CN117623955A - Preparation method and application of recycled polypropylene stiffening modifier - Google Patents
Preparation method and application of recycled polypropylene stiffening modifier Download PDFInfo
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- CN117623955A CN117623955A CN202311728479.6A CN202311728479A CN117623955A CN 117623955 A CN117623955 A CN 117623955A CN 202311728479 A CN202311728479 A CN 202311728479A CN 117623955 A CN117623955 A CN 117623955A
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- recycled polypropylene
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- -1 polypropylene Polymers 0.000 title claims abstract description 106
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 103
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 103
- 239000003607 modifier Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title abstract description 6
- HYNQTSZBTIOFKH-UHFFFAOYSA-N 2-Amino-5-hydroxybenzoic acid Chemical compound NC1=CC=C(O)C=C1C(O)=O HYNQTSZBTIOFKH-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000013067 intermediate product Substances 0.000 claims abstract description 21
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 13
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 10
- QSAWQNUELGIYBC-UHFFFAOYSA-N cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)C1CCCCC1C(O)=O QSAWQNUELGIYBC-UHFFFAOYSA-N 0.000 claims abstract description 10
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008117 stearic acid Substances 0.000 claims abstract description 10
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 23
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 18
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000008096 xylene Substances 0.000 claims description 6
- 238000004821 distillation Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000004064 recycling Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract 3
- 239000003960 organic solvent Substances 0.000 abstract 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 238000002156 mixing Methods 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 36
- 238000001746 injection moulding Methods 0.000 description 20
- 238000002425 crystallisation Methods 0.000 description 15
- 230000008025 crystallization Effects 0.000 description 15
- 239000000463 material Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000013078 crystal Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002667 nucleating agent Substances 0.000 description 2
- 230000008707 rearrangement Effects 0.000 description 2
- 150000003738 xylenes Chemical class 0.000 description 2
- QSAWQNUELGIYBC-OLQVQODUSA-N (1s,2r)-cyclohexane-1,2-dicarboxylic acid Chemical compound OC(=O)[C@H]1CCCC[C@H]1C(O)=O QSAWQNUELGIYBC-OLQVQODUSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000008430 aromatic amides Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Classifications
-
- 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
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C221/00—Preparation of compounds containing amino groups and doubly-bound oxygen atoms bound to the same carbon skeleton
-
- 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)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a preparation method and application of a recycled polypropylene stiffening modifier, which are prepared by the following processes: 2-amino-5-hydroxybenzoic acid and hexahydrophthalic acid are placed in an organic solvent to react at the temperature of 130 ℃ for 8 h to obtain an intermediate product A, and then the intermediate product A is reacted with potassium hydroxide in water at the temperature of 25 ℃ for 8 h to obtain an intermediate product B. And under the condition of 130 ℃, the intermediate product B and stearic acid are placed in an organic solvent to react under the catalysis of dimethyl sulfoxide to obtain the recycled polypropylene stiffening modifier, and the recycled polypropylene added with the recycled polypropylene stiffening modifier prepared by the method has excellent rigidity, and can widen the application range for recycling the recycled polypropylene, so that the recycling rate of the recycled polypropylene is greatly improved.
Description
Technical Field
The invention relates to a preparation method and application of a recycled polypropylene stiffening modifier, and belongs to the technical field of high polymer materials.
Background
The polypropylene is easily affected by factors such as light, heat, oxygen, external force and the like in the use process, and the molecular structure of the polypropylene is changed, so that the rigidity of the polypropylene is obviously deteriorated, and the difficulty is increased for recycling. Therefore, increasing the rigidity of the recycled polypropylene is an important part of the high-value utilization of the recycled polypropylene. At present, the modified recycled polypropylene is mainly prepared by adding filler, cross-linking agent and the like to improve the performance of the recycled polypropylene, wherein the cyclic carboxylic acid sodium salt can improve the supporting capacity of a molecular chain and form a more ordered crystal structure by increasing the connection point between the molecular chains of the recycled polypropylene, so that the rigidity of the recycled polypropylene is improved, but the recycled polypropylene is a small molecular substance, has poor compatibility with the recycled polypropylene, and limits the application of the recycled polypropylene.
