CN114539671A - High-melt-strength polypropylene composite material and preparation method and application thereof - Google Patents
High-melt-strength polypropylene composite material and preparation method and application thereof Download PDFInfo
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- CN114539671A CN114539671A CN202210281212.6A CN202210281212A CN114539671A CN 114539671 A CN114539671 A CN 114539671A CN 202210281212 A CN202210281212 A CN 202210281212A CN 114539671 A CN114539671 A CN 114539671A
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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 melt strength polypropylene composite material and a preparation method and application thereof, wherein the high melt strength polypropylene composite material comprises the following components in parts by weight: 45-90 parts of polypropylene, 5-40 parts of talcum powder, 2-12 parts of hydrogenated styrene-butadiene block copolymer and 0.5-3 parts of modifier; the modifier is one or a combination of a phthalate coupling agent, an amino silane coupling agent, an aluminum-titanium composite coupling agent, an epoxy silane coupling agent and a PP grafting modifier. The polypropylene composite material prepared by the invention has high melt strength, improves the compatibility of the filler and a matrix, effectively avoids the attenuation of mechanical property, reduces environmental pollution, is suitable for preparing extruded and extruded foaming parts, and can realize 30% weight reduction effect by melt extrusion after being mixed with a foaming agent.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a high melt strength polypropylene composite material, and a preparation method and application thereof.
Background
The polypropylene is a general plastic, has the advantages of high melting point, low density, good chemical stability, easy recovery, low price and the like, and has wide application prospect in the industries of automobiles, household appliances and the like. However, the conventional polypropylene material has no strain hardening effect in a molten state due to the linear structure of molecular chains, so that the melt strength of the conventional polypropylene material is low, and the application of polypropylene is greatly limited. Meanwhile, the molecular chain of the polypropylene is broken under the shearing action of equipment in the melting process, so that the molecular weight is reduced. In addition, the softening point of polypropylene is close to the melting point, and when the temperature is higher than the melting point, the melt strength and viscosity of the polypropylene are reduced sharply, so that the wall thickness of a product is uneven during hot forming, edge curling and shrinkage occur during extrusion, and the problems of foam collapse or bulge and the like occur during extrusion and blow molding foaming.
To solve the above problems, the methods for preparing high melt strength polypropylene in the prior art are generally classified into two types: firstly, polypropylene and other components are modified by reaction, such as a ray irradiation method, a reaction extrusion method, reaction crosslinking and the like, but the method has high cost and low efficiency, is not suitable for industrial large-scale production and has limited application. The other method is blending modification of polypropylene and other high melt strength polymers, and although the method is simple to operate, the improvement degree of the high melt strength depends on the matching of material systems. The patent CN103834102B utilizes high density polyethylene to improve the melt strength, but the compatibility with the system is poor, and a compatilizer is additionally added to compensate the problem of reduced mechanical properties caused by the improvement of the melt strength. Moreover, high melt polymers such as polyolefin elastomers, high melt strength polypropylene, polyethylene, and the like are expensive, which increases raw material costs. In addition, the non-environment-friendly polymers such as fluoride added in the blending modification process do not meet the requirement of green processing. For example, patent CN112724508A discloses adding fluoride as interpenetrating network forming agent. Fluoride inevitably produces fluorine-containing toxic materials during melt processing, which adversely affect consumers and the material itself.
That is, in the process of improving the strength, the existing polypropylene material melt has the problems of poor compatibility with a polypropylene system, high price, low mechanical property retention rate, serious pollution in the modification process and the like.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the environment-friendly high-melt-strength polypropylene composite material with good polypropylene system compatibility, low cost, high mechanical property retention rate and high melt 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: the high melt strength polypropylene composite material comprises the following components in parts by weight: 45-90 parts of polypropylene, 5-40 parts of talcum powder, 2-12 parts of hydrogenated styrene-butadiene block copolymer and 0.5-3 parts of modifier; the modifier is one or a combination of a phthalate coupling agent, an amino silane coupling agent, an aluminum-titanium composite coupling agent, an epoxy silane coupling agent and a PP grafting modifier.
