CN111378229A - Long-term heat aging resistant polypropylene composition and preparation method thereof - Google Patents
Long-term heat aging resistant polypropylene composition and preparation method thereof Download PDFInfo
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- CN111378229A CN111378229A CN202010163913.0A CN202010163913A CN111378229A CN 111378229 A CN111378229 A CN 111378229A CN 202010163913 A CN202010163913 A CN 202010163913A CN 111378229 A CN111378229 A CN 111378229A
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
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- 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
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
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- 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
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
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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
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a long-term thermal aging resistant polypropylene composition and a preparation method thereof, and is characterized in that the material has excellent mechanical property retention rate in a high-temperature thermal aging environment, and can be used as a material with higher requirement on long-term thermal aging around an automobile engine. The long-term heat aging resistant polypropylene composition comprises the following components in percentage by weight: 84.55-57.9% of polypropylene, 15-40% of talcum powder, 0.1-0.3% of main antioxidant, 0.1-0.3% of auxiliary antioxidant, 0.05-0.2% of hindered amine, 0.1-0.3% of thioester antioxidant and 0.1-1% of acid acceptor. The product of the invention has excellent mechanical property retention rate in the high-temperature aging process, and fully solves the problem of precipitation stickiness of the traditional antioxidant system by utilizing the synergistic effect among the auxiliary agents, the mass PV1306 standard can be completely prevented from precipitation after being tested for 10 periods, the requirement of the maximum precipitation stickiness grade 0 grade of PV1306 is met, and the requirement of peripheral parts of an automobile engine on the long-term thermal aging resistance of the material can be fully met.
Description
Technical Field
The invention relates to a long-term heat aging resistant polypropylene composition and a preparation method thereof, in particular to peripheral parts of an automobile engine with higher requirement on long-term heat aging resistance.
Background
With the rapid development of the automobile industry, the environmental pollution caused by automobile exhaust is more and more serious, so that the pressure of energy conservation and emission reduction of automobiles is more and more high, and the reduction of oil consumption due to the weight reduction of automobile bodies is an important method for improving the emission pollution of the automobile exhaust. The polypropylene material can quickly replace engineering plastics such as polyamide and the like due to the advantages of excellent mechanical property, high cost performance, environmental protection, recyclability and the like, and becomes a preferred material for light weight of automobiles.
At present, the highest thermal aging standard of polypropylene materials around automobile engines is that after the polypropylene materials are subjected to thermal aging at 150 ℃/1000h specified by mass automobiles, the surfaces of parts have no aging failure phenomena such as pulverization, cracking and the like. However, with the increase of the service life of the automobile, the aging standard can not meet the development requirement of the automobile industry gradually. In the industry, automobile manufacturers provide a requirement of 150 ℃/2000h thermal aging, and the current polypropylene thermal aging technology is difficult to meet the standard, so that a new technology is urgently needed to be developed to further improve the long-term thermal aging resistance of a polypropylene material and meet the latest requirements of the automobile industry.
In order to ensure a certain aging requirement of the polypropylene material around the automobile engine, a large amount of antioxidant is added, and in order to meet the aging requirement of a higher standard, the traditional method is to increase the addition amount of the antioxidant, but the phenomenon that the solubility of the antioxidant in the polypropylene is saturated to cause separation and stickiness is caused by simply increasing the addition amount of the antioxidant, and the oxidation strengthening effect is caused after the concentration of the antioxidant reaches a certain degree, but the long-term thermal aging is not favorable.
In order to solve the contradiction between the thermal aging performance and the precipitation stickiness and the oxidation enhancement effect, the invention abandons the defect of single formula of the traditional antioxidant system, fully utilizes the synergistic effect among the auxiliary agents and develops the antioxidant system with high efficiency, low addition and no precipitation. The innovation points of the invention can be summarized as the following two points: high and low molecular weight hindered amines
1) Hindered amine and thioester antioxidant are compounded, so that the synergistic effect between the hindered amine and the thioester antioxidant is fully exerted, and the high-efficiency low addition amount and no precipitation of an antioxidant system are realized;
2) various types of acid scavengers are adopted for compounding, on one hand, acidic substances generated in the aging process of the thioester antioxidant are fully neutralized, so that the antagonistic action between the thioester and the alkaline hindered amine is inhibited, on the other hand, the various types of acid scavengers are compounded to generate a synergistic action, so that the dosage of the acid scavengers is reduced.
The product of the invention has the characteristics of excellent long-term thermal aging resistance and no precipitation, and completely meets the requirements of peripheral parts of an automobile engine on materials.
Disclosure of Invention
The invention discloses a long-term heat aging resistant polypropylene composition and a preparation method thereof, aiming at overcoming the heat aging risk of peripheral parts of the traditional automobile engine.
The yellowing-resistant polypropylene compound comprises the following components in percentage by weight:
84.55 to 57.9 percent of polypropylene
15 to 40 percent of talcum powder
0.1 to 0.3 percent of main antioxidant
0.1 to 0.3 percent of auxiliary antioxidant
0.05 to 0.2 percent of hindered amine
0.1 to 0.3 percent of thioester antioxidant
0.1 to 1 percent of acid absorbent
Said primary antioxidant is selected from the group consisting of various hindered phenols, semi-hindered phenolic antioxidants, and mixtures thereof;
the secondary antioxidant is selected from various types of phosphite esters or mixtures thereof;
said hindered amine is selected from hindered amines having a molecular weight between 400-4000 or mixtures thereof;
said thioesters are selected from thioesters of various molecular weights or mixtures thereof;
the acid absorbent is one or a mixture of stearate, hydroxy stearate and hydrotalcite;
the talcum powder is selected from high-purity superfine talcum powder with the silicon dioxide content of more than 56 percent and the mesh number of 3000-10000.
The preparation method of the long-term heat aging resistant polypropylene composition comprises the following steps:
melting, mixing and dispersing polypropylene, talcum powder, a main antioxidant, an auxiliary antioxidant, hindered amine, a thioester antioxidant and an acid-absorbing agent in a double-screw extruder with the length-diameter ratio of 40: 1, extruding and granulating to finally obtain the product.
The preparation method of the long-term heat aging resistant polypropylene composition is characterized in that the polypropylene composition is subjected to melt mixing and dispersion, and the extrusion temperature is 170-220 ℃.
The product of the invention has excellent mechanical property retention rate in the high-temperature aging process, after the harsh thermal oxidation aging test of 150 ℃/2000h in the automobile industry, the tensile strength retention rate of the material is more than or equal to 90%, and the problem of precipitation stickiness of the traditional antioxidant system is completely solved due to the synergistic effect among the auxiliaries, the product can be completely prevented from precipitating after the popular PV1306 standard test is carried out for 10 periods, the requirement of the highest precipitation stickiness grade 0 grade of PV1306 is met, and the requirement of peripheral parts of an automobile engine on long-term thermal aging resistance of the material can be completely met.
Claims (4)
1. The polypropylene composition with long-term heat aging resistance is characterized by comprising the following components in percentage by weight:
84.55 to 57.9 percent of polypropylene
15 to 40 percent of talcum powder
0.1 to 0.3 percent of main antioxidant
0.1 to 0.3 percent of auxiliary antioxidant
0.05 to 0.2 percent of hindered amine
0.1 to 0.3 percent of thioester antioxidant
0.1 to 1 percent of acid absorbent
1) Said primary antioxidant is selected from the group consisting of various hindered phenols, semi-hindered phenolic antioxidants, and mixtures thereof;
2) the secondary antioxidant is selected from various types of phosphite esters or mixtures thereof;
3) said hindered amine is selected from hindered amines having a molecular weight between 400-4000 or mixtures thereof;
4) said thioesters are selected from thioesters of various molecular weights or mixtures thereof;
5) the acid absorbent is one or a mixture of stearate, hydroxy stearate, alkaline earth metal oxide and hydrotalcite;
6) the talcum powder is selected from high-purity superfine talcum powder with the silicon dioxide content of more than 56 percent and the mesh number of 3000-10000.
2. The polypropylene composition of claim 1, wherein the polypropylene is selected from homo-polypropylene, co-polypropylene, random co-polypropylene or a mixture thereof having a melt flow rate of 1-100 g/10 min.
3. The preparation method of the long-term heat aging resistant polypropylene composition according to any one of claims 1-2 comprises the following steps:
melting, mixing and dispersing polypropylene, talcum powder, a main antioxidant, an auxiliary antioxidant, hindered amine, a thioester antioxidant and an acid-absorbing agent in a double-screw extruder with the length-diameter ratio of 40: 1, extruding and granulating to finally obtain the product.
4. The method for preparing the long-term heat aging resistant polypropylene composition as claimed in claim 3, wherein the melt mixing and dispersion are carried out at an extrusion temperature of 170-220 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010163913.0A CN111378229A (en) | 2020-03-10 | 2020-03-10 | Long-term heat aging resistant polypropylene composition and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010163913.0A CN111378229A (en) | 2020-03-10 | 2020-03-10 | Long-term heat aging resistant polypropylene composition and preparation method thereof |
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| Publication Number | Publication Date |
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| CN111378229A true CN111378229A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010163913.0A Withdrawn CN111378229A (en) | 2020-03-10 | 2020-03-10 | Long-term heat aging resistant polypropylene composition and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112852051A (en) * | 2020-12-28 | 2021-05-28 | 上海金发科技发展有限公司 | High-temperature-resistant high-humidity-resistant short glass fiber reinforced polypropylene composite material and preparation method thereof |
-
2020
- 2020-03-10 CN CN202010163913.0A patent/CN111378229A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112852051A (en) * | 2020-12-28 | 2021-05-28 | 上海金发科技发展有限公司 | High-temperature-resistant high-humidity-resistant short glass fiber reinforced polypropylene composite material and preparation method thereof |
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Application publication date: 20200707 |