Lignin/polyolefin thermoplastic elastomer composite and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials and discloses a lignin / polyolefin thermoplastic elastomer composite and a preparation method thereof. The composite is prepared from components in percentage by mass as follows: 35%-95% of a polyolefin thermoplastic elastomer, 2%-60% of lignin, 0.5%-8% of an additive A and 0-5% of an additive B. The composite has the tensile strength ranging from 10 MPa to 35 MPa and the elongation at break ranging from 300% to 800%. With addition of lignin and the additives, a non-covalent bond connected energy sacrificial bond function is produced between the phase interfaces of the lignin and the polyolefin thermoplastic elastomer, which promotes dispersion of lignin in the polyolefin thermoplastic elastomer, the interfacial compatibility of the lignin and polyolefin is improved, breaking occurs under the action of external force before covalent bonds break, repeated breaking and reconstruction can be realized, the purpose of improving toughness is achieved, and the problem of poor mechanical performance due to poor compatibility of the lignin and polyolefin is solved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a lignin / polyolefin thermoplastic elastomer composite material and a preparation method thereof. Background technique [0002] Lignin is the second largest biomass resource after cellulose in plants, and it is a natural polymer compound with an aromatic ring structure. It is known as one of the most abundant green resources that can be utilized by humans in the 21st century. Polyolefin thermoplastic elastomer is a kind of polyolefin material whose physical properties are between rubber and plastic. It has both the elasticity of rubber and the ease of processing of plastic, and is recyclable. It is known as the "third-generation rubber ", is an indispensable material for the development of the national economy and high technology. [0003] The key raw material of polyolefin thermoplastic elastomer, polyethylene elastomer POE, is a kind of copolymer product formed by cop...

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Problems solved by technology

Torkelson et al [ACS Sustainable Chem.Eng.2015,3,959.] used solid state shearing method to blend lignin with polypropylene or low-density polyethylene in a specially designed twin-screw extruder, compared to ordinary Mixing method, solid-state shear pulverization can make lignin more uniformly dispersed, but when the mass content of lignin is greater than 10%, the tensile strength and elongation at break of polyethylene or polypropylene composites drop sharply

[0005] Most of the current research on lignin / polyolefin composites uses traditional polyolefin resins as substrates, such as high-density polyethylene, low-density polyethylene, polypropylene, etc., but there is no research on lignin / polyolefin thermoplastic elastomer composites. see the report

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