Functional OBC (olefin block copolymer) antioxidant masterbatch as well as preparation method thereof

Abstract

The invention discloses a functional OBC (olefin block copolymer) antioxidant masterbatch as well as a preparation method thereof. The antioxidant masterbatch is prepared from 60-98 parts of an OBC, 0.01-0.5 part of an initiator, 0.5-5 parts of a diluent, 0.5-5 parts of a graft monomer, 0.2-5 parts of an auxiliary graft monomer, 0.1-0.5 part of a cross-linking inhibitor and 2-40 parts of an antioxidant. The OBC is mixed with the cross-linking inhibitor, and the mixture is added from a main feeding port, the graft monomer, the auxiliary graft monomer and the diluent are respectively added to different locations of an extruding machine for participating a reaction, residues are removed by vacuumizing after the reaction, the antioxidant is added to a side feeding port on the back side of vacuum removal, an ultrasonic enhancing dispersion effect is implemented at a die head, and finally granulation is performed. The OBC is selected as matrix resin and functionalized by means of reactive extrusion, the antioxidant is further added, the antioxidant masterbatch with reactive polarity is produced by a one-step method, and functionality, stability and convenience of the antioxidant masterbatch are highlighted in applications.

Description

technical field [0001] The invention belongs to the field of polymer material modification, and in particular relates to a functionalized olefin block copolymer anti-oxidation masterbatch and a preparation method thereof. Background technique [0002] Olefin block copolymer (OBC) is a new type of olefin polymer synthesized by Dow Chemical Company through catalytic block copolymerization technology, which consists of crystallizable ethylene-octene segments (hard segments) with low comonomer content and high melting temperature ) and segmental (soft segment) composition of amorphous ethylene-octene with high comonomer content and low glass transition temperature. Due to the special block copolymerization technology used in OBC, it has obvious characteristics different from other polyolefin plastomers and elastomers, and can break the material properties of the traditional relationship between flexibility and heat resistance, and can significantly improve compression permanent ...

AI Technical Summary

Problems solved by technology

[0004] Traditional POE is a non-polar polymer, which is often used in non-polar polyolefin systems to improve the toughness, elasticity and ductility of materials, but it is used in polar materials such as nylon, polyester, polycarbonate, etc. When engineering plastic systems are used to improve toughness, or to bond polyolefins to metals, polyolefins to polar resins, the effect is often not good, and the polarity must be increased. There are many means of polarization, and the commonly used methods are: Surface modification methods such as chemical oxidation method, flame method, plasma modification, corona discharge method, primer method, grinding method, mechanochemical method and graft modification treatment, as well as surface modification such as adding surface modifiers, etc. Mixed modification methods, etc., each method has its advantages and disadvantages. Among them, the graft modification method is often used because of its simple operation and outstanding effect. The graft modified POE is applied to the toughening of engineering plastics or with other materials. When bonding, it can reduce the interfacial tension with polar resin or metal, improve toughness or bonding strength, and the invention patents CN102391432B, CN103450403A and CN104592450B all mentioned this method

However, due to the low melting point of POE, it is difficult to improve this inherent characteristic when it is grafted and modified. It is used in some occasions, such as the preparation of toughened nylon, which will greatly reduce the service temperature and thermal deformation of the material. temperature, limited application

Moreover, the polarized modified POE products that have been commercialized at present are all single polarized, which can only give the material the effect of improving the interfacial bonding force. In order to ensure the anti-oxidation effect of the material, it needs to be used downstream. Additional antioxidants are added, which increases the operation steps. Second, because the added antioxidants are mostly powder additives, and the addition amount is extremely low, there is uneven mixing during the mixing process with the granular matrix resin. risk, the antioxidant effect will be greatly reduced

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