High-fluidity metallocene low-density polyethylene resin graft and preparation method thereof

Abstract

The present invention belongs to the field of polymer material modification, and particularly relates to a high-fluidity metallocene low-density polyethylene resin graft, which comprises the following raw materials by weight: 100 parts of an mLLDPE resin, 0.3-0.8 part of a peroxide initiator, 3-7 parts of maleic anhydride, and 0.1-0.6 part of an antioxidant. The present invention further provides a preparation method of the graft. The preparation method comprises: feeding the materials into a co-rotating twin screw reaction extruder, and post-treating the reaction materials to obtain the grafted product, wherein the material drum of the extruder is divided into three sections, the first section is a melt mixing and dispersing section, the second reaction is a reaction section, and the third section is a metering molding section. According to the present invention, the maleic anhydride is successfully grafted onto the high-performance metallocene linear low-density polyethylene to prepare the high-fluidity metallocene low-density polyethylene resin graft, wherein the melt mass flow rate can achieve more than or equal to 15 g / 10 min, the tensile strength can achieve more than or equal to 17 MPa, and the high grafting rate is provided.

Description

technical field [0001] The invention belongs to the field of polymer material modification, and in particular relates to a high-fluidity metallocene low-density polyethylene resin graft and a preparation method thereof. Background technique [0002] The polyethylene grafting reaction can adopt various methods such as solution method, solid phase method and reactive extrusion method (ie, melting method). The melting method is to introduce the grafting monomer into the polyethylene polymer melt so that the grafting monomer is grafted onto the main chain of polyethylene. The advantage is that no solvent or less solvent is used, the reaction time is short, and the production process is less. , can be produced continuously on a large scale, and is currently the most widely used polyethylene grafting reaction method in industrial production. The raw materials for polyethylene grafting reaction are mostly high-density polyethylene (HDPE), low-density polyethylene (LDPE) or linear ...

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Problems solved by technology

Chinese patents CN1318609A and CN1495243A are all grafts obtained by co-grafting of mPE and LLDPE mixtures with unsaturated carboxylic acids, but the fluidity and grafting rate of the obtained grafts are not high

However, polyethylene resin grafts with high fluidity and high grafting rate have more advantages in the application of blending compatibilization, adhesion and other fields, and the above patented technologies are difficult to obtain high MFR and high grafting rate. Therefore, there is currently no product and technology that can produce low-density polyethylene resin grafts with high grafting rate and high fluidity and certain mechanical properties in industrialization.

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