CN111004437A - Preparation method of enhanced polypropylene and extruder - Google Patents
Preparation method of enhanced polypropylene and extruder Download PDFInfo
- Publication number
- CN111004437A CN111004437A CN201911090176.XA CN201911090176A CN111004437A CN 111004437 A CN111004437 A CN 111004437A CN 201911090176 A CN201911090176 A CN 201911090176A CN 111004437 A CN111004437 A CN 111004437A
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- China
- Prior art keywords
- polypropylene
- extruder
- reinforced polypropylene
- pelletizing
- glass fiber
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
- C08J5/06—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials
- C08J5/08—Reinforcing macromolecular compounds with loose or coherent fibrous material using pretreated fibrous materials glass fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/14—Glass
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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
- C08K9/00—Use of pretreated ingredients
- C08K9/10—Encapsulated ingredients
Abstract
The invention provides a preparation method of enhanced polypropylene and an extruder, wherein the preparation method comprises the following steps: coating a plastic melt on the surface of an inorganic material to form a first melt; cooling the first melt to form a solid phase; pelletizing the solid phase to form the particles; mixing and pelletizing polypropylene and the pellets to form the reinforced polypropylene. The preparation method of the reinforced polypropylene can realize the uniform distribution of the glass fiber in the PP base material.
Description
Technical Field
The invention belongs to the technical field of reinforced polypropylene, and particularly relates to a preparation method of reinforced polypropylene and an extruder.
Background
Lightweight materials are widely applied in the fields of automobiles and household appliances, wherein reinforced PP (polypropylene) replaces ABS (acrylonitrile-butadiene-styrene plastic), HIPS (polystyrene plastic) and the like in many cases, and large-area requirements are required in the future. The reinforced PP material in the market has large performance difference and low strength, and the main reasons are shown in the following two aspects: (1) compatibility of glass fibers with PP substrates; (2) distribution of glass fibers in the PP matrix.
In order to overcome the defects in the prior art, a new reinforced polypropylene preparation method and extruder are needed.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for producing reinforced polypropylene and an extruder, which can at least replace the existing production method and can realize uniform distribution of glass fibers in a PP base material.
In order to achieve the above object, the present invention provides a method for preparing reinforced polypropylene, wherein the method comprises:
coating a plastic melt on the surface of an inorganic material to form a first melt;
cooling the first melt to form a solid phase;
pelletizing the solid phase to form the particles;
mixing and pelletizing polypropylene and the pellets to form the reinforced polypropylene.
The method for preparing reinforced polypropylene, wherein the inorganic material is a fiber material.
The preparation method of the reinforced polypropylene is characterized in that the fiber material is glass fiber.
The method for preparing reinforced polypropylene as described above, wherein the step of mixing the polypropylene and the pellets comprises adding the polypropylene and the pellets to a high-speed mixer to mix them for a predetermined time.
The preparation method of the reinforced polypropylene is characterized in that the preset time is 2-5 minutes.
The method for producing reinforced polypropylene as described above, wherein the step of granulating the polypropylene and the granules comprises feeding the mixed polypropylene and the granules to a twin-screw extruder for granulation.
The method for producing reinforced polypropylene as described above, wherein the pelletizing the solid phase to form the particles comprises:
the solid phase was pelletized by a standard pelletizer to form homogeneous, equal length coated glass fiber particles.
The invention also provides an extruder, wherein the extruder is used for preparing the reinforced polypropylene by using the preparation method of the reinforced polypropylene.
The extruder is characterized in that the die head of the extruder is provided with a through hole communicated with the discharge hole.
An extruder as described above, wherein the perforations are located opposite the discharge opening.
The preparation method of the reinforced polypropylene can realize the uniform distribution of the glass fiber in the PP base material while solving the compatibility between the glass fiber and the PP, and obtain the reinforced PP material with ultrahigh rigidity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for producing reinforced polypropylene provided by an embodiment of the present invention;
FIG. 2 is a front view of the die of the extruder of the present invention; and
FIG. 3 is a side cut view of the die of the extruder of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as techniques for the preparation of polypropylene, in order to provide a thorough understanding of the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known features are omitted so as not to obscure the description of the present invention with unnecessary detail.
In addition, in order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
As shown in FIG. 1, the present invention provides a method for preparing reinforced polypropylene, wherein the method comprises the following steps:
s1: coating a plastic melt on the surface of an inorganic material to form a first melt;
s2: cooling the first melt to form a solid phase;
s3: pelletizing the solid phase to form particles;
s4: the polypropylene and the granules are mixed and pelletized to form a reinforced polypropylene.
Specifically, in the step S1, the inorganic material is a fiber material, preferably, the fiber material is glass fiber, although the inorganic material may be other materials, and is not particularly limited herein.