In the composite material of the invention, polypropylene can provide effective melt strength and fluidity; the talcum powder can effectively inhibit the movement of the polypropylene chain segment, increase the viscosity of the material, improve the melt strength and improve the rigidity of the polypropylene; the modifier can improve the dispersion of the talcum powder in the polypropylene matrix, improve the binding force of the talcum powder and the matrix, reduce the interface defect between powder and the matrix and improve the melt strength; more importantly, the inventors unexpectedly found that the addition of the hydrogenated styrene-butadiene block copolymer can improve the dispersion of the talcum powder in the polypropylene, improve the binding force between the talcum powder and the polypropylene, reduce the interface defect between the talcum powder and the polypropylene, improve the melt strength of a finished product, and simultaneously maintain the high mechanical strength of the finished product. The polypropylene, the talcum powder, the hydrogenated styrene-butadiene block copolymer and the modifier are used according to a specific formula to play a synergistic role, so that the prepared polypropylene composite material has high melt strength, the compatibility of the filler and a matrix is improved, the attenuation of mechanical properties is effectively avoided, the environmental pollution is reduced, and the polypropylene composite material is suitable for preparing extruded and extruded foamed plastic parts.
The content of each component is crucial in the invention, and too high or too low content of the component can adversely affect the melt strength and mechanical properties of the high melt strength polypropylene composite material. Preferably, the weight ratio of the talc powder to the hydrogenated styrene-butadiene block copolymer is (25-35): (8-10). Under the condition, the hydrogenated styrene-butadiene block copolymer can well improve the dispersion effect of the talcum powder in the polypropylene, improve the binding force of the talcum powder and the polypropylene, reduce the interface defect between the talcum powder and the polypropylene, improve the melt strength of a finished product, and simultaneously keep the high mechanical strength of the finished product.
Preferably, the polypropylene has a melt mass flow rate of 0.3 to 2g/10min, measured according to ISO1133-2011 at 210 ℃ under a load of 2.16 kg. After a great deal of creative experimental research, the inventor of the application finds that the melt mass flow rate of the polypropylene is in the preferable range of the invention, and the high melt strength polypropylene composite material prepared by the method can be ensured to have higher melt strength and fluidity.
Preferably, the hydrogenated styrene-butadiene block copolymer has a melt mass flow rate of 18 to 25g/10min, measured according to ISO1133-2011 at 230 ℃ under a 5.0kg load. After a large amount of creative tests and researches, the inventor of the application discovers that the melt mass flow rate of the hydrogenated styrene-butadiene block copolymer in the preferable range of the invention can ensure that the prepared high-melt-strength polypropylene composite material has good fluidity and processability, and simultaneously can improve the system compatibility and reduce the interface defect between the talcum powder filler and the polypropylene matrix.
Preferably, the polypropylene is homo-polypropylene and/or co-polypropylene; the average particle size of the talcum powder is 800-5000 meshes.
More preferably, the average particle size of the talcum powder is 1000-3000 meshes. The talc powder has an excessively small particle size, and the movement of a polypropylene chain segment is not limited enough; the talc powder has an excessively high particle size, and the stronger the shearing action generated in the processing process, the more serious the chain scission of polypropylene, which in turn may result in a decrease in melt strength of the finished product.
Preferably, the high melt strength polypropylene composite material further comprises 0-1 part of an auxiliary agent, wherein the auxiliary agent comprises one or more of a lubricant and an antioxidant.
Preferably, the lubricant is used in an amount of 0-0.5 parts, and comprises at least one of stearamide, metal stearate and silicone lubricant; the using amount of the antioxidant is 0-0.5 part, and the antioxidant comprises hindered phenol antioxidant and/or phosphite antioxidant.
The invention also provides a preparation method of the high melt strength polypropylene composite material, which comprises the following steps:
(1) mixing talcum powder, hydrogenated styrene-butadiene block copolymer and modifier in a mixer to obtain a mixture A;
(2) adding the mixture A, polypropylene and an auxiliary agent into a mixer for mixing to obtain a mixture B;
(3) and adding the mixture B into a double-screw extruder for melt extrusion, and granulating and cooling to obtain the high-melt-strength polypropylene composite material.
