CN111117068A - Modified polypropylene composite material and preparation method thereof - Google Patents
Modified polypropylene composite material and preparation method thereof Download PDFInfo
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- CN111117068A CN111117068A CN201911408777.0A CN201911408777A CN111117068A CN 111117068 A CN111117068 A CN 111117068A CN 201911408777 A CN201911408777 A CN 201911408777A CN 111117068 A CN111117068 A CN 111117068A
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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
- 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 modified polypropylene composite material, which comprises 58-84.5 parts of pure resin granules of polypropylene, 15-40 parts of polyphenylene sulfide fiber material and 0.5-2 parts of silane coupling agent in raw material and auxiliary material ratio, wherein the polypropylene composite material is composite granules formed by uniformly mixing raw materials and auxiliary materials. Synchronously feeding by using a double-screw extruder to convey a main feeding port and a side feeding port which are distributed forwards and backwards along a screw, extruding and molding into a plurality of melt thin flows from a machine head screen plate after melting, dispersing and homogenizing, performing water cooling qualitative treatment, and shearing into particles by using a granulator or further performing size screening. By applying the modified polypropylene composite material and the preparation method thereof, PP is modified by PPS fiber, so that the mechanical strength is multiplied, the material specific gravity, the dielectric constant and the dielectric loss are reduced, the optimized performance provides the convenience of transportation and installation, and the requirements of multiple fields of application are met.
Description
Technical Field
The invention relates to a thermoplastic plastic modification scheme, in particular to a modified polypropylene composite material and a preparation method thereof.
Background
Polypropylene (PP) is a thermoplastic plastic produced by polymerizing a propylene monomer, belongs to one of four general plastics, and has excellent comprehensive performance and lower price. The method is widely applied to various industries such as automobiles, household appliances, electronics, textiles, buildings, medical appliances, daily necessities, equipment parts and the like. Due to the structure of the PP material, the PP material also has the defects of low strength, poor toughness, large molding shrinkage, easy aging, non-flame retardance and the like. In a specific application field, in order to meet the requirements of working conditions, modification is often needed to improve the performance of the glass fiber, and conventional modification comprises toughening, strengthening, flame retarding, antistatic, wear resisting, temperature resisting, coloring and the like, wherein the glass fiber reinforced modification is one of the most widely used and most used.
The common method for reinforcing and modifying PP is to fill glass fiber and carbon fiber, and also fill basalt fiber, mineral whisker and the like. Although the strength can be improved after modification, the method still has more obvious defects: 1. the weight of the material is increased, and the development requirement of light weight is not met; 2. the dielectric property of the material is reduced, and the reinforcing materials such as glass fiber, carbon fiber, basalt fiber and mineral whisker adopted in the prior art have higher dielectric constant and dielectric loss, so that the application of the reinforcing materials in the fields of electronics, motors, cables, communication, new energy storage and the like is limited.
Disclosure of Invention
The invention aims to provide a modified polypropylene composite material and a preparation method thereof, which aim to improve the properties of the material, such as specific gravity, mechanical strength, dielectric constant, loss and the like, which are beneficial to expanding application.
The technical solution of the present invention for achieving the above object is a modified polypropylene composite material, which is characterized in that: the polypropylene composite material is composite material particles formed by uniformly mixing 58-84.5 parts of polypropylene pure resin particles, 15-40 parts of polyphenylene sulfide fiber materials and 0.5-2 parts of silane coupling agents.
Furthermore, the polyphenylene sulfide fiber material has the size specification of 5-100 μm of diameter and 3-10 mm of length.
Further, the silane coupling agent is selected from one of KH550, KH560 and KH 570. Further, the AlN is in a lamellar form, and the component content is 20-60 parts.
The technical solution of the present invention for achieving the above another object is a preparation method of a modified polypropylene composite material, which is characterized in that: weighing polypropylene resin particles, polyphenylene sulfide fibers and a silane coupling agent according to the proportion of raw materials and auxiliary materials, conveying the materials along a screw rod by using a double-screw extruder to synchronously feed the materials to a main feeding port and a side feeding port which are distributed front and back, extruding and molding the materials into a plurality of melt trickles from a machine head screen plate after melting, dispersing and homogenizing, and then performing water cooling qualitative treatment and cutting the melt trickles into particles by using a granulator.
Furthermore, the main feeding port is positioned at the far end of the double-screw extruder opposite to the main screw of the machine head screen plate, a main feeding weightlessness scale is arranged above the main feeding port in a hanging mode, and the polypropylene resin particles are fed into the main screw from the main feeding port.
