CN115536934A

CN115536934A - High-strength high-toughness POE elastomer and preparation method thereof

Info

Publication number: CN115536934A
Application number: CN202211286684.7A
Authority: CN
Inventors: 王元霞; 白楠; 史颖; 刘立志; 宋立夫
Original assignee: Shenyang University of Chemical Technology
Current assignee: Shenyang University of Chemical Technology
Priority date: 2022-10-20
Filing date: 2022-10-20
Publication date: 2022-12-30

Abstract

The invention discloses a high-strength high-toughness POE (polyolefin elastomer) and a preparation method thereof, relates to a high-molecular elastic material and a preparation method thereof, and relates to an elastomer composition for improving the mechanical property of an ethylene-octene random copolymer (POE) thermoplastic elastomer material and a preparation method thereof, wherein the preparation method comprises the following steps: 1. uniformly mixing an ethylene-octene random copolymer, an ethylene-octene block copolymer, and an olefin polymer in a mass ratio of 100; 2. and (3) carrying out twice melt blending on the compounds which are uniformly mixed and have different mass ratios by adopting a double-screw extruder, and setting the processing temperature to be 180 ℃. The invention can effectively improve the mechanical properties (tensile strength and elongation at break) of POE.

Description

High-strength high-toughness POE elastomer and preparation method thereof

Technical Field

The invention relates to a high-molecular elastic material and a preparation method thereof, in particular to a high-strength high-toughness POE elastomer and a preparation method thereof.

Background

The polyolefin thermoplastic elastomer (POE) is ethylene-octene copolymer, the ethylene segment has its partial crystal destroyed owing to the introduction of octene, so that the octene segment and the destroyed part form soft segment of POE, and the ethylene without destroyed crystal forms its hard segment to act as physical cross-linking point to make POE possess the property of elastomer. Compared with the traditional Ziegler-Natta catalyst, the metallocene catalyst has ideal single active center, so that the relative molecular mass distribution, the comonomer content and the distribution of the comonomer on a main chain can be precisely controlled in the polymerization process, and the physical and mechanical properties and the processing performance of the polymer can be accurately controlled. POE with the trademark of Engage produced by INSITE technology and CGCT technology has narrow molecular weight and short branch distribution and controllable polymer structure on one hand; on the other hand, the molecular chain is saturated, and the molecular chain contains relatively few tertiary and carbon atoms, so that the alloy has excellent thermal-oxidative aging resistance and ultraviolet resistance, and has excellent mechanical property, melt strength and processability. Therefore, the method is widely applied to the fields of automobile parts, electric wires and cables and the like.

Pure POE has limited applications in some fields due to its low mechanical strength and relatively poor dimensional stability. Therefore, the addition of the second phase polymer is usually adopted to effectively change the problem of the dimensional stability of POE. On one hand, the macroscopic mechanical property of the material is increased; on the other hand, the permanent deformation of the material is reduced, and the application range of the material is increased. In the selection of blending materials, the ethylene-Octene Block Copolymer (OBC) which has similar comonomer with POE, good permanent deformation and extremely high elongation at break is selected, so that the defects of POE (large permanent deformation) are changed. But because of the low stress at definite elongation of the OBC, a polyolefin Polymer (PE) having a similar structure to the hard segment of the OBC is selected for improvement.

Disclosure of Invention

The invention aims to provide a high-strength high-toughness POE (polyolefin elastomer) and a preparation method thereof, and provides an elastomer polymer for improving the performance of a polyolefin thermoplastic elastomer material of an ethylene-octene random copolymer (POE) and a method thereof. .

The purpose of the invention is realized by the following technical scheme:

the high-strength high-toughness POE elastomer comprises the following components in parts by weight:

0-100 parts of ethylene-octene random copolymer (POE);

0-50 parts of ethylene-Octene Block Copolymer (OBC);

0-50 parts of polyolefin polymer.

The POE elastomer with high strength and high toughness comprises 50-100 parts of POE, preferably 70-100 parts of POE; in the composition, the OBC is 0-50 parts, preferably 0-30 parts; the polyolefin polymer in the composition is polyethylene, and the content is 0-50 parts, preferably 0-20 parts.

The POE elastomer with high strength and high toughness is characterized in that the POE elastomer comprises 0-30 parts of ethylene-Octene Block Copolymer (OBC), preferably 0-10 parts of OBC, and 0-20 parts of Polyethylene (PE), preferably 0-10 parts of PE.

The high-strength high-toughness POE elastomer is prepared from an ethylene-octene random copolymer (POE) which is an EnGAGE series product of Dow, an Exact and Vistamaxx series product of Exxon Mobil and a Tafmar DF series product of Mitsui, wherein the octene content is 18-30%, the average molecular weight (Mn) is 39000, and the melt index: 190. 2.16Kg at 0.5-13.0 g/min.

The POE elastomer with high strength and high toughness is characterized in that the ethylene-Octene Block Copolymer (OBC) is a Dow INFUSE TM series product, and the density: 0.866-8.77 g/cm ³ The melt index: 190. 2.16Kg at 0.5-15 g/min.

The POE elastomer with high strength and high toughness is characterized in that the Polyethylene (PE) is high-density polyethylene (HDPE), and the density: 0.935-0.954 g/cm ³ The melt index: 190. 2.16Kg,0.5-4.0 g/min.