The invention compounds talcum powder, hydrogenated styrene-butadiene block copolymer and modifier to prepare modified talcum powder filler, and then performs blending extrusion, granulation and cooling on the talcum powder filler and other components to prepare the polypropylene material. The talcum powder increases the viscosity of the material; the modifier improves the dispersibility of the talcum powder and the interface combination of the polypropylene, and reduces the interface defect; the hydrogenated styrene-butadiene block copolymer further improves the compatibility of the talcum powder and the polypropylene matrix. The prepared polypropylene material has higher melt strength and mechanical property, can be used for the processing processes of extrusion, extrusion foaming and the like, and can realize the weight reduction effect of up to 30 percent after being mixed with a foaming agent and subjected to melt extrusion.
Correspondingly, the invention also provides application of the high melt strength polypropylene composite material in preparation of extruded foamed plastic parts.
Correspondingly, the invention also provides an extruded foaming plastic part, which is obtained by mixing the high melt strength polypropylene composite material with the foaming agent and then carrying out melt extrusion. Preferably, the high-melt-strength polypropylene composite material and a foaming agent are mixed according to the weight ratio of 95-105: 1, and a foamed plastic part is obtained after melt extrusion, and the obtained extruded foamed plastic part has a good weight reduction effect.
Compared with the prior art, the invention has the beneficial effects that: the high melt strength polypropylene composite material prepared according to the formula provided by the invention has the advantages of good system compatibility, low cost, high mechanical property retention rate and high melt strength, and is suitable for preparing extruded and extruded foamed plastic parts. Meanwhile, the invention also provides an extruded foamed plastic part, which is obtained by mixing the high-melt-strength polypropylene composite material with a foaming agent and then carrying out melt extrusion, and the obtained extruded foamed plastic part has a good weight reduction effect.
Detailed Description
The technical solutions of the present invention will be further described with reference to the following embodiments, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The starting materials used in the examples and comparative examples were commercially available, and the same species was used in the parallel experiments.
The sources of the raw materials are as follows, but are not limited to these raw materials:
polypropylene:
random copolymer polypropylene, type: PP4220, manufacturer: china Yanshan petrochemical, the melt mass flow rate measured according to ISO1133-2011 under the conditions of 210 ℃ and 2.16kg load is 0.3g/10 min;
homo-polypropylene, type: PP B1101, manufacturer: taiwan, wherein the melt mass flow rate measured according to ISO1133-2011 under the conditions of 210 ℃ and 2.16kg load is 0.7g/10 min;
homo-polypropylene, type: PP140HMS, manufacturer: northern Europe chemical industry, the melt mass flow rate measured according to ISO1133-2011 under the conditions of 210 ℃ and 2.16kg load is 2.0g/10 min;
homo-polypropylene, type: PPPPPPH-T03, manufacturer: the melt mass flow rate of the Chinese Zhenhai refining is 3g/10min measured according to ISO1133-2011 under the conditions of 210 ℃ and 2.16kg load;
talc powder:
the model is as follows: t01, manufacturer: chinese Dandongtian Tianci, particle size is 1000 meshes
The model is as follows: TY90-13-C, manufacturer: three to 1250 meshes of Dongguan in China;
the model is as follows: TYT-777A, manufacturer: the particle size of the Chinese Liaoning Beihai is 3000 meshes;
modifying agent:
aminosilane coupling agent, type: JH-A110, manufacturer: fine chemical engineering of China Jianghhan;
phthalate ester coupling agent, type: TMC 931, manufacturer: china manufacturers Yangzhou Liuda;
the aluminum-titanium composite coupling agent has the following model: HW-133, manufacturer: china zhongjie new materials;
epoxy silane coupling agent, type: KH-560, manufacturer: work in Chen of Nanjing, China;
PP grafting modifier, type: PC-1, manufacturer: polymer material of south China Foshan Selaginella moellendorfii hieron.
Hydrogenated styrene-butadiene block copolymer:
the model is as follows: SEBS 1657, manufacturer: kraton Polymers, melt mass flow rate 22 g/10min, according to ISO1133-2011 at 230 ℃ under a 5.0kg load.
