CN110845792A - Polypropylene composition for automobile water chamber and preparation method thereof - Google Patents
Polypropylene composition for automobile water chamber and preparation method thereof Download PDFInfo
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- CN110845792A CN110845792A CN201911012234.7A CN201911012234A CN110845792A CN 110845792 A CN110845792 A CN 110845792A CN 201911012234 A CN201911012234 A CN 201911012234A CN 110845792 A CN110845792 A CN 110845792A
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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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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C08L2205/00—Polymer mixtures characterised by other features
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Abstract
The invention relates to a polypropylene composition for a water chamber of an automobile and a preparation method thereof, wherein the polypropylene composition comprises the following components: polypropylene resin A, polypropylene resin B, glass fiber, maleic anhydride grafted PP, nucleating agent, pigment and auxiliary agent. The invention has better mechanical property at high temperature, has the advantages of glycol resistance, water absorption resistance and fatigue creep resistance, is particularly suitable for automobile water chambers, and has better economic effect.
Description
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a polypropylene composition for an automobile water chamber and a preparation method thereof.
Background
In order to meet the requirements of development of the automobile industry on material lightweight and high strength, the application of the chopped glass fiber reinforced polypropylene (also called as "chopped glass fiber reinforced PP") in automobiles is more and more extensive, a component which adopts the conventional glass fiber reinforced nylon can be replaced by the high-performance glass fiber reinforced polypropylene, and the chopped glass fiber reinforced PP has the advantages of easiness in processing and forming, low density and excellent cost performance.
One of polypropylene PP and semi-crystalline plastics has the characteristics of low density, easiness in processing and the like, and is the largest variety in the modified plastics for vehicles. With the current trend of light weight of automobiles, the use amount of modified plastics in automobile parts is increased year by year, and the modified plastics mainly comprise automobile interior trims, exterior trims, functional parts and the like. However, in a cooling system automobile water chamber (installed near a radiator) around an engine, a glass fiber reinforced nylon material is currently used, and the chopped glass fiber reinforced PP has the advantages of easiness in processing and forming, low density, excellent cost performance and the like which are not possessed by other materials.
However, the chopped alkali-free glass fiber used in the current chopped glass fiber reinforced PP has low comprehensive performance, especially poor high temperature performance, cannot be directly applied to automobile water chambers, and needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a polypropylene composition for an automobile water chamber and a preparation method thereof, and overcoming the defect of low comprehensive performance of short glass fiber reinforced PP.
The invention provides a polypropylene composition for an automobile water chamber, which comprises the following components in parts by weight:
the polypropylene resin A is homopolymerized polypropylene resin, the melt Mass Flow Rate (MFR) (230 ℃, 2.16Kg) is 1-50 g/10min, and the preferable melt mass flow rate is 3-30 g/10 min.
The polypropylene resin B is polypropylene with long chain branches, has high melt strength, and has a melt Mass Flow Rate (MFR) of 0.5-50 g/10min and a melt strength of 25-38 cN.
The glass fiber is chopped alkali-free glass fiber, the length of the glass fiber is 3.0-9.0mm, the diameter of the glass fiber is 7-17 mu m, and S-1 glass fiber is preferred.
The nucleating agent is at least one of sorbitol nucleating agent, organic phosphate nucleating agent and talcum powder.
The pigment is carbon black master batch.
The auxiliary agent is at least one of an antioxidant and a lubricant.
The antioxidant is at least one of hindered phenol and phosphite antioxidant. Specifically, it may be one or a mixture of two or more of 1010, 1076, 3114, 168 and PEP-36.
The lubricant is at least one of N, N-ethylene bis stearamide, polyethylene wax, oxidized polyethylene wax, calcium stearate and zinc stearate, and the lubricant is added to ensure that the material has good demolding performance during injection molding.
The invention also provides a preparation method of the polypropylene composition for the water chamber of the automobile, which comprises the following steps:
uniformly premixing polypropylene resin A, polypropylene resin B, maleic anhydride grafted PP, a nucleating agent and an auxiliary agent, putting the mixture into a double-screw extruder from a main feeding port, adding glass fiber into the extruder at a side feeding port, and performing melt extrusion and grain cutting to obtain a glass fiber reinforced polypropylene composite material;
wherein the twin-screw extrusion process parameters are as follows: the temperature of a first area of the main machine is 100-120 ℃, the temperature of a second area is 200-220 ℃, the temperature of a third area is 200-220 ℃, the temperature of a fourth area is 200-220 ℃, the temperature of a fifth area is 200-220 ℃, the temperature of a sixth area is 180-200 ℃, the temperature of a seventh area is 180-200 ℃, the temperature of an eighth area is 180-200 ℃, the temperature of a ninth area is 200-220 ℃, and the temperature of a tenth area is 200-220 ℃; the rotation speed of the main machine is 200-350 rpm.
