CN115895110B - Polypropylene composition and preparation method and application thereof - Google Patents
Polypropylene composition and preparation method and application thereof Download PDFInfo
- Publication number
- CN115895110B CN115895110B CN202211402285.2A CN202211402285A CN115895110B CN 115895110 B CN115895110 B CN 115895110B CN 202211402285 A CN202211402285 A CN 202211402285A CN 115895110 B CN115895110 B CN 115895110B
- Authority
- CN
- China
- Prior art keywords
- polypropylene
- parts
- recycled
- melt index
- polypropylene composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene composition, a preparation method and application thereof. The polypropylene composition comprises the following components in parts by weight: 60-80 parts of new polypropylene, 20-40 parts of recycled polypropylene and 1-5 parts of other auxiliary agents; the melt index stability index of the new polypropylene is 1.1-1.3; the melting point of the recycled polypropylene is 154-164 ℃; the melt index stability index of the recycled polypropylene is 1.5-3.0. The polypropylene composition can realize higher viscose performance, and meanwhile, the selected raw materials are convenient and easy to obtain, and the production process is simple and is suitable for large-scale production.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene composition, a preparation method and application thereof.
Background
Among automobile parts, polypropylene materials are widely used in various systems such as bumpers, dashboards, door panels and the like. Many of these polypropylene components require interfacial bonding by glue. On the other hand, more and more host factories are interested in recycling plastics, but how to use them in viscose is rarely reported.
Chinese patent CN114736456a discloses that the crystallinity of the material is improved by synergistic effect of specific nucleating agent and talc powder component with high aspect ratio, and the viscose property of polypropylene composition is significantly improved. In the prior art, the adhesive property of polypropylene is regulated by adding a high-viscosity auxiliary agent, and a technical means for optimizing, screening and improving the adhesive property of polypropylene for the polypropylene material is lacked. According to the invention, through specific screening of the polypropylene material, the viscose performance of polypropylene is obviously improved, and a new simple preparation scheme is provided for the high-viscose polypropylene material.
Disclosure of Invention
The invention aims to provide a polypropylene composition, and a preparation method and application thereof. The polypropylene composition can realize higher adhesive property.
In order to achieve the above purpose, the present invention adopts the following technical scheme: the polypropylene composition comprises the following components in parts by weight: 60-80 parts of new polypropylene, 20-40 parts of recycled polypropylene and 1-5 parts of other auxiliary agents;
the melt index stability index of the new polypropylene is 1.1-1.3;
the melting point of the recycled polypropylene is 154-164 ℃; the melt index stability index of the recycled polypropylene is 1.5-3.0.
More preferably, the polypropylene composition comprises the following components in parts by weight: 70-75 parts of new polypropylene, 25-30 parts of recycled polypropylene and 2-3 parts of other auxiliary agents.
Preferably, the melting point of the recycled polypropylene is 160-164 ℃.
Preferably, the melt index stability of the recycled polypropylene is 2.0 to 2.5.
Preferably, the other auxiliary agents include common auxiliary agents in the art such as toner (e.g., carbon black, etc.), antioxidants (e.g., antioxidant 1010, antioxidant 168, etc.).
A method for preparing the polypropylene composition, comprising the steps of:
all the components are mixed according to the proportion and are subjected to melt blending and extrusion to prepare the polypropylene composition.
Preferably, the extrusion temperature is 190-230 ℃.
Use of the polypropylene composition for the preparation of automotive and household parts including bumpers, fascia, door panels and the like.
In the invention, the recovered polypropylene is oxidized to different degrees after long-time use, and a plurality of functional groups which damage the polypropylene crystals are grown on the molecular chains, so that the thickness of the polypropylene crystal wafer is reduced, the melting point is reduced compared with that of the new polypropylene, however, the crystals of the recovered polypropylene material are partially damaged, and a larger free volume can be formed in the system, thereby promoting the penetration of glue components and further improving the adhesive strength of the polypropylene material. Meanwhile, the shearing strength of the adhesive is very dependent on flame treatment, because the flame treatment can enable a great amount of polar functional groups on the surface of the polypropylene material to react with the adhesive component, thereby improving the shearing strength of the adhesive. The flame treatment can treat the surface layer of the polypropylene material, but the treatment depth is limited, so that the improvement of the adhesive strength is limited, and the recycled polypropylene generates polar functional groups with different degrees after long-time aging, and the functional groups can provide additional reaction sites for the polypropylene and the adhesive component on the subsurface which is not achieved by the flame treatment, further promote the adhesive component to react with the polypropylene, and finally improve the adhesive strength. The melt index reflects the stability of polypropylene in the processing process, and proper melt index of polypropylene can ensure that the polypropylene is slightly degraded in the processing process, so that a larger free volume in the system can be maintained, the infiltration of glue components in the subsequent gluing process is facilitated, and the gluing strength of the polypropylene is provided.