The model is as follows: SEBS ATPR 2040, manufacturer: aaron Industries Corp, melt mass flow rate of 18g/10min, measured according to ISO1133-2011 at 230 ℃ under a 5.0kg load.
The model is as follows: SEBS KR13032, manufacturer: korrels B.V., melt mass flow rate of 25g/10min, measured according to ISO1133-2011 at 230 ℃ under a load of 5.0 kg.
The model is as follows: SEBS 1653, manufacturer: kraton Polymers, melt mass flow rate 28 g/10min, according to ISO1133-2011 at 230 ℃ under a 5.0kg load.
The model is as follows: SEBS 1651, manufacturer: kraton Polymers, melt mass flow rate 16 g/10min, according to ISO1133-2011 at 230 ℃ under a 5.0kg load.
Lubricant: stearic acid type lubricants, commercially available
Antioxidant: hindered phenolic antioxidant Y-001, commercially available; phosphite antioxidant Y-002, commercially available.
The formulations (parts by weight) of the high melt strength polypropylene composites of examples 1-19 are shown in Table 1:
TABLE 1
Note: in the table, "-" indicates that the component was not added.
The formulations (parts by weight) of the polypropylene composite materials of comparative examples 1 to 8 are shown in Table 2:
TABLE 2
Note: in the table, "-" indicates that the component was not added.
The polypropylene composites of examples 1 to 19 and comparative examples 1 to 8 were prepared as follows:
s1, weighing a modifier, a hydrogenated styrene-butadiene block copolymer and talcum powder, adding into a high-speed mixer, and mixing, wherein the temperature of the high-speed mixer is 100 ℃, the mixing speed is 300r/min, and the mixing time is 6 min to obtain a mixture A;
s2, weighing the polypropylene, the antioxidant and the lubricant, adding the weighed mixture and the mixture A into a high-speed mixer, wherein the mixing speed is 300r/min, and the mixing time is 5min to obtain a mixture B;
and S3, adding the mixture B into a double-screw extruder for melt extrusion, and granulating and cooling to obtain the polypropylene composite material.
Performance testing
The polypropylene composite materials of examples 1-19 and comparative examples 1-8 were subjected to performance testing, the testing method was as follows:
(1) melt strength test method: the polypropylene composite thus prepared was extruded through a die having a diameter of 3mm at 200 ℃ and 30r/min by means of a PolyLab OS-type torque rheometer, and its melt strength was measured by means of a Gottfert Rheotens.
(2) The sample strips required by the mechanical property test need to be placed in an environment with 23 ℃ and 50% humidity for 2 days and then tested. The tensile strength is tested according to the ISO 527-2-2019 standard, the bending strength is tested according to the ISO 178-2019 standard, and the impact strength of the notch of the simply supported beam is tested according to the ISO 179/1eA-2010 standard.
Calcining the prepared polypropylene composite material at 800 ℃ for 40min at 600 ℃ according to ISO 3451-2019, and testing the ash particle size by using a laser particle size analyzer, wherein the average particle size of the talcum powder in the composite material is the same as that of the raw material talcum powder.
The polypropylene composite materials of examples 1 to 19 and comparative examples 1 to 8 were mixed with a blowing agent at a weight ratio of 99.5:1, and then fed into a 40:1 single-screw extruder, followed by extrusion at 190-. The density of the extruded bars was measured according to ISO 1183 and compared with composites without added foaming agent, and the weight loss ratio was calculated according to the formula (1-density after foaming/density before foaming) × 100%.
The melt strength, mechanical properties and weight reduction properties of the polypropylene composites of examples 1 to 19 and comparative examples 1 to 8 are shown in Table 3.
TABLE 3
Analysis of results
As can be seen by comparing examples 1-14 and comparative examples 1-8: the polypropylene, the talcum powder, the hydrogenated styrene-butadiene block copolymer and the modifier can play a synergistic role under the condition of the specific formula provided by the invention, so that the prepared polypropylene composite material has good melt strength and mechanical property, is particularly suitable for preparing extrusion foaming plastic parts, and has obvious weight reduction effect.