Furthermore, the side feeding ports comprise a No. 2 side feeding port far away from the machine head screen plate and a No. 1 side feeding port close to the machine head screen plate, a feeding weightlessness scale is arranged above each side feeding port in a hanging mode, the silane coupling agent is fed into the double screws from the No. 2 side feeding port, and the polyphenylene sulfide fibers are fed into the double screws from the No. 1 side feeding port.
Further, after the polypropylene composite material is sheared into particles, size screening is carried out through a reciprocating type vibrating screen.
The modified polypropylene composite material and the preparation method thereof have the following outstanding substantive characteristics and remarkable progressiveness: PP is modified through PPS fiber, so that the mechanical strength is multiplied, the material proportion, the dielectric constant and the dielectric loss are reduced, the optimized performance provides the convenience of transportation and installation, and the requirements of multi-field application are met.
Drawings
FIG. 1 is a schematic view of the structure of an apparatus for preparing a modified polypropylene composite according to the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in connection with the accompanying drawings for the purpose of understanding and controlling the technical solutions of the present invention, so as to define the protection scope of the present invention more clearly.
In the process of designing and manufacturing the thermoplastic material for a long time, designers analyze and research the defects of large modified specific gravity, insufficient mechanical strength, reduced dielectric property and the like of the conventional PP material, and develop and innovate a modified polypropylene composite material and a preparation method thereof for expanding the application of the PP material in various industries and meeting performance requirements.
The modified PP composite material is understood from the summary of the mixture ratio and composition, and the mixture ratio of the raw materials and the auxiliary materials comprises the following components in parts by weight: 58 to 84.5 portions of pure polypropylene resin particles, 15 to 40 portions of polyphenylene sulfide fiber material and 0.5 to 2 portions of silane coupling agent, and the raw materials and the auxiliary materials are uniformly mixed, melted, extruded and molded to prepare the particles of the polypropylene composite material.
Wherein the polyphenylene sulfide fiber material has the size specification of 5-100 μm diameter and 3-10 mm length. The silane coupling agent is selected from KH550, KH560 and KH 570.
On the basis of the above-mentioned raw material components, it is further understood from the summary of the preparation process of the modified PP composite as shown in fig. 1: weighing polypropylene resin particles, polyphenylene sulfide fibers and a silane coupling agent according to the proportion of raw materials and auxiliary materials, conveying the materials along a screw rod by using a double-screw extruder 7 to synchronously feed materials to a main feeding port 1 and a side feeding port which are distributed front and back, extruding and molding the materials from a machine head screen plate 8 into a plurality of melt trickles after melting, dispersing and homogenizing, performing water cooling qualitative treatment by using a water tank 9, and shearing the melt trickles into particles by using a granulator 10. Wherein the main feeding port 1 is positioned at the far end of a main screw rod of the double-screw extruder opposite to the machine head screen plate 8, a main feeding weightlessness scale 2 is suspended above the main feeding port 1, and the polypropylene resin particles are fed into the main screw rod from the main feeding port. The side feeding ports comprise a No. 2 side feeding port 3 far away from the machine head screen plate and a No. 1 side feeding port 6 near to the machine head screen plate, feeding weightlessness scales 4 and 5 are arranged above the side feeding ports in a hanging mode, the silane coupling agent is fed into the double screws from the No. 2 side feeding port 3, and the polyphenylene sulfide fibers are fed into the double screws from the No. 1 side feeding port 6.
In addition, the polypropylene composite material is sized by a reciprocating vibrating screen 11 after being sheared into particles. Namely, screening out particles with overlarge and undersize sizes, and finally obtaining the PPS fiber reinforced modified PP composite material meeting the requirements. Of course, the preparation method is not limited to the twin-screw extrusion, and the preparation method can also refer to the molding process such as LFT-D and the like for reference.
From the summary of the raw and auxiliary materials and the preparation method, the principle of improving the heat conductivity of the material can be understood as follows: according to the invention, the PPS fiber with smaller specific gravity is used as the filler to modify the PP material, so that the overall specific gravity of the modified PP finished product is reduced, and the density is reduced to 0.9-1.1 g/cm3Therefore, the lighter material is convenient to carry, and considerable transportation cost and installation cost are expected to be saved. And the PPS fiber simultaneously brings the multiplied increase of the mechanical strength of the finished product, the mechanical strength is up to 40-70 MPa, and the use requirements in the fields of automobiles, household appliances and the like are met. In addition, the dielectric constant is reduced to 2.2-3.0, the dielectric loss is 0.001-0.003, the defect of poor dielectric property of modified PP materials such as glass fiber is overcome, and the modified PP materials can be better applied to the fields of electronics, cables, communication, new energy and the like.
