which is characterized by comprising the following molecular structures:
the synthesis and application of the recycled polyethylene terephthalate auxiliary agent from a green source are characterized in that the preparation method comprises the following steps:
7.9 g terephthalic acid and 10 g serine are dissolved in 200 mL of N, N-dimethylformamide solution, 0.2 g methanesulfonic acid is added, the mixture is stirred at 120 ℃ by using an electric stirrer at 800 rpm for 8 h, after the reaction is finished, 350 mL of N, N-dimethylformamide solution is used for washing the obtained solid, and the obtained solid is dried at 80 ℃ until the weight is constant, thus obtaining an intermediate product A. Placing 8.5 g intermediate A and 2 g sodium hydroxide into 200 mL deionized water, stirring at 80 ℃ with an electric stirrer at 800 rpm for 6 h, washing the obtained solid with acetone and deionized water in sequence to be neutral, and drying at 80 ℃ to constant weight to obtain the recycled polyethylene terephthalate auxiliary agent with a green source.
In addition, the invention also provides synthesis and application of the recycled polyethylene terephthalate auxiliary agent from a green source.
Preferably, as a modification, the reaction temperature of the first step of synthesizing the recycled polyethylene terephthalate auxiliary agent from the green source is 120 ℃, the reaction time is 8 h, the reaction temperature of the second step is 80 ℃, and the reaction time is 6 h.
The reaction temperature and time of the invention are determined based on the boiling point and the reactivity of the solvent, and the reaction conditions are the optimal conditions verified by the test.
Preferably, the product is washed in the step and the resulting solid is washed in the order of acetone and deionized water, and dried to constant weight at 80 ℃.
According to the invention, through verification, the unreacted impurities can be fully removed by sequentially washing with acetone and deionized water, and in addition, the drying effect of the product cannot be ensured due to the fact that the drying temperature of the product is too high or too low, and the impurity removal and drying conditions are the optimal conditions through test verification.
In addition, various reaction conditions and parameters in the synthesis and application of the environment-friendly recycled polyethylene terephthalate auxiliary agent are better conditions verified by experiments.
Preferably, the recycled polyethylene terephthalate auxiliary agent with a green source is used in an amount of 0.3% of the recycled polyethylene terephthalate.
The addition amount of the recycled polyethylene terephthalate auxiliary agent with green sources, which is synthesized by the invention, needs to be proper to better play a beneficial role, and is a better condition through experimental verification.
Compared with the prior art, the invention has the following technical effects.
1. The sodium carboxylate chain segment on the auxiliary agent molecular chain and the ester group at the tail end of the recycled polyethylene glycol terephthalate molecular chain are subjected to chemical reaction in the processing process, so that the effect of chemical nucleation is achieved. Meanwhile, the microscopic morphology of the auxiliary agent can induce the recycled polyethylene glycol terephthalate to generate parasitic crystals, so that the free energy of crystallization is sharply reduced in the crystallization process. Therefore, the auxiliary agent acts on the crystallization process of the recovered polyethylene terephthalate from two aspects of nucleation and crystal growth simultaneously, thereby greatly improving the crystallization temperature of the recovered polyethylene terephthalate.
2. The chemical reaction of the carboxylic acid sodium salt chain segment on the auxiliary agent molecular chain and the end ester group of the recycled polyethylene terephthalate molecular chain can promote the local crosslinking of the recycled polyethylene terephthalate at the same time, and the effect can greatly improve the intrinsic viscosity of the recycled polyethylene terephthalate, so that the adverse effect of the reduction of the intrinsic viscosity on the recycled polyethylene terephthalate due to the breakage of the molecular chain in the secondary processing process is avoided.
3. The raw materials of the auxiliary agent are combined through chemical bonds in the synthesis process, the chemical structure is stable, and the molecular chain segments of all components cannot be separated from the recycled polyethylene terephthalate in the melt processing process, so that the effect is weakened or eliminated.
