CN115260654A - High-performance polyolefin composition with excellent dimensional stability and preparation method thereof - Google Patents
High-performance polyolefin composition with excellent dimensional stability and preparation method thereof Download PDFInfo
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- CN115260654A CN115260654A CN202210984587.9A CN202210984587A CN115260654A CN 115260654 A CN115260654 A CN 115260654A CN 202210984587 A CN202210984587 A CN 202210984587A CN 115260654 A CN115260654 A CN 115260654A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
Abstract
The invention discloses a high-performance polyolefin composition with excellent dimensional stability and a corresponding preparation method, and the high-performance polyolefin composition mainly comprises the following components in parts by weight: 40-70 parts of PP resin, 10-20 parts of COC resin, 5-15 parts of LLDPE, 2-10 parts of toughening agent, 5-15 parts of filler, 0.1-0.6 part of light stabilizer and 0.5-1.5 parts of other auxiliary agents, and the high-performance polyolefin composition can be obtained by mixing, extruding and granulating the components. The polyolefin composition provided by the invention not only has excellent dimensional stability, but also has excellent mechanical properties, and is suitable for being applied to automobile interior and exterior parts.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a high-performance polyolefin composition with excellent dimensional stability and a preparation method thereof.
Background
Polypropylene resin (PP) is a general plastic which has excellent comprehensive properties such as mechanical property, chemical corrosion resistance, high heat resistance, easy processing, low toxicity, low cost and the like and is widely applied, and the PP is widely applied in the fields of daily necessities, films, pipes, electric tools, electronics and electrics, automobiles, small household appliances, medical appliances and the like, and is particularly used as a material suitable for automobile interior and exterior trimming parts.
Because the PP resin belongs to a crystalline material, the crystallinity is high, the shrinkage rate is large, so that shrinkage marks and depressions are easy to generate when thick products are injected, and the appearance of the products is seriously influenced. And because the transverse and longitudinal molding shrinkage rate is large, especially the glass fiber reinforced and modified PP material is easy to warp, the problem of product warpage is easily caused, and great difficulty is brought to the design of products and molds.
At present, talcum powder, mica and glass beads are usually added to improve the size stability of PP, but the problems of poor mechanical property and poor appearance are also brought.
Therefore, a PP-modified material having excellent dimensional stability and excellent mechanical properties is very necessary.
Disclosure of Invention
Aiming at the technical defect of poor dimensional stability of the existing PP resin, the amorphous COC resin is adopted for improvement, and LLDPE is adopted as a compatilizer, so that the optimization of the dimensional stability of the PP resin can be realized by adding a small amount of mineral filler, and the PP resin has excellent mechanical properties.
The purpose of the invention is realized by the following technical scheme:
the invention provides a high-performance polyolefin composition with excellent dimensional stability, which comprises the following components in parts by weight: 40-70 parts of PP resin, 10-20 parts of COC resin, 5-15 parts of LLDPE, 2-10 parts of toughening agent, 5-15 parts of filler, 0.1-0.6 part of light stabilizer and 0.5-1.5 parts of other auxiliary agents.
The PP resin is homopolymerized PP, copolymerized PP or a mixture of homopolymerized PP and copolymerized PP, and the melt index is 10g/10min-40g/10min.
The COC resin is a cycloolefin copolymer, and the melt index is 10g/10min-30g/10min.
The LLDPE has a melt index of 1g/10min-5g/10min.
The toughening agent is POE, and the melt index is 3g/10min-20g/10min.
The filler is one of talcum powder or mica, and the size of the filler is 3000 meshes-8000 meshes.
The light stabilizer is one or a combination of two of benzophenone UV531, benzotriazole UVP, UV234, UV329, UV326 and hindered amine 770 and 944.
The other auxiliary agents are selected from one or more of titanate coupling agent, silane coupling agent, hindered phenol antioxidant 1010, 1076, 1330, 3114, 245, phosphite antioxidant 168, 619, B900, zinc stearate, polyethylene wax, ethylene bis stearamide, pentaerythritol stearate, magnesium stearate and calcium stearate.
The preparation method comprises the following steps:
step one, preparing materials according to the following components in parts by weight: 40-70 parts of PP resin, 10-20 parts of COC resin, 10-20 parts of LLDPE, 2-10 parts of toughening agent, 5-15 parts of filler, 0.1-0.5 part of light stabilizer and 0.5-1.5 parts of other auxiliary agents;
and step two, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability. Wherein the length-diameter ratio of the screw of the double-screw extruder is 36-44, the extrusion temperature is 190-230 ℃, and the rotation speed of the screw is 300-500 r/min.