For a more intuitive understanding of the above-mentioned manufacturing and molding process of the modified PP composite material and the principle of the obtained technical effect, please refer to the following preferred embodiments.
The component ratio is as follows: 74 parts of polypropylene particles; polyphenylene sulfide short fiber (length 5mm, diameter 20 μm), adding 25 parts, silane coupling agent (KH 570), adding 1 part, weighing by weight loss, synchronously feeding into double screw extruderThe temperature of the screw is set to be 140-220 ℃, and the rotating speed of the screw is 300-400 rpm. The subsequent cooling and dicing will be omitted. The PPS fiber modified PP material prepared by the method has the following main properties measured by tests: density 1.02g/cm3Tensile strength of 47MPa, impact strength of 50, J/M, dielectric constant of 2.6, and dielectric loss of 0.002.
In summary, the detailed description of the embodiments of the present invention reveals the innovative essence of the technical solution of the present invention, and has many advantages that break through the current thermal insulation material: PP is modified through PPS fiber, so that the mechanical strength is multiplied, the material proportion, the dielectric constant and the dielectric loss are reduced, the optimized performance provides the convenience of transportation and installation, and the requirements of multi-field application are met.
Claims (7)
1. A modified polypropylene composite material is characterized in that: the polypropylene composite material is composite material particles formed by uniformly mixing 58-84.5 parts of polypropylene pure resin particles, 15-40 parts of polyphenylene sulfide fiber materials and 0.5-2 parts of silane coupling agents.
2. The modified polypropylene composite of claim 1, wherein: the polyphenylene sulfide fiber material has the size specification of 5-100 mu m in diameter and 3-10 mm in length.
3. The modified polypropylene composite of claim 1, wherein: the silane coupling agent is selected from one of KH550, KH560 and KH 570.
4. A preparation method of a modified polypropylene composite material is characterized by comprising the following steps: weighing polypropylene resin particles, polyphenylene sulfide fibers and a silane coupling agent according to the proportion of raw materials and auxiliary materials, conveying the materials along a screw rod by using a double-screw extruder to synchronously feed the materials to a main feeding port and a side feeding port which are distributed front and back, extruding and molding the materials into a plurality of melt trickles from a machine head screen plate after melting, dispersing and homogenizing, and then performing water cooling qualitative treatment and cutting the melt trickles into particles by using a granulator.
5. The method for preparing the modified polypropylene composite material according to claim 4, wherein: the main feeding port is positioned at the far end of the double-screw extruder opposite to the main screw of the machine head screen plate, a main feeding weightlessness scale is arranged above the main feeding port in a hanging mode, and the polypropylene resin particles are fed into the main screw from the main feeding port.
6. The method for preparing the modified polypropylene composite material according to claim 4, wherein: the side feeding ports comprise a No. 2 side feeding port far away from the machine head screen plate and a No. 1 side feeding port close to the machine head screen plate, a feeding weightlessness scale is arranged above each side feeding port in a hanging mode, the silane coupling agent is fed into the double screws from the No. 2 side feeding port, and the polyphenylene sulfide fibers are fed into the double screws from the No. 1 side feeding port.
7. The method for preparing the modified polypropylene composite material according to claim 4, wherein: after the polypropylene composite material is sheared into particles, size screening is carried out through a reciprocating type vibrating screen.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113774516A (en) * | 2021-10-11 | 2021-12-10 | 南通新帝克单丝科技股份有限公司 | Preparation method of hydrophilic polypropylene sheath-core composite monofilament |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113774516A (en) * | 2021-10-11 | 2021-12-10 | 南通新帝克单丝科技股份有限公司 | Preparation method of hydrophilic polypropylene sheath-core composite monofilament |
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Effective date of registration: 20230518 Address after: 215021 Second Floor, Complex Building 3, No. 68, Changyang Street, Suzhou Industrial Park, Suzhou, Jiangsu Province Applicant after: National Materials (Suzhou) New Material Technology Co.,Ltd. Address before: 215021 No. 68, Changyang street, Suzhou Industrial Park, Jiangsu Applicant before: SINOMA SCIENCE & TECHNOLOGY(SUZHOU) Co.,Ltd. |