CN113429683A - Novel high-impact-strength polypropylene polymer and preparation method thereof - Google Patents
Novel high-impact-strength polypropylene polymer and preparation method thereof Download PDFInfo
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- CN113429683A CN113429683A CN202110794758.7A CN202110794758A CN113429683A CN 113429683 A CN113429683 A CN 113429683A CN 202110794758 A CN202110794758 A CN 202110794758A CN 113429683 A CN113429683 A CN 113429683A
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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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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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
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Abstract
The invention discloses a novel high-impact-strength polypropylene polymer, which comprises the following components in parts by weight: 100 parts of polypropylene, 3-5 parts of flax fiber, 10-15 parts of a toughening agent, 3-6 parts of hexagonal boron nitride, 2-3 parts of graphene and 1-2 parts of an antioxidant; according to the invention, on the basis of increasing the toughening agent, the graphene and the hexagonal boron nitride are added, the toughness of the whole material is improved through the matching of the graphene and the toughening agent, but the dispersibility of the graphene and other components is poor, so that the dispersion uniformity of the whole material is improved through the hexagonal boron nitride, the hexagonal boron nitride is of a hexahedral crystal structure and has a very high surface ratio, and the dispersion uniformity of mixing among all components is greatly improved.
Description
Technical Field
The invention relates to a novel high-impact-strength polypropylene polymer and a preparation method thereof.
Background
Polypropylene is called PP for short, and is a colorless, odorless, nontoxic and semitransparent solid substance; polypropylene is a thermoplastic synthetic resin with excellent performance, and is colorless translucent thermoplastic light general-purpose plastic. The polypropylene has chemical resistance, heat resistance, electrical insulation, high-strength mechanical property, good high-wear-resistance processing property and the like, so that the polypropylene can be rapidly and widely developed and applied in a plurality of fields such as machinery, automobiles, electronic and electric appliances, buildings, textiles, packaging, agriculture, forestry, fishery, food industry and the like since the coming out. In recent years, with the rapid development of the industries such as packaging, electronics, automobiles and the like in China, the development of the industries in China is greatly promoted. And because of its plasticity, polypropylene materials are gradually replacing wooden products, and the mechanical functions of metals have been gradually replaced by high strength toughness and high wear resistance. In addition, polypropylene has good grafting and compounding functions, and has huge application space in the aspects of concrete, textile, packaging and agriculture, forestry and fisheries, but in some applications, the toughness of the polypropylene polymer needs to be improved, so that the application range of the polypropylene polymer is wider.
Disclosure of Invention
Aiming at the defects of the prior art, the invention solves the problems that: a novel high impact strength polypropylene polymer having improved toughness and a method for preparing the same are provided.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a novel high impact strength polypropylene polymer comprises the following components in parts by weight: 100 parts of polypropylene, 3-5 parts of flax fiber, 10-15 parts of a toughening agent, 3-6 parts of hexagonal boron nitride, 2-3 parts of graphene and 1-2 parts of an antioxidant.
Further, the composition comprises the following components in parts by weight: 100 parts of polypropylene, 3 parts of flax fiber, 12 parts of a toughening agent, 6 parts of hexagonal boron nitride, 3 parts of graphene and 1 part of an antioxidant.
Further, the polypropylene is random copolymer polypropylene.
Further, the toughening agent is selected from a two-layer core-shell structure toughening agent or a three-layer core-shell structure toughening agent; the grain size of the toughening agent is 120-125 nm.
Further, the antioxidant is a phosphite antioxidant.
A preparation method of a novel high impact strength polypropylene polymer comprises the following steps:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture;
and S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare the novel high-impact-strength polypropylene polymer.
Further, the mixing and stirring time in the step S2 is 5 to 10 min.
Further, in the step S3, the rotating speed of the double screws is 500-550 r/min; the processing temperature of the I-X area of the double-screw extruder is 130-140 ℃, 165-170 ℃, 175-180 ℃, 190-200 ℃, 205-210 ℃, 215-220 ℃, 225-230 ℃ and 235-240 ℃ in sequence; the temperature of the water tank is 30-60 ℃.