Detailed description of the preferred embodiments
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be further described in detail with reference to the following examples, and it should be understood that the specific examples described herein are only for explaining the present invention and are not intended to limit the present invention. Unless otherwise indicated, the materials, reagents and equipment used in the present invention are conventional and commercially available in the art.
Example 1
7.9 g terephthalic acid (CAS: 100-21-0) and 10 g serine (CAS: 302-84-1) were dissolved in 200 mL of N, N-dimethylformamide solution, 0.2 g methanesulfonic acid (CAS: 75-75-2) was added, and the resultant was washed with 350 mL of N, N-dimethylformamide solution after the completion of the reaction by stirring 8 h at 120℃with an electric stirrer at 800 rpm, and dried at 80℃to constant weight to obtain intermediate A. 8.5 g intermediate A and 2 g sodium hydroxide (CAS: 1310-73-2) are placed in 200 mL deionized water, stirred at 80 ℃ by an electric stirrer at 800 rpm for 6 h, the obtained solid is washed with acetone and deionized water in sequence to be neutral, and dried to constant weight at 80 ℃ to obtain the recycled polyethylene terephthalate auxiliary agent with green sources.
Mixing the auxiliary agent and recycled polyethylene terephthalate (beverage bottle reclaimed material) in a high-speed mixer according to a mass ratio of 0.3:100 (mixing speed of 3000 rpm, mixing time of 5 min), extruding in a conventional double-screw extruder, granulating, performing injection molding on an injection molding machine to obtain a test sample, and calculating the intrinsic viscosity according to the following formula. The specific data are shown in table 1.
(wherein α=0.77, k=2.75x10) -4 ）
The crystallization temperature was determined according to the method described in GB/T19466.3-2004 standard. The specific data are shown in table 1.
Example 2
This example is essentially the same as example 1, and a sample of a blend of recycled polyethylene terephthalate (beverage bottle recovery) was prepared using a green-derived recycled polyethylene terephthalate additive of this example by the method of reference example 1, and the mass ratio of additive synthesized in this example to recycled polyethylene terephthalate was 1:100, as shown in Table 1.
Example 3
This example is essentially the same as example 1, and a sample of a blend of recycled polyethylene terephthalate (beverage bottle recovery) was prepared using a green-derived recycled polyethylene terephthalate additive of this example by the method of reference example 1, and the mass ratio of additive synthesized in this example to recycled polyethylene terephthalate was 0.1:100, as shown in Table 1.
Comparative example 1
And extruding and granulating the pure recycled polyethylene terephthalate (beverage bottle reclaimed material) in a conventional double-screw extruder, and performing injection molding on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as in example 1, the crystallization temperature was measured as described in GB/T19466.3-2004 standard, and the specific data are shown in Table 1.
Comparative example 2
The raw materials terephthalic acid and the recycled polyethylene terephthalate (beverage bottle recycled material) are mixed in a high-speed mixer according to the mass ratio of 0.3:100 (the mixing rotating speed is 3000 rpm, the mixing time is 5 min), extruded in a conventional double-screw extruder, granulated and injection molded on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as described above and the crystallization temperature was measured as described in GB/T19466.3-2004, the specific data being shown in Table 1.
Comparative example 3
Mixing raw material serine and recycled polyethylene terephthalate (beverage bottle recycled material) in a high-speed mixer according to a mass ratio of 0.3:100 (mixing speed of 3000 rpm, mixing time of 5 min), extruding in a conventional double-screw extruder, granulating, and performing injection molding on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as described above and the crystallization temperature was measured as described in GB/T19466.3-2004, the specific data being shown in Table 1.
Comparative example 4
Mixing raw material sodium hydroxide and recycled polyethylene terephthalate (beverage bottle recycled material) in a high-speed mixer according to a mass ratio of 0.3:100 (mixing speed of 3000 rpm, mixing time of 5 min), extruding in a conventional double-screw extruder, granulating, and performing injection molding on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as described above and the crystallization temperature was measured as described in GB/T19466.3-2004, the specific data being shown in Table 1.