A preparation method of a high-strength and high-toughness POE (polyolefin elastomer) comprises the following steps:

(1) Uniformly mixing ethylene-octene random copolymer, ethylene-octene block copolymer and polyethylene according to a proportion to obtain a POE thermoplastic polyolefin elastomer mixture;

(2) And (2) carrying out melt processing on the POE thermoplastic polyolefin elastomer mixed in the step (1) by using a double-screw extruder, wherein the processing temperature is 180 ℃, and the rotating speed is 250rpm.

Drawings

FIG. 1 is a graph showing the comparative results of tensile strength tests of comparative examples and examples;

FIG. 2 is a graph showing the comparative results of the elongation at break tests of the comparative examples and examples;

FIG. 3 is a graph showing the comparative results of the permanent deformation test of the comparative example and the example.

Detailed Description

The present invention will be described in detail with reference to the embodiments shown in the drawings.

Comparative example

A high-strength high-toughness POE (polyolefin elastomer) material comprises the following raw materials in percentage by mass: 100 parts of POE, 0 part of ethylene Octene Block Copolymer (OBC) and 0 part of High Density Polyethylene (HDPE).

The preparation method of the POE elastomer material with high strength and high toughness comprises the following steps:

(1) At present, the ethylene-octene random copolymer, the ethylene-octene block copolymer and the olefin polymer are uniformly mixed according to a certain proportion to obtain the POE thermoplastic polyolefin elastomer mixture.

Example 1

A high-strength high-toughness POE (polyolefin elastomer) material comprises the following raw materials in percentage by mass: 90 parts of POE, 5 parts of ethylene Octene Block Copolymer (OBC) and 5 parts of High Density Polyethylene (HDPE).

Example 2

A high-strength high-toughness POE (polyolefin elastomer) material comprises the following raw materials in percentage by mass: 80 parts of POE, 10 parts of ethylene Octene Block Copolymer (OBC) and 10 parts of High Density Polyethylene (HDPE).

Example 3

A high-strength high-toughness POE (polyolefin elastomer) material comprises the following raw materials in percentage by mass: 70 parts of POE, 15 parts of ethylene-Octene Block Copolymer (OBC) and 15 parts of high-density polyethylene (HDPE).

The above comparative examples and examples were pressed into sheets of uniform thickness by a press vulcanizer, and the results are shown in FIGS. 1 and 2. The test method comprises the following steps: and (4) determining the tensile stress strain performance of the vulcanized rubber or the thermoplastic rubber according to GB/T528-2009.

Test results

Comparing the POE modified materials prepared in the comparative example and the examples, the data show that the POE modified materials prepared in the examples have greatly improved tensile strength and elongation at break. Compared with the comparative example, the tensile strength and the elongation at break of the POE modified material prepared in example 1 are respectively improved by 43 percent and 7 percent, and the permanent deformation is reduced by 16 percent. The tensile strength and the elongation at break of the POE modified material prepared in the embodiment 2 are respectively improved by 38 percent and 10 percent, and the permanent deformation is reduced by 33 percent; the tensile strength and the elongation at break of the POE modified material prepared in the embodiment 3 are respectively improved by 32% and 13%, and the permanent deformation is reduced by 8%; the above data show that the present invention can effectively improve the tensile strength and elongation at break and permanent set of the POE thermoplastic elastomer.

Claims

1. The high-strength high-toughness POE elastomer is characterized by comprising the following components in parts by weight:

0-100 parts of ethylene-octene random copolymer (POE);

0-50 parts of ethylene-Octene Block Copolymer (OBC);

0-50 parts of polyolefin polymer.

2. The POE elastomer with high strength and high toughness as claimed in claim 1, wherein the POE in the composition is 50-100 parts, preferably 70-100 parts; in the composition, the OBC is 0-50 parts, preferably 0-30 parts; the polyolefin polymer in the composition is polyethylene, and the content is 0-50 parts, preferably 0-20 parts.

3. A POE elastomer with high strength and high toughness as claimed in claim 2, wherein said ethylene-Octene Block Copolymer (OBC) is 0-30 parts, preferably 0-10 parts, and said Polyethylene (PE) is 0-20 parts, preferably 0-10 parts.

4. The POE elastomer with high strength and high toughness of claim 1, wherein the ethylene-octene random copolymer (POE) is selected from the group consisting of Dow's ENGAGE series, exact and Vistamaxx series of Exxon Mobil and Tafmar DF series of Mitsui, and has an octene content of 18-30%, an average molecular weight (Mn) of 39000, a melt index: 190. 2.16Kg at ° C, 0.5-13.0 g/min.

5. The POE elastomer with high strength and high toughness as claimed in claim 1, wherein said ethylene-Octene Block Copolymer (OBC) is a Dow INFUSE TM series product, density: 0.866-8.77 g/cm ³ The melt index: 190. 2.16Kg at ° C, 0.5-15 g/min.

6. The POE elastomer with high strength and high toughness as claimed in claim 1, wherein the Polyethylene (PE) is High Density Polyethylene (HDPE), and the density: 0.935-0.954 g/cm ³ The melt index: 190. 2.16Kg,0.5-4.0 g/min.

7. A preparation method of a high-strength and high-toughness POE (polyolefin elastomer) comprises the following steps:

uniformly mixing ethylene-octene random copolymer, ethylene-octene block copolymer and polyethylene according to a proportion to obtain a POE thermoplastic polyolefin elastomer mixture;

and (3) carrying out melt processing on the POE thermoplastic polyolefin elastomer mixed in the step (1) by using a double-screw extruder, wherein the processing temperature is 180 ℃, and the rotating speed is 250rpm.