CN108299712B - Polyolefin thermoplastic elastomer and processing method thereof - Google Patents

Polyolefin thermoplastic elastomer and processing method thereof Download PDF

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CN108299712B
CN108299712B CN201710025135.7A CN201710025135A CN108299712B CN 108299712 B CN108299712 B CN 108299712B CN 201710025135 A CN201710025135 A CN 201710025135A CN 108299712 B CN108299712 B CN 108299712B
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thermoplastic elastomer
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antioxidant
polyolefin thermoplastic
highly branched
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CN108299712A (en
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Zhejiang University ZJU
Hangzhou Xinglu Technology Co Ltd
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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
    • C08L23/04—Homopolymers or copolymers of ethene
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • 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
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/04—Thermoplastic elastomer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/06—Properties of polyethylene
    • C08L2207/062—HDPE
    • 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
    • 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
    • C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers

Abstract

The invention relates to a polyolefin thermoplastic elastomer and a processing method thereof, wherein the polyolefin thermoplastic elastomer comprises the following components in parts by weight 100: the polyolefin thermoplastic elastomer comprises the following raw materials in parts by weight of 100: 10-50 parts of high-density polyethylene, 50-90 parts of highly branched polyethylene and 0.1-1 part of antioxidant, wherein the branching degree of the highly branched polyethylene is 70-130 branched chains/1000 carbon atoms, the weight average molecular weight is 6.6-43.6 ten thousand, and the Mooney viscosity ML (1 + 4) is 6-93 at 125 ℃. The preparation method has the beneficial effects that the production cost of the polyolefin thermoplastic elastomer can be greatly reduced by using the highly branched polyethylene to replace the elastomers such as EPDM, POE, OBC and the like, and the preparation method is suitable for large-scale industrial production.