The invention can obviously reduce the molding shrinkage of the material by the combination and the proportion of the components and the matching of the melt index, has excellent mechanical property and excellent dimensional stability
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The high-performance polyolefin composition mainly comprises PP resin, COC resin, LLDPE, a toughening agent, a filler, a light stabilizer and other auxiliary agents, wherein the PP resin is homopolymerized PP, copolymerized PP or a mixture of homopolymerized PP and copolymerized PP, the melt index of the PP resin is 10g/10min-40g/10min, the COC resin is a cycloolefin copolymer, the melt index of the COC resin is 10g/10min-30g/10min, the toughening agent is POE, the melt index of the POE resin is 3g/10min-20g/10min, the filler is one of talcum powder or mica, and the size of the filler is 3000 meshes-8000 meshes.
And the light stabilizer is one or a combination of two of benzophenone, benzotriazole and hindered amine.
And the other auxiliary agent is selected from one or a mixture of more of titanate coupling agent, silane coupling agent, hindered phenol antioxidant, phosphite antioxidant, zinc stearate, polyethylene wax, ethylene bis stearamide, pentaerythritol stearate, magnesium stearate and calcium stearate.
Example 1
The preparation method of the polyolefin composition comprises the following steps:
firstly, preparing the following components in parts by weight: 40kg of PP resin, 10kg of COC resin, 10kg of LLDPE5kg of toughening agent POE, 5kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And secondly, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Example 2
The preparation method of the polyolefin composition comprises the following steps:
firstly, preparing the following components in parts by weight: 55kg of PP resin, 10kg of COC resin, 10kg of LLDPE15kg, 5kg of toughening agent POE, 15kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And secondly, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Example 3
The preparation method of the polyolefin composition comprises the following steps:
firstly, preparing the following components in parts by weight: 60kg of PP resin, 10kg of COC resin, 10kg of LLDPE10kg of toughening agent POE, 15kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And secondly, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Example 4
The preparation method of the polyolefin composition comprises the following steps:
firstly, preparing the following components in parts by weight: 52kg of PP resin, 15kg of COC resin, 15kg of LLDPE10kg of toughening agent POE, 15kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And secondly, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Example 5
The preparation method of the polyolefin composition comprises the following steps:
firstly, preparing the following components in parts by weight: 70kg of PP resin, 10kg of COC resin, 10kg of LLDPE5kg of toughening agent POE, 10kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And secondly, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the high-performance polyolefin composition with excellent dimensional stability, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Comparative example 1
In the comparative example, the following components were prepared in parts by weight: 70kg of PP resin, 10kg of toughening agent POE, 20kg of talcum powder, 0.5kg of UV329, 0.8kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And then, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the composition, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
Comparative example 2
In the comparative example, the following components were prepared in parts by weight: 60kg of PP resin, 10kg of COC resin, 10kg of toughening agent POE, 20kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And then, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the composition, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotation speed of the screw is 300-500 r/min.
Comparative example 3
In the comparative example, the following components were prepared in parts by weight: 60kg of PP resin, 10kg of toughening agent POE, 30kg of talcum powder, 0.3kg of UV329, 0.3kg of hindered amine 770, 0.1kg of hindered phenol antioxidant 1010, 0.2kg of phosphite antioxidant 168 and 1kg of calcium stearate.
And then, fully mixing the raw material components in a high-speed mixer, and then mixing and granulating by a screw extruder to obtain the composition, wherein the length-diameter ratio of a screw of the double-screw extruder is 36, the extrusion temperature is 190-230 ℃, and the rotating speed of the screw is 300-500 r/min.
The materials obtained in examples 1 to 5 above, and comparative examples 1 to 3 were tested, and the test results are shown in table 1.
The test method is described below:
the tensile strength was measured according to ISO 527 standard at a test speed of 50mm/min.
The flexural strength was measured according to ISO 178 at a test speed of 2mm/min.
The notched impact strength was measured according to the ISO 179 standard.
The molding shrinkage was measured in accordance with ASTM D955, thickness 2mm, room temperature 23 ℃.