In step S3, the step of pelletizing the solid phase to form particles includes: and granulating the solid phase by a standard granulator to form homogeneous and equal-length glass fiber coated particles, so that further blending granulation with the substrate particles can be realized, uniform dispersion is realized, the glass fiber length is retained to the maximum extent, the glass fiber length is uniform, and the ultrahigh-rigidity reinforced PP material is obtained.
In step S4, the step of mixing the polypropylene and the particles includes adding the polypropylene and the particles into a high-speed mixer to mix them for a predetermined time, for example, 2 to 5 minutes, so that they can be well mixed, and the mixing time is not particularly limited as long as the polypropylene and the particles can be well mixed.
Further, in step S4, the step of granulating the polypropylene and the granules comprises adding the mixed polypropylene and granules into a twin-screw extruder for granulation, wherein the extrusion processing temperature is 180 ℃ and 230 ℃.
The method of making the reinforced polypropylene of the present invention will now be described in detail with reference to fig. 2 to clarify the present invention, first performing the coating die design and process, specifically, the coating die: the glass fiber is ensured not to bend or turn in the die head (figure 3 is a side section view of the die head) by perforating 1 at the position of the extrusion die head, the quantity of the perforations is consistent with the quantity of the discharge holes 2, and the perforations 1 and the discharge holes 2 are in the same straight line, and the process carried out in the extruder is a conventional extrusion production process.
Secondly, a coating process: as shown in fig. 3, the polypropylene melt 3 and the glass fibers come out from the discharge hole at the same time, the polypropylene melt 3 is uniformly distributed on the surface of the glass fibers, and the pulling strips are granulated into homogeneous glass fiber coated particles with equal length after being cooled by water.
The opening position of the coating die head can be any position of the die head; the flow direction of the polypropylene melt 3 is not limited to that shown in FIG. 3.
Pretreatment of glass fiber
Melting PP (polypropylene), a compatilizer and other additives through an extruder to form a homogeneous polypropylene melt 3, pretreating glass fibers according to the coating die head and the process, coating a layer of PP on the surface of the glass fibers, cutting the glass fibers into homogeneous glass fiber particles coated with equal length (the effective fiber content is more than 90%) through a granulator, wherein the homogeneous glass fiber particles coated with equal length are cut through a standard granulator, and the corresponding length can be adjusted by adjusting the distance between cutters.
An embodiment will be described to illustrate the effect of the method for producing reinforced polypropylene according to the present invention.
Specifically, taking PP-GF30 as an example (not limited to 30% fiber), the glass fiber pretreatment process, the conventional direct continuous long glass fiber process and the conventional short fiber production process are adopted for carrying out performance comparison according to the same formula, and the tensile strength, the bending strength, the notch impact strength and the heat distortion temperature are used as evaluation indexes.
Example 1: glass fiber pretreatment process experimental scheme. Treating the glass fiber by the pretreatment process to obtain homogeneous glass fiber particles with the content of more than 90 percent and the same length; and proportionally adding the polypropylene and the pretreated glass fiber particles into a high-speed mixer to mix for 2-5 minutes, and then carrying out secondary granulation by a double-screw extruder, wherein the extrusion processing temperature is 180-230 ℃.
Example 2: a direct continuous long glass fiber process experimental scheme. Adding polypropylene and other auxiliary materials into a high-speed mixer for mixing for 2-5 minutes, then granulating by a double-screw extruder, directly adding continuous long fibers from a fiber adding port, and extruding at the processing temperature of 180-.
Example 3: short fiber production process experimental scheme. Adding polypropylene and other auxiliary materials into a high-speed mixer for mixing for 2-5 minutes, then granulating by a double-screw extruder, adding short fibers by adopting forced side feeding equipment in proportion, and extruding and processing at the temperature of 180-.
4. Results testing
And (3) injection molding the particles obtained by modified granulation in an injection molding machine at the temperature of 190-230 ℃ to form tensile, bending and impact sample strips, and carrying out performance test on the sample strips according to the national standard. The test specimens were placed in an environment of (23. + -. 2) ℃ and humidity (50. + -. 10%) for 88h before testing.
Tensile bar size:
| length (mm) | Width (mm) | Thickness (mm) |
| 150±2 | 10±0.2 | 4±0.2 |
Bending spline size:
| length (mm) | Width (mm) | Thickness (mm) |
| 80±2 | 10±0.2 | 4±0.2 |
Impact spline size:
| length (mm) | Width (mm) | Thickness (mm) | Gap residual width (mm) |
| 80±2 | 10±0.2 | 4±0.2 | 8±0.2 |
Heat distortion spline size:
| length (mm) | Width (mm) | Thickness (mm) |
| 80±2 | 10±0.2 | 4±0.2 |
The test results are shown in Table 1
TABLE 1 test results
In the examples, the specific refinement and content selection of each component are not limited, and those skilled in the art can make the selection according to the disclosure of the invention.