Further, comparing example 3 with comparative example 3, it can be seen that: after the hydrogenated styrene-butadiene block copolymer is added, the melt strength and the mechanical property of the polypropylene composite material are obviously improved, the weight reduction effect of the obtained extruded foamed plastic part is obvious, and the synergistic effect of the polypropylene, the talcum powder, the hydrogenated styrene-butadiene block copolymer and the modifier in a specific formula is verified again, so that the prepared polypropylene composite material has high melt strength, the compatibility of the filler and a matrix is improved, and the attenuation of the mechanical property is effectively avoided.
Moreover, as can be seen from comparison of example 3 and comparative examples 3 to 4, when the amount of the hydrogenated styrene-butadiene block copolymer added is within the range of 2 to 12 parts, a polypropylene composite material having both melt strength and mechanical properties can be obtained, and when the amount of the hydrogenated styrene-butadiene block copolymer added in comparative example 4 is too high, the melt strength and mechanical properties of the polypropylene composite material are significantly reduced, and the weight reduction effect of the obtained extruded foamed plastic part is reduced.
Comparing example 3 with comparative example 5, it can be seen that the melt strength and mechanical strength of the finished product of comparative example 5 are significantly reduced without the addition of the modifier, and the weight reduction ratio of the extruded foamed plastic part made from the polypropylene composite material of comparative example 5 is greatly reduced. It is thus clear that the modifier has a significant influence on the properties of the finished product. Meanwhile, as can be seen from comparison between examples 3 and 9 to 11, the modifier can be one of phthalate coupling agent, amino silane coupling agent, aluminum-titanium composite coupling agent, epoxy silane coupling agent and PP grafting modifier, and the performances of the finished products obtained by using the modifiers are similar.
Comparing example 3 with comparative examples 7-8, it can be seen that comparative example 7, in which no talc was added, significantly reduced the flexural modulus, and the weight reduction ratio of the extruded foamed plastic part made from the polypropylene composite material of comparative example 7 was greatly reduced, although the melt strength and notch impact strength of the finished product were higher; comparative example 8 the addition of talc powder was excessive, the notched impact strength impact of the polypropylene composite material was reduced, and the weight reduction ratio of the extruded foamed plastic part made of the polypropylene composite material was greatly reduced. Therefore, within 10-35 parts of talcum powder of the polypropylene, the prepared high-melt-strength polypropylene composite material has high melt strength and fluidity, and an extruded foamed plastic part prepared from the high-melt-strength polypropylene composite material has a good weight reduction effect.
In addition, comparing example 3, examples 15 to 16 and examples 12 to 13, it can be seen that: the melt mass flow rate of the hydrogenated styrene-butadiene block copolymer in the preferred range of the invention can ensure that the prepared high melt strength polypropylene composite material has good rigidity and mechanical property, and simultaneously, the system compatibility can be improved, and the interface defect between the talcum powder filler and the polypropylene matrix is reduced. The melt mass flow rate of the hydrogenated styrene-butadiene block copolymer described in example 12 exceeds 25g/10min, which results in too large a difference in flowability with the polypropylene matrix, resulting in reduced compatibility with the system, and increased interfacial defects between the talc filler and the polypropylene matrix; the melt mass flow rate of the hydrogenated styrene-butadiene block copolymer described in example 13, which is lower than 18g/10min, results in too great a difference in flowability with the polypropylene matrix, resulting in a reduced compatibility with the system, and an increase in interfacial defects between the talc filler and the polypropylene matrix.
Comparative examples 3, 6 to 7, and 14 show that: the melt mass flow rate of the polypropylene raw material in example 3 was 0.7g/10min, the melt mass flow rate of the polypropylene in example 6 was 0.3g/10min, the melt mass flow rate of the polypropylene in example 7 was 2g/10min, and the melt mass flow rate of the polypropylene in example 14 was 3g/10 min. After a great deal of creative test researches, the inventor of the application finds that the melt mass flow rate of the polypropylene is within 0.3-2g/10min, and the prepared high-melt-strength polypropylene composite material has high melt strength and fluidity. The melt mass flow rate of the polypropylene in example 14 was out of range, resulting in a greatly reduced melt strength of the resulting polypropylene composite.
