CN114044980A - Preparation method of polypropylene and polyethylene graft modified high-impact polymer - Google Patents
Preparation method of polypropylene and polyethylene graft modified high-impact polymer Download PDFInfo
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- CN114044980A CN114044980A CN202111402501.9A CN202111402501A CN114044980A CN 114044980 A CN114044980 A CN 114044980A CN 202111402501 A CN202111402501 A CN 202111402501A CN 114044980 A CN114044980 A CN 114044980A
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- polypropylene
- screw extruder
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- polyethylene
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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
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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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
- C08J2323/14—Copolymers of propene
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
-
- 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
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a preparation method of a polypropylene and polyethylene graft modified high-impact polymer, relates to a polymer preparation method, and provides a preparation method of a blend for improving the impact strength of a random copolymerization polypropylene (PPR) composite material, which comprises the following steps: 1. blending the PPR, polypropylene and polyethylene graft modified polymer on a screw extruder to prepare master batches; 2. and (3) uniformly mixing the master batch obtained in the step (1) with the rest PPR, and then carrying out secondary melt blending by using a screw extruder to obtain the composite material with high impact performance. The impact strength of the blend is improved by about 2 times compared to PPR. The invention can effectively improve the mechanical property (impact strength) of PPR, provides an improved idea for toughening the PPR, and plays a promoting role in the application field of improving the PPR.
Description
Technical Field
The invention relates to a preparation method of a polymer, in particular to a preparation method of a high-impact polymer modified by grafting polypropylene and polyethylene.
Background
PP is one of the most commonly used engineering plastics and is widely used in life, for example: plumbing, furniture, appliances, toys, tableware, and the like. The addition of small amounts of ethylene (about 3-7 wt%) to PP to form random copolymer polypropylene (PPR) has replaced conventional PP as the primary material for many applications such as water pipes. A small amount of added PE acts as a diluting force in a high molecular chain segment, so that the mechanical property of PP is improved, and the toughness of PP is increased. Therefore, increasing the content of the force impact mitigating substance in the PP is a key to further improve the mechanical properties of the PP.
The invention patent application of patent number CN 200810219301 discloses a PPR/CaCO3 nano composite material and a preparation method thereof, the method prepares the PPR/CaCO3 nano composite material by in-situ compounding of a catalyst in the process of propylene/ethylene copolymerization, not only has simple preparation process, but also has low raw material cost, can fully play the reinforcing and toughening effects of the CaCO3 nano particles, and well realizes the organic combination of the rigidity, the dimensional stability and the thermal stability of the CaCO3 nano particles, the toughness and the processability of PPR, thereby improving the low-temperature impact resistance of the special material for PPR, improving the processing performance of the special material for PPR, and solving the problems of distortion and deformation of the PPR pipe caused by overlarge expansion or shrinkage in the installation construction and use processes. However, the added CaCO3 belongs to a small-molecule additive and can be precipitated on the surface in a large amount in the use process, so that the mechanical property is reduced.
The invention patent application of patent number CN201010536992.1 discloses a PPR/EVOH/POE blending composite material for improving impact resistance and permeation resistance and a manufacturing method thereof, and adopts a PP-g-MAH nucleating agent to compatibilize a blending system so as to solve the problems of low-temperature brittleness, oxygen resistance, permeability resistance, corrosion resistance, aging resistance, heat resistance, processability and the like of the PPR pipe. The performance is as follows: the tensile yield pressure is 48MPa, and the impact strength of the simply supported beam is 3.6 KJ/m. But the mechanical property is not obviously increased, and the use requirement cannot be met.
Disclosure of Invention
The invention aims to provide a preparation method of a high-impact polymer grafted and modified by polypropylene and polyethylene. The method uses the PPR to add the PE and the PP in the polymerization process for graft modification polymerization, and connects the PE to a PP molecular chain, thereby increasing the content of the PE in the PP, improving the mechanical property of the PP, leading the used material to have better compatibility with the PP, having lower cost, having no problems of micromolecules precipitation and the like, greatly improving the mechanical property, simultaneously having simple operation steps, and having wide prospect for industrial mass production.
The purpose of the invention is realized by the following technical scheme:
a preparation method of a high-impact polymer grafted and modified by polypropylene and polyethylene comprises the following preparation processes:
(1) the PPR, the graft polymer of polyethylene and the graft polymer of polypropylene are evenly mixed and added into a screw extruder for master batch preparation, and the master batch is prepared from the following raw materials:
50-100 parts of random copolymerized polypropylene (PPR);
0-25 parts of graft modified polymer of polyethylene;
0-25 parts of a graft modified polymer of polypropylene;
setting the heating temperature of the screw extruder at 160-;
(2) uniformly mixing the master batch prepared in the step (1) with the rest PPR alkene, and adding the mixture into a screw extruder to prepare a raw material; the screw extruder is set with the heating temperature of 160-.