From the analysis of the test results, it can be seen that:
compared with the examples 2 and 3, the performance of the example 1 is greatly improved, especially the impact performance is greatly improved, compared with the example 2, the example 1 is improved by 33.8 percent, and compared with the example 3, the impact performance is improved by 22 percent; next, the rigidity of example 1 has reached the performance of the LFT long fiber ultra-rigid material, and can be used in various fields instead of the LFT long fiber ultra-rigid material. The glass fiber is pretreated, so that the glass fiber is uniform in length, and during secondary granulation, the mixture among particles is more uniform, and the product has a good dispersion effect; secondly, various additives are added during pretreatment, and the content of polypropylene is low (more than 90 percent of fiber), so that the content of the additives in the polypropylene melt is up to more than 50 percent, the surface treatment and activation effects on the glass fiber are excellent, and the bonding property between the base material and the glass fiber is further improved by performing secondary activation and compatibilization during secondary granulation. Therefore, the overall performance of the material is greatly improved, and the super-rigid reinforced PP material is obtained.
The invention adopts a substrate coating process to pretreat glass fibers, and the glass fibers are cut into homogeneous glass fiber coated particles with equal length; and further blending and granulating with the base material particles to realize uniform dispersion, keeping the glass fiber length to the maximum extent, and obtaining the ultrahigh-rigidity reinforced PP material, wherein the glass fiber length is uniform.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A preparation method of reinforced polypropylene is characterized by comprising the following steps:
coating a plastic melt on the surface of an inorganic material to form a first melt;
cooling the first melt to form a solid phase;
pelletizing the solid phase to form particles;
mixing and pelletizing polypropylene and the pellets to form the reinforced polypropylene.
2. The method of claim 1, wherein the inorganic material is a fibrous material.
3. The method of claim 2 wherein the fiber material is glass fiber.
4. The method of claim 1, wherein the step of mixing the polypropylene and the pellets comprises adding the polypropylene and the pellets to a high speed mixer and mixing for a predetermined time.
5. The method for preparing the reinforced polypropylene according to claim 4, wherein the predetermined time is 2 to 5 minutes.
6. The method of producing the reinforced polypropylene of claim 4, wherein the step of pelletizing the polypropylene and the pellets comprises feeding the mixed polypropylene and pellets to a twin screw extruder for pelletizing.
7. The method of producing reinforced polypropylene according to claim 3, wherein the pelletizing the solid phase to form the particles comprises:
the solid phase was pelletized by a standard pelletizer to form homogeneous, equal length coated glass fiber particles.
8. An extruder for producing a reinforced polypropylene by using the method of producing a reinforced polypropylene according to any one of claims 1 to 7.
9. The extruder of claim 8, wherein the die head of the extruder is perforated in communication with the discharge opening.
10. The extruder of claim 9 wherein the perforations are disposed opposite the discharge opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090176.XA CN111004437A (en) | 2019-11-08 | 2019-11-08 | Preparation method of enhanced polypropylene and extruder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911090176.XA CN111004437A (en) | 2019-11-08 | 2019-11-08 | Preparation method of enhanced polypropylene and extruder |
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| CN111004437A true CN111004437A (en) | 2020-04-14 |
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| CN201911090176.XA Pending CN111004437A (en) | 2019-11-08 | 2019-11-08 | Preparation method of enhanced polypropylene and extruder |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1439327A (en) * | 1972-06-28 | 1976-06-16 | Nat Res Dev | Pelletised fibres |
| EP0663418A1 (en) * | 1993-12-28 | 1995-07-19 | Kawasaki Steel Corporation | Mixture of long glass fiber-reinforced polypropylene and polypropylene resin and moldings formed therefrom |
| CN1211212A (en) * | 1996-02-16 | 1999-03-17 | 出光石油化学株式会社 | Method of forming a light-weight, fiber-reinforced thermoplastic resin product and a light-weight molded product |
-
2019
- 2019-11-08 CN CN201911090176.XA patent/CN111004437A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1439327A (en) * | 1972-06-28 | 1976-06-16 | Nat Res Dev | Pelletised fibres |
| EP0663418A1 (en) * | 1993-12-28 | 1995-07-19 | Kawasaki Steel Corporation | Mixture of long glass fiber-reinforced polypropylene and polypropylene resin and moldings formed therefrom |
| CN1211212A (en) * | 1996-02-16 | 1999-03-17 | 出光石油化学株式会社 | Method of forming a light-weight, fiber-reinforced thermoplastic resin product and a light-weight molded product |
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Application publication date: 20200414 |