Further, in step S3, the temperature of the injection molding machine for injection molding is 160 to 180 ℃.
Further, the length of the flax short fiber is 0.2-0.5 cm.
The invention has the advantages of
According to the invention, on the basis of increasing the toughening agent, the graphene and the hexagonal boron nitride are added, the toughness of the whole material is improved through the matching of the graphene and the toughening agent, but the dispersibility of the graphene and other components is poor, so that the dispersion uniformity of the whole material is improved through the hexagonal boron nitride, the hexagonal boron nitride is of a hexahedral crystal structure and has a very high surface ratio, and the dispersion uniformity of mixing among all components is greatly improved.
Detailed Description
The present invention will be described in further detail below.
Example 1
A novel high impact strength polypropylene polymer comprises the following components in parts by weight: 100 parts of polypropylene, 3 parts of flax fiber, 10 parts of a toughening agent, 3 parts of hexagonal boron nitride, 2 parts of graphene and 1 part of an antioxidant; the polypropylene is random copolymerization polypropylene; the toughening agent is selected from a two-layer core-shell structure toughening agent; the grain size of the toughening agent is 120 nm. Further, the antioxidant is a phosphite antioxidant.
A preparation method of a novel high impact strength polypropylene polymer comprises the following steps:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture; mixing and stirring time is 5 min.
S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare a novel high-impact-strength polypropylene polymer; the rotating speed of the double screws is 500 r/min; the processing temperature of the I-X area of the double-screw extruder is 130 ℃, 165 ℃, 175 ℃, 190 ℃, 205 ℃, 215 ℃, 225 ℃ and 235 ℃ in sequence; the temperature of the water tank is 30 ℃; the temperature of the injection molding machine for injection molding is 160 ℃.
Example 2
A novel high impact strength polypropylene polymer comprises the following components in parts by weight: 100 parts of polypropylene, 4 parts of flax fiber, 12 parts of a toughening agent, 4 parts of hexagonal boron nitride, 3 parts of graphene and 1 part of an antioxidant; the polypropylene is random copolymerization polypropylene; the toughening agent is selected from three-layer core-shell structure toughening agents; the grain size of the toughening agent is 122 nm. Further, the antioxidant is a phosphite antioxidant.
A preparation method of a novel high impact strength polypropylene polymer comprises the following steps:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture; mixing and stirring time is 8 min.
S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare a novel high-impact-strength polypropylene polymer; the rotating speed of the double screws is 520 r/min; the processing temperature of the I-X area of the double-screw extruder is 135 ℃, 167 ℃, 177 ℃, 195 ℃, 207 ℃, 216 ℃, 227 ℃, 229 ℃, 230 ℃ and 238 ℃ in sequence; the temperature of the water tank is 40 ℃; the temperature of the injection molding machine for injection molding is 170 ℃.
Example 3
A novel high impact strength polypropylene polymer comprises the following components in parts by weight: 100 parts of polypropylene, 5 parts of flax fiber, 15 parts of a toughening agent, 6 parts of hexagonal boron nitride, 3 parts of graphene and 2 parts of an antioxidant; the polypropylene is random copolymerization polypropylene; the toughening agent is selected from a two-layer core-shell structure toughening agent; the grain size of the toughening agent is 124 nm. Further, the antioxidant is a phosphite antioxidant.
A preparation method of a novel high impact strength polypropylene polymer comprises the following steps:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture; mixing and stirring time is 10 min.
S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare a novel high-impact-strength polypropylene polymer; the rotating speed of the double screws is 550 r/min; the processing temperature of the I-X area of the double-screw extruder is 140 ℃, 170 ℃, 180 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 240 ℃ in sequence; the temperature of the water tank is 50 ℃; the temperature of the injection molding machine for injection molding is 180 ℃.