Therefore, there is a need to develop a recycled polypropylene stiffening modifier which has good compatibility and which improves the stiffness of the recycled polypropylene by changing the crystal structure of the recycled polypropylene.
Disclosure of Invention
The invention provides a synthesis method and application of a recycled polypropylene stiffening modifier, which realize the increase of the rigidity of the recycled polypropylene and further promote the high-value utilization of the recycled polypropylene.
In order to achieve the above purpose, the molecular structure of the recycled polypropylene stiffening modifier provided by the invention is as follows:
the preparation method of the recycled polypropylene stiffening modifier comprises the following steps:
s1, adding 25.83 g of 2-amino-5-hydroxybenzoic acid and 8.61 g hexahydrophthalic acid into 200 mL dimethylbenzene, heating to a system temperature of 130 ℃ in a constant-temperature oil bath, stirring for reaction of 8 h, removing dimethylbenzene by reduced pressure distillation after the reaction is finished, washing the obtained solid by using acetone, and drying at 80 ℃ to constant weight to obtain an intermediate product A;
s2, weighing 22.12 and g intermediate A, putting the intermediate A into 200 mL water, and adding 4 g sodium hydroxide into the system. Stirring at 25 ℃ for reaction 8 h, washing the obtained solid by using acetone after the reaction is finished, and drying at 80 ℃ until the weight is constant to obtain an intermediate product B;
s3, weighing the intermediate product B of 14.6 and g, putting the intermediate product B into 200 mL dimethylbenzene, and stirring for 30 min at 130 ℃; 17.1 g stearic acid and 5 mL dimethyl sulfoxide are added into the system, the mixture is stirred at 130 ℃ and 800 rpm for 8 h, xylene is removed by reduced pressure distillation after the reaction is finished, the obtained solid is washed by acetone, and the obtained solid is dried to constant weight at 80 ℃ to obtain the recycled polypropylene stiffening modifier.
Preferably, as a modification, the raw materials 2-amino-5-hydroxybenzoic acid and hexahydrophthalic acid are used in the step S1 in a mass ratio of 3:1. The reaction time in the steps S1-S3 is 8 h, the reaction temperature in the steps S1 and S3 is 130 ℃, and the reaction temperature in the step S2 is 25 ℃.
The invention ensures that the reaction temperature and time are determined based on the boiling point, the reactivity and the production cost of the solvent, and the reaction conditions are the optimal conditions verified by the test.
In addition, various reaction conditions and parameters in the preparation method of the recycled polypropylene stiffening modifier are optimal conditions verified by tests.
The invention also provides application of the recycled polypropylene stiffening modifier, wherein the addition amount of the stiffening modifier is 0.1-1% of the mass of the recycled polypropylene.
Preferably, the addition amount of the recycled polypropylene stiffening modifier is 0.5% of the mass of the recycled polypropylene.
The addition amount of the stiffening modifier for the recycled polypropylene synthesized by the invention is proper, so that the rigidity of the recycled polypropylene can be better improved, and the addition amount is a better condition verified by a test.
Compared with the prior art, the invention has the following technical effects.
1. The cyclic carboxylate in the molecular chain of the recycled polypropylene stiffening modifier can be used as a nucleating agent of the recycled polypropylene, and the crystal structure of the recycled polypropylene is improved to promote the conversion of the macroreticular crystal orientation microcrystal thereof, so that the rigidity of the recycled polypropylene is improved.
2. Two kinds of cyclic carboxylate are combined, and the carboxylic acid group on hexahydrophthalic acid and the aromatic amide group on 2-amino-5-hydroxy benzoic acid are connected in chemical bond form to form conjugated system, so as to raise the stability of molecular structure.
3. The introduction of the stearic acid chain segment plays a role in lubrication, on the other hand, the polarity of the whole molecular structure is obviously reduced, so that the stearic acid chain segment has excellent compatibility with the recycled polypropylene, can be uniformly dispersed in a recycled polypropylene matrix, further accelerates the movement of the recycled polypropylene molecular chain, promotes the molecular chain rearrangement, further improves the crystallization capacity of the recycled polypropylene, and improves the rigidity of the recycled polypropylene.