Compared with the prior art, the invention has the following beneficial effects:
1) The invention strengthens the penetration of glue in the process of glue by utilizing the free volume generated in the oxidative degradation process of the recycled polypropylene, and simultaneously provides an additional reaction site for the glue on the subsurface layer of the polypropylene material by utilizing a proper amount of polar groups on the recycled polypropylene.
2) The invention utilizes proper instability of the recycled polypropylene in the processing process, and continuously ensures the free volume of the recycled polypropylene.
3) The invention is used for recycling polypropylene in a large amount, and fully embodies enterprise responsibility under policy.
4) The raw materials are convenient and easy to obtain, and the production process is simple and is suitable for large-scale production.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the examples and comparative examples, the experimental methods used were conventional methods, and the materials, reagents and the like used were commercially available, unless otherwise specified.
The invention selects the recycled polypropylene material to prepare the material through the steps of recycling, crushing, cleaning, secondary crushing, granulating by an extruder, mixing and homogenizing by a color mixing tank, and the obtained material has good uniformity and stability.
The method for measuring the melting point of the recycled polypropylene comprises the following steps: and (3) testing by adopting a differential scanning calorimeter, weighing 5-10mg of samples, heating from 30 ℃ to 200 ℃ at a heating rate of 20 ℃/min, keeping the temperature for 3min, cooling to 30 ℃ at a temperature of 10 ℃/min, keeping the temperature for 3min, heating to 200 ℃ at a heating rate of 10 ℃/min, and taking the temperature corresponding to the endothermic peak of the second heating curve as the melting point of the recycled polypropylene.
The method for measuring the melt index stability index of the recycled polypropylene comprises the following steps: passing the recycled polypropylene material through a twin screw extruder at 210 ℃ in sequence1-3 times of machine, and the melt index (test condition: 230 ℃ C., 2.16 kg) of the machine passing 1 time is R 1 The melt index of 3 times of passing machine is R 3 ，R 3 /R 1 The melt index is the melt index R.
The raw materials used in the examples and comparative examples are described in Table 1.
TABLE 1
Examples 1 to 15 and comparative examples 1 to 10
The polypropylene compositions of examples 1 to 15 and comparative examples 1 to 10 are shown in tables 2 and 3 as components, parts by weight and performance parameters.
The preparation method of the polypropylene compositions of examples 1 to 15 and comparative examples 1 to 10 comprises the following steps:
all the components are mixed according to the proportion, and are subjected to melt blending and extrusion at 220 ℃ to prepare the polypropylene composition.
Table 2 the amounts (parts by weight) of the components in the examples
Table 3 amounts of the components (parts by weight) in the comparative examples
Performance testing
And (3) testing the shearing strength of the adhesive: the test was performed with reference to EQCT-851 standard.
Preparation of the sample: 150mm x 25 mm x 2mm of PP-LGF40 experimental plate, 150mm x 25 x 2mm of polypropylene composition experimental plates prepared in examples 1-15 and comparative examples 1-10, wiping the surface of the experimental plate with isopropyl alcohol with concentration of 75%, sun-drying, and then carrying out surface treatment by flame, wherein the flame temperature is controlled at 1000-1500 ℃, and the flame outer flame distance is 8-12 cm from the surface of the experimental plate. Then the PP-LGF40 and the polypropylene composition experimental board after surface treatment are glued by polyurethane glue, the lap joint length is 10+/-2 mm, the glue layer thickness is about 2mm, then the glued experimental board is put in a constant temperature and humidity (23+/-2 ℃ and 50+/-5% RH) laboratory for curing for 72 hours, then a tensile test is carried out at a speed of 20mm/min, and the shearing strength of the glue and the MPa are calculated according to the lap joint area. The experimental results are shown in table 4.
Table 4 viscose shear strength data for each sample
From the data in Table 4, it can be seen that the polypropylene composition prepared in the examples of the present invention can achieve higher adhesive shear strength, wherein the polypropylene composition can achieve an adhesive shear strength of 3.08 to 3.98MPa.