Table 1 results of performance testing
It should be noted that the specifications of the main components are as follows:
PP resin adopts Tai-Mo copolymerized PP4204, and the melt index is 20g/10min;
COC resin, adopting three-well APL6509, and having a melt index of 30g/10min;
LLDPE resin, adopting a Gimerazid 7042, and having a melt index of 2g/10min;
POE, adopting Dow chemical 8411, wherein the melt index is 18g/10min;
talc powder of 5000 meshes;
UV absorbers, using Tinuvin 329;
hindered amine, tinuvin 770;
the antioxidant adopts Irganox 168 and Irganox 1010;
the lubricant is zinc stearate.
As can be seen from the examples and comparative examples in Table 1, the COC, LLDPE and talcum powder adopted in the invention can be used in combination to obviously reduce the molding shrinkage rate, and simultaneously have excellent mechanical properties. And the traditional talcum powder is adopted: comparative examples 1 and 3, and no LLDPE as compatibilizer: in comparative example 2, the low shrinkage and excellent mechanical properties were not achieved.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. The high-performance polyolefin composition with excellent dimensional stability is characterized by comprising the following components in parts by weight: 40-70 parts of PP resin, 10-20 parts of COC resin, 5-15 parts of LLDPE, 2-10 parts of toughening agent, 5-15 parts of filler, 0.1-0.6 part of light stabilizer and 0.5-1.5 parts of other auxiliary agent.
2. The high performance polyolefin composition with excellent dimensional stability according to claim 1, wherein the PP resin is one of homo PP and co PP, or a mixture of homo PP and co PP, and the melt index of the PP resin is 10g/10min-40g/10min.
3. The high-performance polyolefin composition having excellent dimensional stability according to claim 1, wherein the COC resin is a cyclic olefin copolymer, and the COC resin has a melt index of 10g/10min to 30g/10min.
4. The high performance polyolefin composition of claim 1 wherein the LLDPE has a melt index of from 1g/10min to 5g/10min.
5. The high performance polyolefin composition with excellent dimensional stability of claim 1, wherein the toughening agent is POE and the melt index of the toughening agent is 3g/10min to 20g/10min.
6. The high performance polyolefin composition with excellent dimensional stability according to claim 1, wherein the filler is one of talc or mica, and the filler size is 3000 mesh to 8000 mesh.
7. The high performance polyolefin composition with excellent dimensional stability according to claim 1 wherein the light stabilizer is one or a mixture of benzophenones, benzotriazoles, hindered amines.
8. The high performance polyolefin composition with excellent dimensional stability according to claim 1, wherein the other auxiliary agent is selected from the group consisting of titanate coupling agent, silane coupling agent, hindered phenol antioxidant, phosphite antioxidant, zinc stearate, polyethylene wax, ethylene bis stearamide, pentaerythritol stearate, magnesium stearate, calcium stearate or a mixture thereof.
9. A method for preparing a high-performance polyolefin composition with excellent dimensional stability is characterized by comprising the following steps:
preparing materials according to the following components in parts by weight: 40-70 parts of PP resin, 10-20 parts of COC resin, 5-15 parts of LLDPE, 2-10 parts of toughening agent, 5-15 parts of filler, 0.1-0.5 part of light stabilizer and 0.5-1.5 parts of other auxiliary agents;
step two, after the raw material components are fully mixed in a high-speed mixer, the raw material components are mixed and granulated by a screw extruder to obtain a high-performance polyolefin composition with excellent dimensional stability;
wherein the length-diameter ratio of the screw of the double-screw extruder is 36-44, the extrusion temperature is 190-230 ℃, and the rotation speed of the screw is 300-500 r/min.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107383740A (en) * | 2017-08-25 | 2017-11-24 | 广东壹豪新材料科技股份有限公司 | A kind of PP/COC alloy materials and preparation method thereof of high intensity, low-shrinkage |
| CN108485065A (en) * | 2018-04-04 | 2018-09-04 | 青岛国恩科技股份有限公司 | A kind of low-shrinkage polypropylene material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107383740A (en) * | 2017-08-25 | 2017-11-24 | 广东壹豪新材料科技股份有限公司 | A kind of PP/COC alloy materials and preparation method thereof of high intensity, low-shrinkage |
| CN108485065A (en) * | 2018-04-04 | 2018-09-04 | 青岛国恩科技股份有限公司 | A kind of low-shrinkage polypropylene material and preparation method thereof |
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