Comparative example 5
Raw materials of 10 g serine, 7.9 g terephthalic acid and 2 g sodium hydroxide are simply mixed in a high-speed mixer (mixing rotation speed of 3000 rpm, mixing time of 5 min), mixed with recycled polyethylene terephthalate (beverage bottle reclaimed material) in the high-speed mixer according to a mass ratio of 0.3:100 (mixing rotation speed of 3000 rpm, mixing time of 5 min), extruded in a conventional double-screw extruder, granulated and injection molded on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as described above and the crystallization temperature was measured as described in GB/T19466.3-2004, the specific data being shown in Table 1.
Comparative example 6
The intermediate product A and the recycled polyethylene terephthalate (beverage bottle recycled material) are mixed in a high-speed mixer according to the mass ratio of 0.3:100 (the mixing rotating speed is 3000 rpm, the mixing time is 5 min), extruded in a conventional double-screw extruder, granulated and injection molded on an injection molding machine to obtain a test sample. The intrinsic viscosity was calculated as described above and the crystallization temperature was measured as described in GB/T19466.3-2004, the specific data being shown in Table 1.
Table 1 test results for each of examples and comparative examples
| Intrinsic viscosity (dL/g) | Crystallization temperature (. Degree. C.) | |
| Example 1 | 0.925 | 224.53 |
| Example 2 | 0.821 | 217.26 |
| Example 3 | 0.782 | 211.74 |
| Comparative example 1 | 0.526 | 189.40 |
| Comparative example 2 | 0.563 | 205.83 |
| Comparative example 3 | 0.568 | 207.31 |
| Comparative example 4 | 0.534 | 190.07 |
| Comparative example 5 | 0.577 | 207.43 |
| Comparative example 6 | 0.609 | 209.59 |
As can be seen from the experimental results in Table 1, the crystallization temperature of the recycled polyethylene terephthalate with the aid of the invention in examples 1-3 was higher than that of the comparative example. Example 1, wherein the addition amount was 0.3%, was most preferable. Compared with the pure recovered polyethylene terephthalate of the comparative example 1, the synthetic auxiliary agent of the invention has the effect of obviously improving the crystallization temperature of the recovered polyethylene terephthalate. In addition, too much or too little of the addition amount of the auxiliary agent adversely affects the intrinsic viscosity and crystallization temperature of the recycled polyethylene terephthalate.
The auxiliary agent prepared by the invention is synthesized through chemical reaction, so that all chain segments play a role at the same time, and the intrinsic viscosity and crystallization temperature of the recycled polyethylene terephthalate can be improved to the greatest extent. In contrast, comparative examples 2 to 5 were only single raw materials or simple mixtures of raw materials, and did not undergo chemical reaction, and the above effects could not be fully exerted. Among them, the terephthalic acid added in comparative example 2 and serine added in comparative example 3 can only raise the crystallization temperature of the recovered polyethylene terephthalate as heterogeneous nucleating agents, but their effects are limited. In addition, since the two raw materials have carboxyl functional groups, they can chemically react with hydroxyl groups on the molecular chain of the recycled polyethylene terephthalate during melt processing, and thus contribute slightly to the improvement of the intrinsic viscosity thereof. The sodium hydroxide added in comparative example 4 has no obvious effect on the crystallization temperature and the intrinsic viscosity of the system, so that the lifting effect of comparative example 4 is only slightly better than that of comparative example 1. Comparative example 5, in which the raw materials were simply mixed without undergoing chemical reaction, had only better lifting effect than comparative examples 2 to 4, in which the single component was added, because no beneficial functional group was generated. In contrast, the intermediate added in comparative example 6 and the intermediate in the simple mixture of sodium hydroxide can be used as a substrate for the recovery of polyethylene terephthalate with attached crystals, thereby increasing the crystallization temperature, but it lacks chemical nucleation, so that the crystallization temperature is still somewhat different from that of the respective examples. In addition, the molecular chain of the intermediate product also contains carboxyl functional groups, and the carboxyl functional groups can react with hydroxyl groups on the molecular chain of the recycled polyethylene terephthalate during melt processing, so that the molecular chain has a certain contribution to the improvement of the intrinsic viscosity of the recycled polyethylene terephthalate.