As can be seen from the data of comparative examples 1 to 4 and examples, when only a single virgin polypropylene or recycled polypropylene is selected, the parts by weight of the virgin polypropylene and the recycled polypropylene added are unsuitable, the resulting polypropylene composition has poor adhesive shear strength. Without adding recycled polypropylene material, the free space for glue penetration and the sites for glue reaction which are enough for the recycled polypropylene cannot be provided; even if the recycled polypropylene material is used in an excessively high weight part, stress defects can be formed in the viscose process due to the fact that the recycled polypropylene material contains a few relatively low-molecular compounds, and the high viscose shearing strength is not good for obtaining.
The recycled polypropylene added in comparative examples 5 to 6 has an unsuitable melting point, and the prepared polypropylene composition has a poor adhesive shear strength, and the adhesive shear strength is lower than 2.5MPa. The oxidative degradation of the recycled polypropylene with an excessively low melting point is excessively severe, stress defects can be formed in the viscose process, the high viscose shearing strength is not easily obtained, the aging degradation of the recycled polypropylene with an excessively high melting point is excessively slight, and enough free space for the viscose to infiltrate and the sites for the viscose reaction generated by the recycled material cannot be provided.
The recovered polypropylene added in comparative examples 7 to 8 was unsuitable in melt index stability, and the prepared polypropylene compositions had poor adhesive shear strength, and the adhesive shear strength was less than 2.5MPa. An excessively low melt index means that the recycled polypropylene cannot maintain its free volume available for glue penetration by a sustained slight process degradation, while an excessively high melt index means that the process degradation of the recycled polypropylene is uncontrollable, which can result in a large amount of low molecular substances forming interface defects in the glue process, ultimately resulting in lower glue shear strength of the polypropylene composition.
The melt index stability index of the new polypropylene material added in comparative example 9 was not suitable, and the produced polypropylene composition had poor adhesive shear strength.
In comparative example 10, a new polypropylene material having a melting point close to that of the recycled polypropylene was selected for processing, and the resulting polypropylene composition had a lower adhesive shear strength than in the examples. The low-melting-point new polypropylene lacks sufficient molecular breaking capacity, can not ensure that the low-melting-point new polypropylene always has sufficient free volume in the process of processing the low-melting-point new polypropylene into a finished product, and also lacks sufficient polar groups because the low-melting-point new polypropylene does not undergo a long-term aging process, and the factors all cause that the low-melting-point new polypropylene can not provide good adhesive shearing strength for the prepared material.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (8)
1. The polypropylene composition is characterized by comprising the following components in parts by weight: 60-80 parts of new polypropylene, 20-40 parts of recycled polypropylene and 1-5 parts of other auxiliary agents;
the melt index stability index of the new polypropylene is 1.1-1.3;
the melting point of the recycled polypropylene is 154-164 ℃; the melt index stability index of the recycled polypropylene is 1.5-3.0;
the method for measuring the melt index stability index comprises the following steps: sequentially passing the polypropylene material through a double-screw extruder for 1-3 times, wherein the melt index of the polypropylene material passing through the extruder for 1 time is R 1 The melt index of 3 times of passing machine is R 3 ，R 3 /R 1 Namely, the melt index R, wherein the test condition of the melt index is at 230 ℃ and 2.16 kg.
2. The polypropylene composition according to claim 1, comprising the following components in parts by weight: 70-75 parts of new polypropylene, 25-30 parts of recycled polypropylene and 2-3 parts of other auxiliary agents.
3. The polypropylene composition according to claim 1, wherein the recycled polypropylene has a melting point of 160 to 164 ℃.
4. The polypropylene composition according to claim 1, wherein the recovered polypropylene has a melt index stability of 2.0 to 2.5.
5. The polypropylene composition according to claim 1, wherein the other additives include a toner, an antioxidant.
6. A method for preparing the polypropylene composition according to any one of claims 1 to 5, comprising the steps of:
all the components are mixed according to the proportion and are subjected to melt blending and extrusion to prepare the polypropylene composition.