Advantageous effects
(1) The invention has better mechanical property at high temperature, has the advantages of glycol resistance, water absorption resistance and fatigue creep resistance, is particularly suitable for automobile water chambers, and has better economic effect.
(2) The invention selects high melt strength polypropylene and nucleating agent modified polypropylene resin, utilizes the long branched chain structure of the high melt strength polypropylene and the corresponding nucleating agent, and improves the high temperature and glycol resistance of the material in a synergistic manner.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The materials used for the examples and comparative examples are as follows:
polypropylene resin a: homo-polypropylene, produced by concha Hawaii, HP500N, has a melt index of 10g/10min (ISO 1133).
Polypropylene resin B: high melt strength polypropylene, WB140HMS, produced by northern Europe, has a melt index of 2.0g/10min (ISO 1133).
The maleic anhydride grafted polypropylene is produced by the company of Acco ;
glass fiber: a product of type T538A from Taishan glass fibre company Limited was selected, having a length of 4.5mm and an average diameter of 13 μm.
The preparation method comprises the following steps: uniformly premixing polypropylene resin A, polypropylene resin B, maleic anhydride grafted PP, a nucleating agent and an auxiliary agent, putting the mixture into a double-screw extruder from a main feeding port, adding short glass fibers into the extruder at a side feeding port, and performing melt extrusion and grain cutting to obtain a short glass fiber reinforced polypropylene composite material;
the length-diameter ratio of the twin-screw extruder is 40: 1. The temperature of a first area is 110 ℃, the temperature of a second area is 200 ℃, the temperature of a third area is 200 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 200 ℃, the temperature of a sixth area is 200 ℃, the temperature of a seventh area is 200 ℃, the temperature of an eighth area is 200 ℃, the temperature of a ninth area is 200-220 ℃, and the temperature of a tenth area is 200 ℃; the rotation speed of the main machine is 300 rpm.
Examples 1 to 4 and comparative examples 1 to 3 polypropylene compositions were prepared according to the formulation shown in table 1 by the above method, and then mechanical specimens were injection-molded from the compositions to test the mechanical tensile strength of the materials at normal and high temperatures and the performance retention rate of the cooling liquid resistance, respectively.
TABLE 1 formulation of Polypropylene compositions of the examples and comparative examples
| Item | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Polypropylene resin A | 58 | 53 | 43 | 33 | 63.3 | 63 | 53.3 |
| Glass fiber | 30 | 30 | 30 | 50 | 30 | 30 | 30 |
| Polypropylene resin B | 5 | 10 | 20 | 10 | / | / | 10 |
| Nucleating agent TMP-5 | 0.3 | 0.3 | 0.3 | 0.5 | / | 0.3 | / |
| Maleic anhydride grafted PP | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Carbon black masterbatch | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Antioxidant 1010 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Antioxidant 168 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 |
| Lubricant EBS | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 |
Note: the numbers in the table are parts by weight.
The performance test method comprises the following steps:
① tensile Strength ISO 527.
② heat distortion temperature ISO 75-1, 1.80MPa,
③ retention ratio of resistance to cooling liquid, the test conditions are as follows:
a) test medium: 50/50 liquid coolant/water (maintaining a maximum liquid level);
b) temperature of test medium: 120 ℃;
c) and (3) test period: 1000 h.
The performance test results are shown in table 2:
TABLE 2 surface Property test results of the polypropylene compositions of examples and comparative examples
The test results in the table 2 show that the high-temperature mechanical property of the polypropylene with high melt strength is obviously improved in the examples 1-3, the experimental data of the examples 2 and the comparative examples 1-3 show that the polypropylene with high melt strength and the nucleating agent are added, and the high-temperature property of the material is obviously improved after the material is produced by a certain process, and the data comparison between the example 2 and the comparative examples 2 and 3 shows that the tensile strength of 120 ℃ can be synergistically improved by using the high melt strength and the nucleating agent, the cooling liquid resistance retention rate is improved, and the thermal deformation temperature is also improved, so that the high-temperature high-melt-strength nucleating agent is suitable for preparing automobile water chamber parts.