Therefore, the environment-friendly recycled polyethylene terephthalate auxiliary agent provided by the invention can play a beneficial role, so that the crystallization temperature and the intrinsic viscosity of the environment-friendly recycled polyethylene terephthalate auxiliary agent are improved, and the environment-friendly recycled polyethylene terephthalate auxiliary agent has very important practical significance for the development of the polyethylene terephthalate mechanical recycling industry.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (5)
1. The synthesis and application of the recycled polyethylene terephthalate auxiliary agent from a green source are characterized in that the molecular structure is as follows:
2. the synthesis and application of a recycled polyethylene terephthalate auxiliary agent of green origin according to claim 1, characterized in that the preparation method comprises the following steps:
7.9 g terephthalic acid and 10 g serine are dissolved in 200 mL of N, N-dimethylformamide solution, 0.2 g methanesulfonic acid is added, the mixture is stirred at 120 ℃ by using an electric stirrer at 800 rpm for 8 h, after the reaction is finished, 350 mL of N, N-dimethylformamide solution is used for washing the obtained solid, and the obtained solid is dried at 80 ℃ until the weight is constant, thus obtaining an intermediate product A. Placing 8.5 g intermediate A and 2 g sodium hydroxide into 200 mL deionized water, stirring at 80 ℃ with an electric stirrer at 800 rpm for 6 h, washing the obtained solid with acetone and deionized water in sequence to be neutral, and drying at 80 ℃ to constant weight to obtain the recycled polyethylene terephthalate auxiliary agent with a green source.
3. Use of a recycled polyethylene terephthalate auxiliary of green origin according to claim 1 or 2 in the recycling of polyethylene terephthalate.
4. Use of a recycled polyethylene terephthalate auxiliary from green sources according to claim 3, characterized in that: the dosage of the recycled polyethylene terephthalate auxiliary agent from the green source is 0.1-1% of the mass of the recycled polyethylene terephthalate.
5. Use of a recycled polyethylene terephthalate auxiliary from green sources according to claim 3, characterized in that: the dosage of the recycled polyethylene terephthalate auxiliary agent with the green source is 0.3 percent of the mass of the recycled polyethylene terephthalate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311728437.2A CN117623966A (en) | 2023-12-15 | 2023-12-15 | Synthesis and application of recycled polyethylene terephthalate auxiliary agent from green source |
| NL2037731A NL2037731A (en) | 2023-12-15 | 2024-05-21 | Synthesis and application of green-sourced adjuvant for recycling polyethylene terephthalate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311728437.2A CN117623966A (en) | 2023-12-15 | 2023-12-15 | Synthesis and application of recycled polyethylene terephthalate auxiliary agent from green source |
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| Publication Number | Publication Date |
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| CN117623966A true CN117623966A (en) | 2024-03-01 |
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| CN202311728437.2A Pending CN117623966A (en) | 2023-12-15 | 2023-12-15 | Synthesis and application of recycled polyethylene terephthalate auxiliary agent from green source |
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| Country | Link |
|---|---|
| CN (1) | CN117623966A (en) |
| NL (1) | NL2037731A (en) |
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- 2023-12-15 CN CN202311728437.2A patent/CN117623966A/en active Pending
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- 2024-05-21 NL NL2037731A patent/NL2037731A/en unknown
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| NL2037731A (en) | 2024-07-09 |
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