Description

Polyolefin thermoplastic elastomer and processing method thereof
Technical Field
The invention belongs to the technical field of elastomers, and particularly relates to a polyolefin thermoplastic elastomer and a processing method thereof.
Background
Thermoplastic elastomers (TPEs) are a class of polymeric materials with physical properties intermediate between those of rubber and plastic. It has the elasticity of rubber and the easy processing property of plastics, and can be recycled, so it is known as "third generation rubber". Since heat vulcanization like rubber is not required, molding processing is simple. The final product of the plastic can be easily prepared by using a common plastic processing machine, the flow 1/4 can be shortened by only molding processing, the efficiency is improved by 10-20 times, and the energy consumption is saved by 25-40%; and the performance of the product prepared by reprocessing the TPE after recovery does not obviously lose. This is a significant advantage over traditional rubbers, which is known as a revolution in materials and process technology in the rubber industry.
Thermoplastic elastomers include mainly 6 main classes: polyolefin-based thermoplastic elastomers (TPO); styrenic thermoplastic elastomers; a polyvinyl chloride-based thermoplastic elastomer; polyurethane thermoplastic elastomers; a polyester-based thermoplastic elastomer; a polyamide-based thermoplastic elastomer. Because TPO has excellent weather resistance, ozone resistance, ultraviolet resistance and good high temperature resistance and impact resistance, can be molded by common thermoplastic plastic processing equipment and can be repeatedly used, is developed rapidly, becomes a fastest growing variety in thermoplastic elastomers, and is widely applied to the fields of automobiles, electronics, electrical engineering, industry, civil use and the like.
However, the technology for producing TPE in our country falls far behind developed countries. The main ones that can be mass-produced are the general styrene-butadiene block copolymers (SBS). Polyolefin thermoplastic elastomers (TPO) and thermoplastic vulcanized rubbers (TPV) are produced only in small and medium-sized plastic processing plants at present, so that not only is the performance of the TPO greatly different from the international advanced level and cannot be applied to high-end fields, but also the polyolefin elastomers (EPDM, POE and OBC) which are key components of the TPO and the TPV are almost imported. Because the production technology of polyolefin elastomer is high in content and the profits are rich, international advanced petrochemical companies implement strict technical blockages on China. The production technology of polyolefin elastomer is not assigned at all, the export of certain high-performance elastomer to China is limited deliberately, the product standard is improved, and the technical barrier is set, so that although advanced processing and forming equipment is introduced by TPE processing enterprises in China, the domestic and peer vicious competition can be developed only in the field of low-grade products.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a polyolefin thermoplastic elastomer and a processing method thereof.
In order to solve the technical problem, the invention provides a polyolefin thermoplastic elastomer, which comprises the following raw material components in parts by weight of 100 parts: 10-50 parts of high-density polyethylene, 50-90 parts of highly branched polyethylene and 0.1-1 part of antioxidant.
The further proposal is that the density of the high-density polyethylene is 0.940-0.976 g/cm3The crystallinity is 80-90%, and the softening point is 125-135 ℃.
The further scheme is that the highly branched polyethylene has the branching degree of 80-125 branches/1000 carbon atoms, the glass transition temperature of-67-57 ℃, the weight average molecular weight of 9.2-42 ten thousand and the Mooney viscosity ML (1 + 4) of 2.12-86.63 at 125 ℃.
The further scheme is that when the branching degree of the highly branched polyethylene is 70-130 branched chains per 1000 carbons, the methyl content is 46.8-66.5 mol%, the ethyl content is 7.2-18.3 mol%, the propyl content is 4.6-8.3 mol%, the butyl content is 3.2-6.7 mol%, the pentyl content is 3.2-5.2 mol%, and the branched chain content with the carbon number not less than 6 is 12.1-15.3 mol%.
In a further embodiment, the antioxidant comprises at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant DLTDP or antioxidant 2921.
The present invention also provides a process for processing the above polyolefin thermoplastic elastomer, the process comprising the steps of:
(1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant in a mixer;
(2) and (3) melting and blending at 190-230 ℃ to obtain the polyolefin thermoplastic elastomer.
Compared with the prior art, the invention has the beneficial effects that:
1. the highly branched polyethylene is an ethylene homopolymer, is a high-performance polyolefin product, is rubber elastic at normal temperature, and has the characteristics of small density, large bending, high low-temperature impact resistance, easiness in processing and the like. Ethylene is the least expensive and most abundant olefin monomer. The catalyst prepared from ZL201210276331.9 and ZL201210276244.3 is used for catalyzing ethylene homopolymerization to prepare the highly branched polyethylene, and the production process is simple and the production cost is low.
2. The use of highly branched polyethylene to replace EPDM, POE, OBC and other elastomers can greatly reduce the production cost of polyolefin thermoplastic elastomers, and is suitable for large-scale industrial production.
Detailed Description
The following examples are given to further illustrate the present invention, but not to limit the scope of the present invention, and those skilled in the art should be able to make certain insubstantial modifications and adaptations of the invention based on the teachings of the present invention.
The highly branched polyethylene used is characterized in that: the branching degree is 70-130 branches/1000 carbons, the weight average molecular weight is 6.6-43.6 ten thousand, and the Mooney viscosity ML (1 + 4) is 6-93 at 125 ℃. Wherein, the branching degree is measured by nuclear magnetic hydrogen spectrum, and the mole percentage content of each branch is measured by nuclear magnetic carbon spectrum.
The following table specifically shows:
Figure DEST_PATH_IMAGE001
example 1:
the polyolefin thermoplastic elastomer comprises the following raw materials in 100 parts by weight: 10 parts of high-density polyethylene, 90 parts of highly branched polyethylene and 10100.1 parts of antioxidant, wherein the density of the high-density polyethylene is 0.976g/cm3The crystallinity is 90 percent, and the softening point is 135 ℃; wherein the highly branched polyethylene used is numbered PER-4.
A processing method of polyolefin thermoplastic elastomer specifically comprises the following steps:
(1) mixing high-density polyethylene, highly branched polyethylene and antioxidant 1010 in a mixer,
(2) melt blending at 190 ℃ to obtain the polyolefin thermoplastic elastomer.
Example 2:
the polyolefin thermoplastic elastomer comprises the following raw materials in 100 parts by weight: 50 parts of high-density polyethylene, 50 parts of highly branched polyethylene and 1681 part of antioxidant.
Wherein the density of the high-density polyethylene is 0.940 g/cm3The crystallinity is 80 percent, and the softening point is 125 ℃; wherein the highly branched polyethylene used is numbered PER-3.
The processing method of the polyolefin thermoplastic elastomer specifically comprises the following steps:
(1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant 168 in a mixer;
(2) melt blending at 230 ℃ to obtain the polyolefin thermoplastic elastomer.
Example 3:
the polyolefin thermoplastic elastomer comprises the following raw materials in 100 parts by weight: 40 parts of high-density polyethylene, 60 parts of highly branched polyethylene and 10760.5 parts of antioxidant, wherein the density of the high-density polyethylene is 0.958 g/cm3The crystallinity is 85 percent, and the softening point is 131 ℃; wherein the adopted highly branched polyethylene comprises 20 parts of PER-1 and 40 parts of PER-6.
The processing method of the polyolefin thermoplastic elastomer specifically comprises the following steps:
(1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant 1076 in a mixer;
(2) melt blending at 210 ℃ to obtain the polyolefin thermoplastic elastomer.
Example 4:
the polyolefin thermoplastic elastomer comprises the following raw materials in 100 parts by weight: 30 parts of high-density polyethylene, 70 parts of highly branched polyethylene and 0.1 part of antioxidant DLTDP.
Wherein the high density polyethylene has a density of 0.947 g/cm3The crystallinity is 82 percent and the softening point is 128 ℃; wherein the highly branched polyethylene used is numbered PER-5.
The processing method of the polyolefin thermoplastic elastomer specifically comprises the following steps:
(1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant DLTDP in a mixer;
(2) melt blending at 210 ℃ to obtain the polyolefin thermoplastic elastomer.
Example 5:
the polyolefin thermoplastic elastomer comprises the following raw materials in 100 parts by weight: 20 parts of high-density polyethylene, 80 parts of highly branched polyethylene and 29210.1 parts of antioxidant.
Wherein the high density polyethylene has a density of 0.956 g/cm3The crystallinity is 84 percent and the softening point is 129 ℃; wherein the adopted highly branched polyethylene comprises 20 parts of PER-2 and 60 parts of PER-5.
The processing method of the polyolefin thermoplastic elastomer specifically comprises the following steps:
(1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant 2921 in a mixer;
(2) melt blending at 210 ℃ to obtain the polyolefin thermoplastic elastomer.