Claims (10)
1. A polypropylene composition for automobile water chambers is characterized in that: the coating comprises the following components in parts by weight:
2. the polypropylene composition according to claim 1, wherein: the polypropylene resin A is homopolymerized polypropylene resin, and the mass flow rate of a melt is 1-50 g/10 min.
3. The polypropylene composition according to claim 1, wherein: the polypropylene resin B is polypropylene with long-chain branches, the melt mass flow rate is 0.5-50 g/10min, and the melt strength is 25-38 cN.
4. The polypropylene composition according to claim 1, wherein: the glass fiber is chopped alkali-free glass fiber, the length is 3.0-9.0mm, and the diameter is 7-17 μm.
5. The polypropylene composition according to claim 1, wherein: the nucleating agent is at least one of sorbitol nucleating agent, organic phosphate nucleating agent and talcum powder.
6. The polypropylene composition according to claim 1, wherein: the pigment is carbon black master batch.
7. The polypropylene composition according to claim 1, wherein: the auxiliary agent is at least one of an antioxidant and a lubricant.
8. The polypropylene composition according to claim 7, wherein: the antioxidant is at least one of hindered phenol and phosphite antioxidant.
9. The polypropylene composition according to claim 7, wherein: the lubricant is at least one of N, N-ethylene bis stearamide, polyethylene wax, oxidized polyethylene wax, calcium stearate and zinc stearate.
10. A method for preparing the polypropylene composition for water chamber of automobile according to claim 1, comprising:
uniformly premixing polypropylene resin A, polypropylene resin B, maleic anhydride grafted PP, a nucleating agent and an auxiliary agent, putting the mixture into a double-screw extruder from a main feeding port, adding glass fiber into the extruder at a side feeding port, and performing melt extrusion and grain cutting to obtain a glass fiber reinforced polypropylene composite material;
wherein the twin-screw extrusion process parameters are as follows: the temperature of a first area of the main machine is 100-120 ℃, the temperature of a second area is 200-220 ℃, the temperature of a third area is 200-220 ℃, the temperature of a fourth area is 200-220 ℃, the temperature of a fifth area is 200-220 ℃, the temperature of a sixth area is 180-200 ℃, the temperature of a seventh area is 180-200 ℃, the temperature of an eighth area is 180-200 ℃, the temperature of a ninth area is 200-220 ℃, and the temperature of a tenth area is 200-220 ℃; the rotation speed of the main machine is 200-350 rpm.
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| CN201911012234.7A CN110845792A (en) | 2019-10-23 | 2019-10-23 | Polypropylene composition for automobile water chamber and preparation method thereof |
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| CN201911012234.7A CN110845792A (en) | 2019-10-23 | 2019-10-23 | Polypropylene composition for automobile water chamber and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375297A (en) * | 2020-11-27 | 2021-02-19 | 江苏金发科技新材料有限公司 | Glass fiber reinforced PP/PA66 composite material for water chamber of new energy automobile and preparation method thereof |
| CN112480538A (en) * | 2020-12-03 | 2021-03-12 | 武汉金牛经济发展有限公司 | Long-chain branched PPH (pentatricopeptide repeat) load beta nucleating agent master batch and preparation method thereof |
| CN112831124A (en) * | 2021-01-25 | 2021-05-25 | 青岛海尔新材料研发有限公司 | Visual high-temperature-resistant hydrolysis-resistant long glass fiber reinforced polypropylene composite material for automobile water chamber |
| CN114773727A (en) * | 2022-04-13 | 2022-07-22 | 金发科技(印度)有限公司 | Polypropylene composite material and preparation method and application thereof |
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2019
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112375297A (en) * | 2020-11-27 | 2021-02-19 | 江苏金发科技新材料有限公司 | Glass fiber reinforced PP/PA66 composite material for water chamber of new energy automobile and preparation method thereof |
| CN112480538A (en) * | 2020-12-03 | 2021-03-12 | 武汉金牛经济发展有限公司 | Long-chain branched PPH (pentatricopeptide repeat) load beta nucleating agent master batch and preparation method thereof |
| CN112831124A (en) * | 2021-01-25 | 2021-05-25 | 青岛海尔新材料研发有限公司 | Visual high-temperature-resistant hydrolysis-resistant long glass fiber reinforced polypropylene composite material for automobile water chamber |
| CN114773727A (en) * | 2022-04-13 | 2022-07-22 | 金发科技(印度)有限公司 | Polypropylene composite material and preparation method and application thereof |
| CN114773727B (en) * | 2022-04-13 | 2023-12-22 | 金发科技(印度)有限公司 | Polypropylene composite material and preparation method and application thereof |
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