4.2-amino-5-hydroxybenzoic acid, hexahydrophthalic acid, sodium hydroxide and stearic acid are combined through chemical bonds to obtain a novel chemical structure of the recycled polypropylene stiffening modifier, the chemical structure of the recycled polypropylene stiffening modifier is stable, and chain segments of four components cannot be separated and cannot be decomposed in the processing process.
Detailed Description
Example 1
25.83 g of 2-amino-5-hydroxybenzoic acid (CAS: 394-31-0) and 8.61 g hexahydrophthalic acid (CAS: 610-09-3) were added to 200 mL xylenes, heated to a system temperature of 130℃in a constant temperature oil bath, stirred 8 h, distilled under reduced pressure to remove xylenes after completion of the reaction, and the resulting solid was washed with acetone and dried to constant weight at 80℃to give intermediate A. 22.12. 22.12 g intermediate A was weighed into 200 mL water and 4 g sodium hydroxide (CAS: 1310-73-2) was added to the system. The reaction 8 is stirred at 25 ℃ for h, after the reaction is finished, the obtained solid is washed by acetone, and the obtained solid is dried to constant weight at 80 ℃ to obtain the reclaimed polypropylene intermediate product B. Weighing 14.6. 14.6 g intermediate B, placing into 200 mL xylene, and stirring at 130 ℃ for 30 min; 17.1 g stearic acid (CAS: 57-11-4) and 5 mL dimethyl sulfoxide (CAS: 67-68-5) are added into the system, the mixture is stirred at 130 ℃ and 800 rpm for 8 h, xylene is removed by reduced pressure distillation after the reaction is finished, the obtained solid is washed by acetone, and the recovered polypropylene stiffening modifier is obtained by drying the solid at 80 ℃ to constant weight.
The recycled polypropylene (recycled material of the electrical appliance shell) and the recycled polypropylene stiffening modifier are mixed according to the mass ratio of 100:0.5 after conventional mixing in a high-speed mixer (mixing speed 3000 rpm, mixing time 5 min), extrusion in a conventional twin-screw extruder, pelletization, and injection molding in an injection molding machine to obtain test samples. The crystallization temperature of the samples was determined according to the method described in GB/T19466.3-2004 and the flexural strength of the samples was determined according to the method described in GB/T9341-2008. The specific data are shown in table 1.
Example 2
This example is essentially the same as example 1, and a polypropylene blend sample was prepared and recovered using the recovered polypropylene stiffening modifier of this example by the method of example 1, and the mass ratio of the recovered polypropylene (electrical housing regrind) to the recovered polypropylene stiffening modifier synthesized in this example was 100:0.1, and the test data are shown in Table 1.
Example 3
This example is essentially the same as example 1, and a polypropylene blend sample was prepared and recovered using the recovered polypropylene stiffening modifier of this example by the method of example 1, and the mass ratio of the recovered polypropylene (electrical housing regrind) to the recovered polypropylene stiffening modifier synthesized in this example was 100:1, and the test data are shown in Table 1.