Claims (3)

1. The polyolefin thermoplastic elastomer is characterized in that the polyolefin thermoplastic elastomer comprises the following raw materials in parts by weight of 100 parts: 10-50 parts of high-density polyethylene, 50-90 parts of highly branched polyethylene and 0.1-1 part of antioxidant; the density of the high-density polyethylene is 0.940-0.976 g/cm3The crystallinity is 80-90%, and the softening point is 125-135 ℃; the branching degree of the highly branched polyethylene is 70-95 branches/1000 carbons, the weight average molecular weight is 29.8-43.6 ten thousand, and the Mooney viscosity ML (1 + 4) is 67-93 at 125 ℃; the compound has a methyl group content of 61.2 to 66.5mol%, an ethyl group content of 7.2 to 10.9mol%, a propyl group content of 4.6 to 5.7mol%, a butyl group content of 3.2 to 5.1mol%, and a pentyl group content of 4.6 to 5.7mol%3.2-4.9 mol% and 12.3-15.3 mol% of branched chain with carbon number more than or equal to 6.
2. The polyolefin thermoplastic elastomer of claim 1, wherein the antioxidant comprises at least one of antioxidant 1010, antioxidant 168, antioxidant 1076, antioxidant DLTDP, or antioxidant 2921.
3. A method for processing the polyolefin thermoplastic elastomer of any of claims 1-2, characterized in that the processing method comprises the following steps: (1) mixing high-density polyethylene, highly branched polyethylene and an antioxidant in a mixer; (2) and (3) melting and blending at 190-230 ℃ to obtain the polyolefin thermoplastic elastomer.
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CN109440215B (en) * 2018-11-28 2021-02-09 上海化工研究院有限公司 Preparation method of high-performance polyethylene fiber
CN111393755A (en) * 2019-01-03 2020-07-10 中国石油天然气股份有限公司 Polyolefin thermoplastic elastomer and preparation method thereof

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CA2465479A1 (en) * 2003-04-28 2004-10-28 Tosoh Corporation Polyethylene composition and process for producing same
CA2169180C (en) * 1993-08-17 2007-05-29 Todd J. Obijeski Elastic materials and articles therefrom
CN102827311A (en) * 2012-08-03 2012-12-19 浙江大学 Binuclear acenaphthene (alpha-diimine) nickel/palladium catalysts for olefins, and preparation method and application thereof

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CA2169180C (en) * 1993-08-17 2007-05-29 Todd J. Obijeski Elastic materials and articles therefrom
EP0879264A2 (en) * 1996-02-08 1998-11-25 Buna Sow Leuna Olefinverbund GmbH Polyethylene blend
CA2465479A1 (en) * 2003-04-28 2004-10-28 Tosoh Corporation Polyethylene composition and process for producing same
CN102827311A (en) * 2012-08-03 2012-12-19 浙江大学 Binuclear acenaphthene (alpha-diimine) nickel/palladium catalysts for olefins, and preparation method and application thereof

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