A preparation method of a high-impact polymer grafted and modified by polypropylene and polyethylene comprises the following preparation processes:
(1) the PPR, the graft polymer of polyethylene and the graft polymer of polypropylene are evenly mixed and added into a screw extruder for master batch preparation, and the master batch is prepared from the following raw materials:
50-100 parts of random copolymerized polypropylene (PPR);
0-25 parts of graft modified polymer of polyethylene;
0-25 parts of a graft modified polymer of polypropylene;
uniformly mixing a polyethylene graft modified polymer, a polypropylene graft modified polymer and PPR, adding the mixture into a screw extruder for master batch preparation, setting the heating temperature of the screw extruder at 190 ℃ and the rotating speed of the screw extruder at 60-90 r/min, taking materials, cutting the materials, and drying for later use;
(2) and (2) mixing the master batch prepared in the step (1) with the dried PPR copolymer, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 160-180 ℃, setting the rotating speed at 50-80 r/min, cutting and drying for later use.
The preparation method of the polypropylene and polyethylene graft modified high-impact polymer is characterized in that the graft modification product of the polyethylene is one or more of maleic anhydride, acrylic ester and diallyl bisphenol A.
The preparation method of the polypropylene and polyethylene graft modified high-impact polymer comprises the step of preparing a graft modification product of polypropylene, wherein the graft modification product of polypropylene is one or more of maleic anhydride, acrylic ester and diallyl bisphenol A.
The preparation method of the polypropylene and polyethylene graft modified high-impact polymer is characterized in that the screw extruder is a single-screw extruder or a double-screw extruder.
The invention has the advantages and effects that:
the modified material adopted by the invention is a graft modified polymer of polypropylene and polyethylene, PPR is PP essentially, therefore, the compatibility of the graft modified polymer of polypropylene and PPR is good, and the graft modified polymer of polyethylene and the graft modified polymer of polypropylene belong to a graft polymer, therefore, the compatibility of polyethylene and polypropylene is increased, a good phase interface is formed, PE has higher glass transition temperature and higher impact resistance even at low temperature, therefore, the problem of incompatibility of PP and PE can be effectively improved by adding the graft PP and the PE polymer into PPR, the mechanical property of PP is greatly increased, and the application field of PP is expanded.
Detailed Description
The present invention will be described in detail with reference to examples; the present invention reflects the properties of the blend through mechanical tensile testing and is not limited by these examples.
Source of raw materials
Random copolymerized polypropylene, PPR (503), chinese petrochemical production; graft-modified polymers of polypropylene, graft-modified polymers of polyethylene, available from Yoshiko corporation.
Performance testing
And (3) testing impact strength, wherein a notched impact spline with the thickness of 4mm is used during the test, the pendulum impact of the cantilever beam is carried out according to GB/T1843-2008 standard, and the pendulum energy is 5.5J.
Comparative example 1
100 portions of random copolymerized polypropylene (PPR)
Graft-modified polyethylene Polymer 0 part
0 part of graft modified polymer of polypropylene
Comparative example 2
50 parts of random copolymerized polypropylene (PPR)
25 parts of graft modified polyethylene polymer
25 parts of graft modified polymer of polypropylene
Example 1
100 portions of random copolymerized polypropylene (PPR)
Graft-modified polyethylene Polymer 0 part
0 part of graft modified polymer of polypropylene
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
Example 2
90 portions of random copolymerized polypropylene (PPR)
Graft modified polyethylene polymer 5 parts
5 parts of graft modified polymer of polypropylene
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a double-screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
Example 3
80 portions of random copolymerized polypropylene (PPR)
10 parts of graft modified polyethylene polymer
10 parts of graft modified polymer of polypropylene
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
Example 4
70 portions of random copolymerized polypropylene (PPR)
15 parts of graft modified polyethylene polymer
15 parts of graft modified polymer of polypropylene
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
Example 5
60 portions of random copolymerized polypropylene (PPR)
20 parts of graft modified polymer of polyethylene
20 parts of polypropylene graft modified polymer
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
Example 6
50 parts of random copolymerized polypropylene (PPR)
25 parts of graft modified polyethylene polymer
25 parts of graft modified polymer of polypropylene
The specific implementation steps are as follows:
(1) uniformly mixing the PPR, the polypropylene graft modified polymer and the polyethylene graft modified polymer according to the proportion of 50:25:25, adding the mixture into a screw extruder to prepare master batches, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, taking materials, cutting the materials, and drying the materials for later use.