Comparative example 1
And extruding and granulating the pure recycled polypropylene (recycled material of the electrical appliance shell) in a conventional double-screw extruder, and performing injection molding on an injection molding machine to obtain a test sample. The crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 2
And (3) conventionally mixing the recycled polypropylene (the electrical equipment shell recycled material) and the 2-amino-5-hydroxybenzoic acid in a high-speed mixer according to the mass ratio of 100:0.5 (the mixing rotating speed is 3000 rpm, the mixing time is 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 3
And (3) conventionally mixing the recycled polypropylene (the recycled material of the electrical appliance shell) and hexahydrophthalic acid in a high-speed mixer according to a mass ratio of 100:0.5 (mixing rotation 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 4
And (3) conventionally mixing the recycled polypropylene (the recycled material of the electrical appliance shell) and sodium hydroxide in a high-speed mixer according to a mass ratio of 100:0.5 (mixing rotation 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 5
And (3) conventionally mixing the recycled polypropylene (the recycled material of the electrical appliance shell) and stearic acid in a high-speed mixer according to a mass ratio of 100:0.5 (mixing rotation 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 6
And (3) conventionally mixing the recycled polypropylene (the recycled material of the electrical appliance shell) and the intermediate product A in a high-speed mixer according to the mass ratio of 100:0.5 (the mixing rotating speed is 3000 rpm, the mixing time is 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 7
And (3) conventionally mixing the recycled polypropylene (the electrical equipment shell recycled material) and the intermediate product B in a high-speed mixer according to the mass ratio of 100:0.5 (the mixing rotating speed is 3000 rpm, the mixing time is 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 crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 8
The intermediate product A of 22.12 and g is simply mixed with sodium hydroxide of 4 g in a high-speed mixer (mixing speed of 3000 rpm, mixing time of 5 min), and is subjected to conventional mixing with recycled polypropylene (electrical appliance shell reclaimed material) in the high-speed mixer according to the mass ratio of 0.3:100 (mixing speed of 3000 rpm, mixing time of 5 min), extruded in a conventional twin-screw extruder, granulated and injection molded on an injection molding machine to obtain a test sample. The crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 9
The intermediate product B of 14.6 and g is simply mixed with stearic acid of 17.1 and g in a high-speed mixer (mixing rotation speed of 3000 rpm, mixing time of 5 min), and is subjected to conventional mixing with recycled polypropylene (electrical appliance shell recycled material) in the high-speed mixer according to the mass ratio of 0.3:100 (mixing rotation speed of 3000 rpm, mixing time of 5 min), extruded in a conventional twin-screw extruder, granulated and injection molded on an injection molding machine to obtain a test sample. The crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Comparative example 10
The test sample was obtained by simply mixing 25.83 g of 2-amino-5-hydroxybenzoic acid, 8.61 g of g hexahydrophthalic acid, 4. 4 g of sodium hydroxide and 17.1 g of g stearic acid in a high-speed mixer (mixing speed: 3000 rpm, mixing time: 5 minutes), and after conventional mixing with recycled polypropylene (electrical equipment housing regrind) in a mass ratio of 0.3:100 in a high-speed mixer (mixing speed: 3000 rpm, mixing time: 5 minutes), extruding in a conventional twin-screw extruder, granulating, and injection molding in an injection molding machine. The crystallization temperature and flexural strength were obtained as described above, and the specific data are shown in Table 1.
Table 1 test results for each of examples and comparative examples
| Crystallization temperature (. Degree. C.) | Flexural Strength (MPa) | |
| Example 1 | 135.4 | 39.9 |
| Example 2 | 134.3 | 39.1 |
| Example 3 | 134.6 | 39.3 |
| Comparative example 1 | 116.1 | 30.4 |
| Comparative example 2 | 120.4 | 32.3 |
| Comparative example 3 | 120.6 | 32.4 |
| Comparative example 4 | 116.3 | 30.5 |
| Comparative example 5 | 120.9 | 32.3 |
| Comparative example 6 | 125.4 | 34.3 |
| Comparative example 7 | 128.8 | 35.9 |
| Comparative example 8 | 125.6 | 34.5 |
| Comparative example 9 | 130.7 | 37.3 |
| Comparative example 10 | 128.7 | 35.4 |
From the experimental results in Table 1, it is understood that the crystallization temperature and the flexural strength of the recycled polypropylene stiffening modifier prepared in examples 1-3 were relatively high. Example 1, wherein the addition amount was 0.5%, was most preferable. Compared with the pure recycled polypropylene of the comparative example 1, the recycled polypropylene stiffening modifier synthesized by the invention has the effect of obviously improving the crystallization temperature and the bending strength of the recycled polypropylene. In addition, too much or too little addition of the auxiliary agent may improve the performance of the recycled polypropylene but may not exert the optimal effect.