7. The method of claim 6, wherein the extrusion temperature is 190-230 ℃.
8. Use of the polypropylene composition according to any one of claims 1 to 5 for the preparation of automotive and household parts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211402285.2A CN115895110B (en) | 2022-11-09 | 2022-11-09 | Polypropylene composition and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211402285.2A CN115895110B (en) | 2022-11-09 | 2022-11-09 | Polypropylene composition and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115895110A CN115895110A (en) | 2023-04-04 |
| CN115895110B true CN115895110B (en) | 2023-09-12 |
Family
ID=86473779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211402285.2A Active CN115895110B (en) | 2022-11-09 | 2022-11-09 | Polypropylene composition and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115895110B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638493A (en) * | 2009-08-27 | 2010-02-03 | 惠东美化塑胶实业有限公司 | Long glass fiber reinforced recycled polypropylene material and preparation method thereof |
| KR20170070732A (en) * | 2015-12-14 | 2017-06-22 | 현대자동차주식회사 | A long fiber reinforced polypropylene resin composition |
| CN114736456A (en) * | 2022-03-24 | 2022-07-12 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
| CN114752150A (en) * | 2022-03-22 | 2022-07-15 | 金发科技股份有限公司 | High-rigidity light-weight polypropylene composite material and preparation method and application thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220325051A1 (en) * | 2019-06-28 | 2022-10-13 | Dow Global Technologies Llc | Coupled Post-Consumer Recycled Polypropylene and Process to Provide Same |
-
2022
- 2022-11-09 CN CN202211402285.2A patent/CN115895110B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101638493A (en) * | 2009-08-27 | 2010-02-03 | 惠东美化塑胶实业有限公司 | Long glass fiber reinforced recycled polypropylene material and preparation method thereof |
| KR20170070732A (en) * | 2015-12-14 | 2017-06-22 | 현대자동차주식회사 | A long fiber reinforced polypropylene resin composition |
| CN114752150A (en) * | 2022-03-22 | 2022-07-15 | 金发科技股份有限公司 | High-rigidity light-weight polypropylene composite material and preparation method and application thereof |
| CN114736456A (en) * | 2022-03-24 | 2022-07-12 | 金发科技股份有限公司 | Polypropylene composition and preparation method and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 回收聚丙烯高熔指化的研究进展;曾尤东，贾润礼;塑料科技;第40卷(第6期);91-95 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115895110A (en) | 2023-04-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100567399C (en) | A kind of rubber powder modified asphalt and working method thereof | |
| Salama et al. | Reinforcement of polypropylene composites based on recycled wool or cotton powders | |
| CN102504471B (en) | ABS (acrylonitrile-butadiene-styrene)/fiberglass composite material and preparation method thereof | |
| CN108774307B (en) | Halogen-free flame-retardant polylactic acid wood-plastic composite material and preparation method thereof | |
| US4381357A (en) | Covering, a process of producing it and the use thereof | |
| CN103709770A (en) | Polyethylene/rubber powder blend modified asphalt and preparation method thereof | |
| CN102993757A (en) | Preparation method of stable composite modified asphalt | |
| CN102260386B (en) | Ecological composite material and preparation method thereof | |
| CN115895110B (en) | Polypropylene composition and preparation method and application thereof | |
| CN102964525A (en) | Road asphalt mixture rut resisting additive and preparation method thereof | |
| KR101755892B1 (en) | Method for manufacturing bioplastic composite using wood flour and bioplastic composite produced by using the same | |
| CN108384208B (en) | PET-based wood-plastic composite material and preparation method thereof | |
| RU2748791C1 (en) | Modifier of asphalt-concrete mixture and method for its preparation | |
| CN107501718B (en) | Reinforced modified polypropylene reclaimed material and preparation method thereof | |
| CN112708209A (en) | Lightweight high-strength glass fiber reinforced polypropylene composite material and preparation method thereof | |
| CN102532661B (en) | Natural fiber filled polyethylene composite material and preparation method thereof | |
| KR101583763B1 (en) | Modified asphalt composition | |
| CN106084492A (en) | A kind of automotive trim panel material and preparation method thereof | |
| CN111087697A (en) | Long glass fiber reinforced polypropylene composite material with good adhesive property and preparation method thereof | |
| CN114773811A (en) | Color master batch taking polylactic acid recovered waste material as carrier and preparation method thereof | |
| KR101567196B1 (en) | Composites of polypropylene and polylactic acid having high impact strength and heat resistance | |
| CN1281678C (en) | Asphalt modified masterbatch and method for preparation | |
| CN113087987A (en) | Modified rice hull powder/polyethylene wood-plastic composite material and preparation method thereof | |
| CN108264738B (en) | Master batch of solar back panel film for adding high-recovery material and preparation method thereof | |
| RU2220993C2 (en) | Modifier for improving performance of pavement bitumen blends |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |