CN114621523A - Polypropylene composite material and preparation method and application thereof - Google Patents
Polypropylene composite material and preparation method and application thereof Download PDFInfo
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- CN114621523A CN114621523A CN202210308368.9A CN202210308368A CN114621523A CN 114621523 A CN114621523 A CN 114621523A CN 202210308368 A CN202210308368 A CN 202210308368A CN 114621523 A CN114621523 A CN 114621523A
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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
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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
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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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
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Abstract
The invention discloses a polypropylene composite material and a preparation method and application thereof, and relates to the technical field of high polymer materials. The polypropylene composite material comprises the following components in parts by weight: 30-60 parts of homopolymerized polypropylene, 20-40 parts of copolymerized polypropylene, 10-24 parts of polyethylene, 2-8 parts of compatilizer, 0.2-1 part of nucleating agent and 0.2-1 part of antioxidant. The components are selected, so that the prepared polypropylene composite material has good mechanical property and transparency, has high welding strength, and is suitable for industrial application.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a polypropylene composite material and a preparation method and application thereof.
Background
Polypropylene (PP) is one of five general-purpose plastics, has become the fastest-developing variety in general-purpose plastics due to simple synthesis method, rich raw material sources, low density, good physical and mechanical properties and processing properties, and is widely applied to the industries of household appliances, communication, packaging, transportation and the like.
Polypropylene has many advantages that are not attainable with other plastics, but also has some disadvantages, the rigidity and toughness being difficult to balance: the high-rigidity product is difficult to meet the low-temperature test requirement of the kettle; in addition, polypropylene is a semi-crystalline material, the volume of spherulites is large, light scattering exists on the interface, the transparency is reduced, and the requirement of the automobile kettle on the transparency of the material is difficult to meet. At present, the processing technology of the automobile kettle mainly comprises the steps of forming an upper kettle body and a lower kettle body through polypropylene blow molding or injection molding, and welding the upper kettle body and the lower kettle body in a hot plate welding mode to form a complete sealing part. The conventional transparent polypropylene product has low strength, thin melt layer and low welding strength, and if the melt strength is directly improved, the viscosity of the material is enhanced, and the transparency is reduced.
Therefore, the prepared transparent weldable polypropylene compound has excellent rigidity and toughness balance, high welding strength on the premise of not losing material transparency, and excellent industrial application prospect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the polypropylene composite material with good rigidity, toughness, transparency and welding strength, and the preparation method and the application thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a polypropylene composite material comprises the following components in parts by weight: 30-60 parts of homopolymerized polypropylene, 20-40 parts of copolymerized polypropylene, 10-24 parts of polyethylene, 2-8 parts of compatilizer, 0.2-1 part of nucleating agent and 0.2-1 part of antioxidant. The homopolymerized polypropylene has higher crystallinity, more regular molecular chains and higher strength, but has poorer toughness; the regularity of the molecular chain of the copolymerized polypropylene is relatively low, the toughness is higher, but correspondingly, the strength is lower; the polyethylene has relatively simple structure, hydrogen atom has smaller polarity than that of side methyl of polypropylene, intermolecular force is relatively weaker, flexibility and turnover are better, and better interfusion winding combination can be realized in a surface melting area in the welding process, so that higher welding tensile strength performance is obtained. According to the invention, the types and the dosage of the resin, and the dosages of the compatilizer, the nucleating agent and the antioxidant are selected, so that the prepared polypropylene composite material has good strength, rigidity and toughness, and has certain transparency and welding performance.
Preferably, the weight ratio of the homopolymerized polypropylene to the copolymerized polypropylene to the polyethylene is (5-6): (2-3): (1-1.8). When the proportion of the homo-polypropylene is higher, the rigidity, the toughness and the toughness of the material are weak, and the kettle body is easy to crack and leak liquid when the low-temperature external force is applied; when the proportion of the polypropylene copolymer is higher, the rigidity of the material is insufficient, the kettle body is easy to deform under the high-temperature and high-pressure environment, and liquid leakage is caused due to insufficient air tightness of parts; the content of polyethylene is too low, the blending effect is relatively poor, and the welding strength is not obviously improved; too high, the tensile strength of the material itself is reduced, and the comprehensive strength of the product is affected. When the three components are compounded according to the proportion, the mechanical property, the welding property and the transmittance of the polypropylene composite material can be synergistically improved.
Preferably, the homopolymerized polypropylene has a melt mass flow rate of 0.1-5 g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard; the melt mass flow rate of the copolymerized polypropylene is 0.1-9 g/10min measured at 230 ℃ under a load of 2.16kg according to the ISO1133-1-2011 standard; the polyethylene has a melt mass flow rate of 0.1-5 g/10min measured at 190 ℃ under a load of 2.16kg according to ISO 1133-1-2011. Generally, the melt index is too high, which means that the molecular weight of the resin is small, the intermolecular winding structure is relatively unstable, the structure is easily damaged when the resin is stretched or extruded by external force, the melt viscosity of the material is low, the welding strength is low, and the weldability of the prepared polypropylene composite material is reduced.
Preferably, the compatibilizer comprises an ethylene propylene block copolymer and a propylene butylene block copolymer; the ethylene-propylene block copolymer and the polypropylene have good compatibility, and the propylene-butylene block copolymer and the polypropylene have good compatibility, so that the polyethylene and the polypropylene can be better compatible by compounding the ethylene-propylene block copolymer and the polypropylene. The nucleating agent is a third-generation sorbitol transparent nucleating agent, and can be used for refining polypropylene spherulite crystal grains and enabling the distribution of the crystal grains to be more uniform; the finer the crystal grain is, the lower the interface light scattering is, and the transparency is improved; the more uniform the distribution of the crystal grains, the smaller the probability of stress concentration in the loading process of the polypropylene product, and the rigidity and toughness of the polypropylene composite material can be synchronously improved.
Preferably, the mass ratio of the ethylene-propylene block copolymer to the propylene-butylene block copolymer is (0.5-1.5): 1. By controlling the proportion of the two components in the compatilizer within the range, the transparency of the polypropylene composite material can be further improved.
Preferably, the antioxidant is at least one of hindered phenol antioxidant and phosphite antioxidant, such as antioxidant 1010, antioxidant 168, antioxidant 1790, etc.
Meanwhile, the invention also discloses a preparation method of the polypropylene composite material, which comprises the following steps: and uniformly mixing the components according to the proportion, adding the mixture into a double-screw extruder for melt blending, extruding and granulating to obtain the polypropylene composite material.
Preferably, the components are mixed in a high-speed mixer with nitrogen protection for 3-5 minutes, then the mixture is added into a double-screw extruder with the length-diameter ratio (30-50): 1 for melting, mixing and dispersing, and the mixture is plasticized and granulated by the double-screw extruder, wherein the temperature of the double-screw extruder is 100-200 ℃, the rotating speed of the screw is 350-450 r/min, and the vacuum degree is-0.04-0.08 MPa.
Compared with the prior art, the invention has the beneficial effects that: the polypropylene composite material is prepared by compounding the homo-polypropylene, the co-polypropylene and the polyethylene, and selecting the dosage of the compatilizer, the nucleating agent and the antioxidant, so that the polypropylene composite material has good welding performance, good rigidity and toughness and high light transmittance. In addition, by compounding the two compatilizers, the compatibility of the system can be improved to the maximum extent, and the transparency and the welding strength of the polypropylene composite material are further improved.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
The materials used in the examples and comparative examples are as follows:
homo-polypropylene 1: PP B1101 produced by chemical fiber company in Taiwan has a melt mass flow rate of 0.5g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
homo-polypropylene 2: PP HP550J, manufactured by Barcel corporation, having a melt mass flow rate of 3.5g/10min measured at 230 ℃ under a load of 2.16kg in accordance with ISO 1133-1-2011;
homo-polypropylene 3: HU330 manufactured by Dadall company, according to ISO1133-1-2011, has a melt mass flow rate of 5g/10min measured at 230 ℃ under a load of 2.16 kg;
homo-polypropylene 4: PP 1100N produced by Shenhua company has a melt mass flow rate of 11g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
copolymerized polypropylene 1: PP 4220 produced by Yanshan petrochemical company has a melt mass flow rate of 0.4g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
copolymerized polypropylene 2: PP T4802 produced by Yanshan petrochemical company has a melt mass flow rate of 2.5g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
copolymer polypropylene 3: PP B4908 manufactured by Yanshan petrochemical company has a melt mass flow rate of 8.9g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
copolymerized polypropylene 4: PP K4912 produced by Yanshan petrochemical company has a melt mass flow rate of 12g/10min measured at 230 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
polyethylene 1: HDPE 5502BN produced by Katalr chemical company has a melt mass flow rate of 0.35g/10min measured at 190 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
polyethylene 2: HDPE HD0202L from Barcel corporation, having a melt mass flow rate of 5g/10min measured at 190 ℃ under a load of 2.16kg in accordance with ISO 1133-1-2011;
polyethylene 3: HDPE 8008 produced by Mount-mountain petrochemical company has a melt mass flow rate of 8g/10min measured at 190 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard;
1 part of compatilizer: ethylene propylene block copolymer, Hifax 1956A manufactured by basale corporation;
compatilizer 2: propylene butene block copolymer, D5545 by Dow chemical company;
a compatibilizer 3: maleic anhydride grafted polypropylene, CA100 by arkema;
a compatilizer 4: maleic anhydride grafted polyethylene, ZJ-800E manufactured by WANHHAN XIONG JIAO Co;
nucleating agent: the third generation sorbitol transparent nucleating agent is sold in the market;
antioxidant: antioxidant 1010, commercially available; antioxidant 168, commercially available; the mass ratio of the two is 1: 1.
The nucleating agents and antioxidants used in the examples and comparative examples were the same species.
Examples 1 to 13
In the examples of the polypropylene composite material of the present invention, the formula of examples 1 to 13 is shown in table 1, and the preparation method is as follows: adding the components into a high-speed mixer according to the proportion, mixing for 3 minutes, adding the mixture into a double-screw extruder with the length-diameter ratio of 44:1 of a screw, and carrying out melt blending, extrusion and granulation to obtain the polypropylene composite material; the processing temperature from the feeding port to the die head is respectively 100 ℃, 180 ℃, 200 ℃ and the rotating speed of the main machine is 500 r/min.
Comparative examples 1 to 2
Comparative examples 1 to 2 are polypropylene composites, the formulations of which are shown in table 1, and the preparation method is the same as in example 1.
TABLE 1 (parts by weight)
Examples 14 to 16
In the embodiments of the polypropylene composite material of the present invention, the embodiments 14 to 16 are different from the embodiment 1 only in that the kinds of the homo-polypropylene are different, and are respectively homo-polypropylene 2 to 4.
Examples 17 to 19
In the examples of the polypropylene composite material of the present invention, examples 17 to 19 are different from example 1 only in that the kinds of the copolymerized polypropylene are different, and are copolymerized polypropylenes 2 to 4, respectively.
Examples 20 to 21
In the examples of the polypropylene composite material of the present invention, examples 20 to 21 are different from example 1 only in that the polyethylene types are different, and are polyethylene 2 to 3, respectively.
The examples and comparative examples were subjected to performance tests with reference to the following criteria, the results of which are shown in table 2:
tensile strength: testing according to ISO 527-2-2012, 50 mm/min;
notched izod impact strength: according to ISO180-2000, 4mm, 23 ℃;
light transmittance: according to GB 2410-80-2008, the thickness of the product is 1 mm;
welding tensile strength: and (4) hot plate welding, wherein the welding set melting temperature is 275 ℃, the melting time is 8s, and the cooling time is 12 s. Weld tensile strength tests were performed with reference to ISO 527-2-2012, 4mm thick weld plates, 50 mm/min.
TABLE 2
As can be seen from Table 2, the welding strength of comparative examples 1 to 2 was lower than 13MPa, and the weldability was poor. The dosage of the polyethylene in the comparative example 1 is not in the limited range of the invention, which causes the dosage relationship among the homo-polypropylene, the co-polypropylene, the compatilizer and the polyethylene to be greatly changed, and further greatly reduces the welding tensile strength of the polypropylene composite material. The polypropylene composite material of comparative example 2 had drastically reduced rigidity and strength and significantly poorer weldability due to the excessively high amount of the compatibilizer, which also reduced the transparency of the polypropylene composite material.
In addition, the test results of the comparative examples 5 to 8 and the example 3 show that when the mass ratio of the ethylene-propylene block copolymer to the propylene-butylene block copolymer does not meet (0.5 to 1.5):1, the prepared polypropylene composite material has relatively poor comprehensive performance.
The test results of comparative example 9 and example 3 show that, compared with maleic anhydride grafted polypropylene and maleic anhydride grafted polyethylene, the ethylene propylene block copolymer and the propylene butylene block copolymer have better compatibility, and are more beneficial to improving the welding performance of the polypropylene composite material.
As shown by the test results of comparative example 13 and examples 10 to 12, when the weight ratio of the homo-polypropylene, the co-polypropylene and the polyethylene is (5 to 6): (2-3): (1-1.8) the polypropylene material with better welding performance can be prepared, and meanwhile, the polypropylene material has good rigidity, toughness and light transmission.
The test results of the comparative example 16 and the examples 14 to 15 show that the melt mass flow rate of the homo-polypropylene also has a great influence on the performance, and when the melt mass flow rate of the homo-polypropylene exceeds 5g/10min, the molecular chain of the homo-polypropylene is relatively short, the molecular weight is low, the melt strength is low, the welding performance of the prepared polypropylene composite material is greatly reduced, and the light transmittance is also reduced to a certain extent. Similarly, the test results of comparative examples 19 and 17 to 18, and examples 21 and 20 show that the melt index of the polypropylene copolymer and the polyethylene also have a great influence on the performance of the polypropylene composite material.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The polypropylene composite material is characterized by comprising the following components in parts by weight: 30-60 parts of homopolymerized polypropylene, 20-40 parts of copolymerized polypropylene, 10-24 parts of polyethylene, 2-8 parts of compatilizer, 0.2-1 part of nucleating agent and 0.2-1 part of antioxidant.
2. The polypropylene composite material according to claim 1, wherein the weight ratio of the homo-polypropylene to the co-polypropylene to the polyethylene is (5-6): (2-3): (1-1.8).
3. The polypropylene composite according to claim 1, wherein the homopolypropylene has a melt mass flow rate of 0.1 to 5g/10min, measured at 230 ℃ under a load of 2.16kg, in accordance with ISO 1133-1-2011; the melt mass flow rate of the copolymerized polypropylene is 0.1-9 g/10min measured at 230 ℃ under a load of 2.16kg according to the ISO1133-1-2011 standard; the polyethylene has a melt mass flow rate of 0.1-5 g/10min measured at 190 ℃ under a load of 2.16kg according to ISO1133-1-2011 standard.
4. The polypropylene composite of claim 1, wherein the compatibilizer comprises an ethylene propylene block copolymer and a propylene butylene block copolymer.
5. The polypropylene composite according to claim 4, wherein the mass ratio of the ethylene propylene block copolymer to the propylene butylene block copolymer is (0.5-1.5): 1.
6. The polypropylene composite of claim 1, wherein the nucleating agent is a sorbitol-based transparent nucleating agent.
7. The polypropylene composite of claim 1, wherein the antioxidant is at least one of a hindered phenolic antioxidant and a phosphite antioxidant.
8. A method for preparing the polypropylene composite material as claimed in any one of claims 1 to 7, wherein the method comprises the following steps: and uniformly mixing the components according to the proportion, adding the mixture into a double-screw extruder for melt blending, extruding and granulating to obtain the polypropylene composite material.
9. Use of a polypropylene composite according to any one of claims 1 to 7 in the field of transparent weldable automotive kettles.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115418052A (en) * | 2022-09-29 | 2022-12-02 | 武汉金发科技有限公司 | Polypropylene composite material and preparation method and application thereof |
| CN115651312A (en) * | 2022-11-01 | 2023-01-31 | 江苏沃特新材料科技有限公司 | Composite material for light diffusion polypropylene blow molding and preparation method thereof |
| CN116120669A (en) * | 2023-03-22 | 2023-05-16 | 得力集团有限公司 | Anti-drop high-stiffness file box material and preparation method thereof |
| CN116535771A (en) * | 2023-05-05 | 2023-08-04 | 宁波聚久全塑料制品有限公司 | High-light-transmittance PP (Polypropylene) and PE (polyethylene) composite material as well as preparation method and application thereof |
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| CN113912941A (en) * | 2021-10-26 | 2022-01-11 | 金发科技股份有限公司 | Polypropylene composite material and preparation method and application thereof |
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