The recycled polypropylene stiffening modifier prepared by the invention is synthesized through chemical reaction, so that each chain segment can play a role at the same time, and the effect of greatly improving the rigidity of the recycled polypropylene is achieved by improving the crystal structure of the recycled polypropylene and promoting the molecular chain rearrangement of the recycled polypropylene. In contrast, comparative examples 2 to 10 were added with only a single raw material, intermediate product or simple mixture of raw materials, did not undergo complete chemical reaction, and the synergistic effect was not exhibited. Among them, 2-amino-5-hydroxybenzoic acid added in comparative example 2 and hexahydrophthalic acid added in comparative example 3 as heterogeneous nucleating agents can arrange the crystal structures of recycled polypropylene in order to improve the rigidity thereof, but have limited effect. The sodium hydroxide added in comparative example 4 is strong alkali, but has weak effect, while the stearic acid added in comparative example 5 has good dispersibility and stronger effect than 2, 3 and 4. The intermediate product a added in comparative example 6 plays a role in improving the performance of the recovered polypropylene and is superior to comparative examples 2 and 3. The properties of the recycled polypropylene in comparative example 7 were greatly improved, but the improvement effect was only better than that of comparative examples 2 to 6, in which a single component was added, because the dispersibility of the intermediate product B in the recycled polypropylene matrix was not improved. The intermediate product a added in comparative example 8 had only a minor improvement over comparative example 6 in that it did not undergo a complete chemical reaction with sodium hydroxide to effect heterogeneous nucleation in the polypropylene matrix. Comparative example 9 and comparative example 10, although not completely chemically reacted, the presence of stearic acid greatly improved the dispersibility in the recycled polypropylene and improved the properties of the recycled polypropylene to some extent, and comparative example 9, although the most preferred example, was a certain difference from example 1. Therefore, the synthesized recycled polypropylene stiffening modifier has important significance for improving the rigidity of the recycled polypropylene and also has important significance for developing a new field of recycling the recycled polypropylene.
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 recycled polypropylene stiffening modifier is characterized by comprising the following molecular structure:
2. the recycled polypropylene stiffening modifier of claim 1, wherein the recycled polypropylene stiffening modifier is prepared by the following method:
s1, adding 25.83 g of 2-amino-5-hydroxybenzoic acid and 8.61 g hexahydrophthalic acid into 200 mL dimethylbenzene, heating to a system temperature of 130 ℃ in a constant-temperature oil bath, stirring for reaction of 8 h, removing dimethylbenzene by reduced pressure distillation after the reaction is finished, washing the obtained solid by using acetone, and drying at 80 ℃ to constant weight to obtain an intermediate product A;
s2, weighing 22.12 and g intermediate A, putting the intermediate A into 200 mL water, and adding 4 g sodium hydroxide into the system. Stirring at 25 ℃ for reaction 8 h, washing the obtained solid by using acetone after the reaction is finished, and drying at 80 ℃ until the weight is constant to obtain an intermediate product B;
s3, weighing the intermediate product B of 14.6 and g, putting the intermediate product B into 200 mL dimethylbenzene, and stirring for 30 min at 130 ℃; 17.1 g stearic acid and 5 mL dimethyl sulfoxide are added into the system, the mixture is stirred at 130 ℃ and 800 rpm for 8 h, xylene is removed by reduced pressure distillation after the reaction is finished, the obtained solid is washed by acetone, and the obtained solid is dried to constant weight at 80 ℃ to obtain the recycled polypropylene stiffening modifier.
3. Use of a recycled polypropylene stiffening modifier according to claim 1 or 2 in recycled polypropylene.
4. The use of a recycled polypropylene stiffening modifier according to claim 3, in recycled polypropylene, wherein: the dosage of the recycled polypropylene stiffening modifier is 0.1-1% of the mass of the recycled polypropylene.
5. The use of a recycled polypropylene stiffening modifier according to claim 3, in recycled polypropylene, wherein: the dosage of the recycled polypropylene stiffening modifier is 0.5 percent of the mass of the recycled polypropylene.
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| CN202311728479.6A CN117623955A (en) | 2023-12-15 | 2023-12-15 | Preparation method and application of recycled polypropylene stiffening modifier |
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