(2) And (3) uniformly mixing the master batch prepared in the step (1) with the rest of the PPR, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 180 ℃ and the rotating speed of the screw extruder at 80 revolutions per minute, and taking materials.
(3) The prepared pellets were pressed into a sheet having a thickness of 2 mm by a flat vulcanizing machine, and cut into a notched sample strip having a thickness of 4mm by a cutter.
The table data shows that the impact strength in the specific embodiment is greatly improved.
Claims (5)
1. A preparation method of a high-impact polymer graft-modified by polypropylene and polyethylene is characterized by comprising the following preparation processes:
(1) the PPR, the graft polymer of polyethylene and the graft polymer of polypropylene are evenly mixed and added into a screw extruder for master batch preparation, and the master batch is prepared from the following raw materials:
50-100 parts of random copolymerized polypropylene (PPR);
0-25 parts of graft modified polymer of polyethylene;
0-25 parts of a graft modified polymer of polypropylene;
setting the heating temperature of the screw extruder at 160-;
(2) uniformly mixing the master batch prepared in the step (1) with the rest PPR alkene, and adding the mixture into a screw extruder to prepare a raw material; the screw extruder is set with the heating temperature of 160-.
2. A preparation method of a high-impact polymer graft-modified by polypropylene and polyethylene is characterized by comprising the following preparation processes:
(1) the PPR, the graft polymer of polyethylene and the graft polymer of polypropylene are evenly mixed and added into a screw extruder for master batch preparation, and the master batch is prepared from the following raw materials:
50-100 parts of random copolymerized polypropylene (PPR);
0-25 parts of graft modified polymer of polyethylene;
0-25 parts of a graft modified polymer of polypropylene;
uniformly mixing a polyethylene graft modified polymer, a polypropylene graft modified polymer and PPR, adding the mixture into a screw extruder for master batch preparation, setting the heating temperature of the screw extruder at 190 ℃ and the rotating speed of the screw extruder at 60-90 r/min, taking materials, cutting the materials, and drying for later use;
(2) and (2) mixing the master batch prepared in the step (1) with the dried PPR copolymer, adding the mixture into a screw extruder for blending, setting the heating temperature of the screw extruder at 160-180 ℃, setting the rotating speed at 50-80 r/min, cutting and drying for later use.
3. The method for preparing the high-impact polymer grafted and modified by polypropylene and polyethylene according to claim 1 or 2, wherein the grafted and modified product of polyethylene is one or more of maleic anhydride, acrylate and diallyl bisphenol A.
4. The method for preparing the high-impact polymer grafted and modified by polypropylene and polyethylene according to claim 1 or 2, wherein the graft modification product of polypropylene is one or more of maleic anhydride, acrylic ester and diallyl bisphenol A.
5. The method for preparing the high-impact polymer grafted and modified by polypropylene and polyethylene as claimed in claim 1 or 2, wherein the screw extruder is a single-screw or double-screw extruder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111402501.9A CN114044980A (en) | 2021-11-24 | 2021-11-24 | Preparation method of polypropylene and polyethylene graft modified high-impact polymer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111402501.9A CN114044980A (en) | 2021-11-24 | 2021-11-24 | Preparation method of polypropylene and polyethylene graft modified high-impact polymer |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5128410A (en) * | 1988-03-29 | 1992-07-07 | Rohm And Haas Company | Graft copolymers and blends thereof with polyolefins |
| CN104497930A (en) * | 2014-12-10 | 2015-04-08 | 上海邦中高分子材料有限公司 | Adhesive resin for reinforcing PPR aluminum plastic steady-state tube |
| CN112778651A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | PPR material with high low-temperature toughness and high flame retardance and preparation method thereof |
| CN112778652A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | PPR composite material with excellent low-temperature toughness and heat resistance and preparation method thereof |
-
2021
- 2021-11-24 CN CN202111402501.9A patent/CN114044980A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5128410A (en) * | 1988-03-29 | 1992-07-07 | Rohm And Haas Company | Graft copolymers and blends thereof with polyolefins |
| CN104497930A (en) * | 2014-12-10 | 2015-04-08 | 上海邦中高分子材料有限公司 | Adhesive resin for reinforcing PPR aluminum plastic steady-state tube |
| CN112778651A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | PPR material with high low-temperature toughness and high flame retardance and preparation method thereof |
| CN112778652A (en) * | 2020-12-25 | 2021-05-11 | 上海邦中新材料有限公司 | PPR composite material with excellent low-temperature toughness and heat resistance and preparation method thereof |
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