Example 4
A novel high impact strength polypropylene polymer comprises the following components in parts by weight: 100 parts of polypropylene, 3 parts of flax fiber, 12 parts of a toughening agent, 6 parts of hexagonal boron nitride, 3 parts of graphene and 1 part of an antioxidant; the polypropylene is random copolymerization polypropylene; the toughening agent is selected from three-layer core-shell structure toughening agents; the grain size of the toughening agent is 125 nm. Further, the antioxidant is a phosphite antioxidant.
A preparation method of a novel high impact strength polypropylene polymer comprises the following steps:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture; mixing and stirring time is 8 min.
S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare a novel high-impact-strength polypropylene polymer; the rotating speed of the double screws is 550 r/min; the processing temperature of the I-X area of the double-screw extruder is 140 ℃, 165 ℃, 180 ℃, 190 ℃, 205 ℃, 220 ℃, 225 ℃, 230 ℃ and 240 ℃ in sequence; the temperature of the water tank is 60 ℃; the temperature of the injection molding machine for injection molding is 180 ℃.
According to the invention, on the basis of increasing the toughening agent, the graphene and the hexagonal boron nitride are added, the toughness of the whole material is improved through the matching of the graphene and the toughening agent, but the dispersibility of the graphene and other components is poor, so that the dispersion uniformity of the whole material is improved through the hexagonal boron nitride, the hexagonal boron nitride is of a hexahedral crystal structure and has a very high surface ratio, and the dispersion uniformity of mixing among all components is greatly improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A novel high impact strength polypropylene polymer is characterized by comprising the following components in parts by weight: 100 parts of polypropylene, 3-5 parts of flax fiber, 10-15 parts of a toughening agent, 3-6 parts of hexagonal boron nitride, 2-3 parts of graphene and 1-2 parts of an antioxidant.
2. The novel high impact polypropylene polymer according to claim 1, comprising the following components in parts by weight: 100 parts of polypropylene, 3 parts of flax fiber, 12 parts of a toughening agent, 6 parts of hexagonal boron nitride, 3 parts of graphene and 1 part of an antioxidant.
3. The novel high impact polypropylene polymer according to claim 1, wherein the polypropylene is a random copolymer polypropylene.
4. The novel high impact polypropylene polymer according to claim 1, wherein the toughening agent is selected from a two-layer core-shell structure toughening agent or a three-layer core-shell structure toughening agent; the grain size of the toughening agent is 120-125 nm.
5. The novel high impact polypropylene polymer according to claim 1, wherein the antioxidant is a phosphite antioxidant.
6. A method for preparing the novel high impact strength polypropylene polymer according to claim 1, comprising the steps of:
s1, sending the flax fibers into a shearing machine for shearing to form flax short fibers;
s2, feeding the polypropylene, the flexibilizer, the hexagonal boron nitride, the graphene, the antioxidant and the flax short fibers into a high-speed mixer in proportion, and fully stirring and mixing to obtain a mixture;
and S3, feeding the mixture into a double-screw extruder, melting, extruding, cooling and granulating the mixture by the double-screw extruder, and feeding the granules into an injection molding machine for injection molding to prepare the novel high-impact-strength polypropylene polymer.
7. The method for preparing a novel high impact polypropylene polymer according to claim 6, wherein the mixing and stirring time in the step S2 is 5 to 10 min.
8. The method for preparing the novel high impact strength polypropylene polymer according to claim 6, wherein in the step S3, the rotation speed of the twin screw is 500-550 r/min; the processing temperature of the I-X area of the double-screw extruder is 130-140 ℃, 165-170 ℃, 175-180 ℃, 190-200 ℃, 205-210 ℃, 215-220 ℃, 225-230 ℃ and 235-240 ℃ in sequence; the temperature of the water tank is 30-60 ℃.
9. The method of claim 6, wherein in step S3, the injection molding temperature of the injection molding machine is 160-180 ℃.
10. The method of claim 6 wherein said staple flax fibers have a length of 0.2 to 0.5 cm.
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Cited By (1)
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