As can be seen by comparing examples 17 to 19, the weight ratio of the talc powder to the hydrogenated styrene-butadiene block copolymer in examples 17 and 18 was (25 to 35): (8-10). The weight ratio of talc to hydrogenated styrene-butadiene block copolymer described in example 19 was 5:1, excluding (25-35): (8-10), and according to the test results, the weight ratio of the talcum powder to the hydrogenated styrene-butadiene block copolymer is (25-35): (8-10), the hydrogenated styrene-butadiene block copolymer can well improve the dispersion effect of the talcum powder in the polypropylene, improve the binding force of the talcum powder and the polypropylene, and reduce the interface defect between the talcum powder and the polypropylene, so that the melt strength of a finished product is improved, and the finished product has higher mechanical strength.
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 is 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 (10)
1. The high melt strength polypropylene composite material is characterized by comprising the following components in parts by weight: 45-90 parts of polypropylene, 5-40 parts of talcum powder, 2-12 parts of hydrogenated styrene-butadiene block copolymer and 0.5-3 parts of modifier; the modifier is one or a combination of a phthalate coupling agent, an amino silane coupling agent, an aluminum-titanium composite coupling agent, an epoxy silane coupling agent and a PP grafting modifier.
2. The high melt strength polypropylene composite of claim 1, wherein the talc powder and hydrogenated styrene-butadiene block copolymer are present in a weight ratio of (25-35): (8-10).
3. The high melt strength polypropylene composite of claim 1, wherein the polypropylene has a melt mass flow rate of 0.3 to 2g/10min, as measured according to ISO1133-2011 at 210 ℃ under a 2.16kg load.
4. The high melt strength polypropylene composite of claim 1, wherein the hydrogenated styrene-butadiene block copolymer has a melt mass flow rate of 18 to 25g/10min, as measured according to ISO1133-2011 at 230 ℃ under a 5.0kg load.
5. The high melt strength polypropylene composite of claim 1, wherein the polypropylene is a homo-polypropylene and/or a co-polypropylene;
the average particle size of the talcum powder is 800-5000 meshes.
6. The high melt strength polypropylene composite of claim 1, further comprising 0 to 1 part of an auxiliary agent, wherein the auxiliary agent comprises one or more of a lubricant and an antioxidant.
7. The high melt strength polypropylene composite according to claim 6, wherein the lubricant is used in an amount of 0 to 0.5 parts and comprises at least one of stearamides, metal salts of stearic acid, and silicone-based lubricants;
the dosage of the antioxidant is 0-0.5 part, and the antioxidant comprises hindered phenol antioxidant and/or phosphite antioxidant.
8. The method for preparing a high melt strength polypropylene composite material according to any one of claims 1 to 7, comprising the steps of:
(1) mixing talcum powder, hydrogenated styrene-butadiene block copolymer and modifier in a mixer to obtain a mixture A;
(2) adding the mixture A, polypropylene and an auxiliary agent into a mixer for mixing to obtain a mixture B;
(3) and adding the mixture B into a double-screw extruder for melt extrusion, and granulating and cooling to obtain the high-melt-strength polypropylene composite material.
9. Use of a high melt strength polypropylene composite as claimed in any one of claims 1 to 7 in the manufacture of extruded foamed plastic parts.
10. An extruded foamed plastic part, which is prepared by mixing the high melt strength polypropylene composite material as claimed in any one of claims 1 to 7 with a foaming agent and then performing melt extrusion.
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| CN116656051A (en) * | 2023-05-31 | 2023-08-29 | 广东丙辛新材料有限公司 | Foaming polypropylene material for bumper energy absorption block and preparation method thereof |
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| CN115232396A (en) * | 2022-07-12 | 2022-10-25 | 广州汽车集团股份有限公司 | Polypropylene composite material, automobile air pipe and preparation method thereof |
| CN116656051A (en) * | 2023-05-31 | 2023-08-29 | 广东丙辛新材料有限公司 | Foaming polypropylene material for bumper energy absorption block and preparation method thereof |
| CN116656051B (en) * | 2023-05-31 | 2024-02-23 | 广东丙辛新材料有限公司 | Foaming polypropylene material for bumper energy absorption block and preparation method thereof |
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