Mlldpe resin composition for plastic greenhouse film and preparation method thereof

Abstract

The invention relates to a mLLDPE resin composition for plastic greenhouse films and a preparation method thereof. It is composed of the following raw materials, and the parts by weight of each component are: mLLDPE resin 100; peroxide 0.03-0.15; maleic anhydride grafting Monomer masterbatch 6‑14; electron donor 0.05‑1.5; antioxidant 0.1‑0.6; rheological agent 0.04‑0.08; lubricant 0.04‑0.12. The mLLDPE resin composition has relatively high melt viscosity and melt elongation, and the greenhouse film and other films with excellent mechanical properties can be blown on an ordinary single-layer film blowing machine to realize the preparation of a single-layer film.

Description

Technical field [0001] The present invention relates to a method and application of a MLLDPE resin for a plastic greenhouse film, which belongs to the field of polymer material modification. Background technique [0002] The MLLDPE molecular structure polymerized by metallocene catalyst has a narrow molecular weight distribution, and the composition distribution of the co-polymer monomer between the molecular chain is very uniform and the content is uniform. The molecular chain core crystal generating speed is equal, the crystal form is uniform. It is these structural characteristics that make MLDPE compared to conventional linear polyethylene resins (LLDPEs), high physical machinery strength, excellent tear and anti-puncture performance, optically transparent, mainly used in production thinner , Lighter film, packaging film and other film fields. However, the molecular structure of MLLDPE makes its melt viscosity, and is not sensitive to shear when machining, resulting in exempl...

AI Technical Summary

Problems solved by technology

Chinese patent CN (103374171A) first prepares UHMWPE / POE blends with partially disentangled molecular chains by means of programmed feeding, and then obtains high melt strength metallocene polyethylene compositions by melt blending. The main technology of this patent is It is the preparation of UHMWPE / POE blends with partially disentangled molecular chains, but UHMWPE is difficult to process and requires high processing equipment, so the market is difficult to be enlarged and applied

3. The method of improving the processing performance of metallocene polyethylene by improving the polymerization process and processing equipment is complex, technically difficult, costly, and narrowly applicable

[0004] In addition, the use of grafting technology to produce long chain branches in polyethylene resin can also improve the melt strength of polyethylene resin, and has little impact on other properties of the material, but the existing, especially the most widely used reactive extrusion method ( That is, the melting method) grafting technology is applied to the grafting reaction of metallocene polyethylene resin with low melt strength, and there is a problem of limited reaction efficiency.

Other grafting technologies, such as Chinese patent (CN200610021813.4), disclose the method of mechanochemical reaction to produce long chain branches in metallocene polyethylene resin to improve its melt strength, but there is also the problem that the uniformity of the reaction is not easy to control

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