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Preparation method of polyolefin thermoplastic elastomer based on dynamic crosslinking modification

A technology of polyolefin elastomer and thermoplastic elastomer is applied in the field of preparation of high-performance polyolefin to achieve the effects of high copolymerization capacity, high industrial value and high selectivity

Active Publication Date: 2022-01-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, how to effectively realize the compatibility of dynamic covalent crosslinking of POE with common processing methods of polyolefins such as melt extrusion is still a difficult problem.

Method used

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  • Preparation method of polyolefin thermoplastic elastomer based on dynamic crosslinking modification
  • Preparation method of polyolefin thermoplastic elastomer based on dynamic crosslinking modification
  • Preparation method of polyolefin thermoplastic elastomer based on dynamic crosslinking modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this experiment, α-thioglycerol was selected as the thiol compound, the photoinitiation method was adopted as the initiator 2,2-dimethoxy-2-phenylacetophenone, and the cross-linking agent was p-diphenylboronic acid pina alcohol esters. In a 100ml schlenk flask, add 2.0g of the product synthesized in Comparative Example 1 and 55mL of a mixed solvent of toluene and ethanol (volume ratio toluene:ethanol=10:1), and the flask is vacuumed and purged with nitrogen. The mixture was heated at 85 °C for 20 min to dissolve the copolymer and cooled to room temperature. Add α-thioglycerol and 2,2-dimethoxy-2-phenylacetophenone, the molar ratio of α-thioglycerol to vinyl group is 20, 2,2-dimethoxy-2- The molar ratio of phenylacetophenone to vinyl groups is 1. The mixture was irradiated with 365nm ultraviolet light for 1 h, the product was precipitated in ethanol and washed several times, and vacuum-dried at room temperature to constant weight to obtain a functional group-modifie...

Embodiment 2

[0042] Experimental condition is: change raw material to comparative example 2, other experimental conditions are the same as embodiment 1.

Embodiment 3

[0044] The experimental conditions are as follows: change the raw material to Comparative Example 3, and the other experimental conditions are the same as in Example 1.

[0045] The properties of the materials prepared in the above-mentioned Examples 1-3 and Comparative Examples 1-3 were tested, and the test results are shown in Table 2. The data obtained by table 2, according to the comparative data of embodiment 1 and comparative example 1, embodiment 2 and comparative example 2, embodiment 3 and comparative example 3, adopt the technical scheme of the present invention to prepare dynamic cross-linking modified polymer Olefin elastomer has higher mechanical strength than the material before modification and crosslinking, and the reprocessing efficiency can reach more than 90%.

[0046] Table 2: Material property results

[0047]

[0048] Note: ENGAGE 8150 means POE industrial sample of DOW company.

[0049] According to the comparative data of Example 2 and DOW's POE in...

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Abstract

The invention discloses a preparation method of a dynamically cross-linked polyolefin elastomer, which comprises the following steps of carrying out ternary polymerization on ethylene, alpha-olefin and polyene monomers in a solution polymerization system, and modifying a vinyl group in the terpolymer into a cross-linkable group by utilizing efficient sulfydryl-ene click chemistry, and then carrying out melt reaction extrusion processing to synthesize the dynamically cross-linked polyolefin elastomer. The amorphous ethylene / alpha-olefin random copolymer is taken as a main chain, and dynamic chemical crosslinking groups are introduced on the basis of a physical crosslinking point with a polyethylene crystalline region, so that the mechanical property, solvent resistance and heat resistance of the material are improved, and meanwhile, the reprocessability of the material is not influenced. The dynamically cross-linked polyolefin elastomer prepared by the invention can be applied to a plurality of application fields such as thermoplastic elastomers and the like, and has very high industrial value.

Description

technical field [0001] The invention belongs to the technical field of high-performance polyolefin preparation, and relates to a polyolefin thermoplastic elastomer based on dynamic crosslinking modification. Background technique [0002] The recycling of plastics has become a worldwide concern, and the development of recyclable plastics with good reprocessing properties is urgently needed. Among all kinds of plastics, polyolefin accounts for more than 50% of the total consumption of plastics and is the largest polymer product in the world. Common polyolefin products, such as vulcanized rubber and thermoset resins, are chemically cross-linked to achieve excellent mechanical properties and thermal stability at the expense of processing and recycling properties. High-end polyolefin elastomers (POE) such as ethylene / 1-hexene and ethylene / 1-octene copolymers are thermoplastic elastomers with good mechanical properties and reprocessing properties, and are widely used in the autom...

Claims

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Application Information

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IPC IPC(8): C08L23/32C08K5/55C08K5/092C08K5/07C08K5/053C08J3/24
CPCC08J3/24C08J2323/32C08K5/55C08K5/092C08K5/07C08K5/053
Inventor 刘平伟王文俊肖扬可李伯耿
Owner ZHEJIANG UNIV
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