Crosslinkable polyethylene hot-melt adhesive composition and preparation method and application thereof

Abstract

The invention discloses a crosslinkable polyethylene hot-melt adhesive composition. The composition is prepared from the following components by weight portion: 60 to 92 portions of polyethylene, 8 to 30 portions of other polyolefin, 0.01 to 0.2 portion of evocating agent, 0.3 to 3 portions of silane coupling agent, 0.1 to 2 portions of polar monomer and 0.1 to 5 portions of auxiliary agent by a one-step method. The crosslinkable polyethylene hot-melt adhesive composition has the characteristics of high bonding strength, ideal temperature tolerance, excellent chemical resistance and good environmental stress cracking resistance, and can be widely used in metal-plastic bonding under severe conditions requiring temperature tolerance and acid and alkali resistance; meanwhile, the composition can also be pulverized so as to be used as inside and outside container coat such as container inner lining, water heater tank, inside and outside pipeline coat and the like.

Description

technical field [0001] This article relates to a polyethylene hot-melt adhesive product, especially a cross-linkable polyethylene hot-melt adhesive that can be used in harsh conditions such as temperature resistance or chemical resistance, and can also be ground into powder for internal and external coating of containers. Layers, such as container linings, water heater liners, and internal and external coatings for pipes, etc. technical background [0002] Polyethylene is the most important downstream product of ethylene, which accounts for 70% of the world's polyolefin consumption. It has excellent performance, non-toxic and tasteless, cheap raw materials, good low temperature resistance, low water absorption, excellent chemical stability, Various chemicals such as hydrochloric acid, hydrofluoric acid, amines, sodium hydroxide, potassium hydroxide, etc. However, polyethylene is not resistant to high temperatures. The maximum operating temperature of low-density polyethylene...

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Problems solved by technology

It is mainly composed of reactive polyolefin (siloxane-based grafted amorphous polyolefin), tackifier and catalyst. The hot melt adhesive has the following problems: 1. If the tackifier is used too much, the surface will be more viscous and difficult to process. It is difficult to store and store, and the adhesion is relatively low when used less; 2 The curing speed is slow and the relative initial adhesion is low

[0006] Chinese patent 03150344.6 introduces a polyolefin composition with high temperature and corrosion resistance. Since the composition includes silane-grafted polyolefins and polar polymers, it needs to be produced in several steps, the process is complicated, and the silane-grafted polyolefins produced Olefins are very easy to absorb water and cross-link during storage, which affects the performance of finished products. At the same time, silane-grafted polyolefins partially act as fillers in the production process of finished products, and there may be problems of uneven dispersion

[0007] Another Chinese patent 00109087.9 melt-grafts polyethylene after pre-radiation, and the obtained functionalized polyethylene has good bonding performance with metals, ceramics, glass, etc., and because polyethylene has low temperature resistance, the functionalized polyethylene The use temperature of the material is limited, and the chemical resistance and strength are average, so it cannot be used as a container lining

[0008] In addition, regarding the cross-linking of polyethylene, there are currently two more mature methods, one is the two-step method developed by Dowcoming in the United States, called the Sioplas method, and the other is the one-step method developed by Nokia-Maillefer in Switzerland. , that is, the Monoail method, the cross-linked polyethylene obtained by the two methods can reach a high level (more than 80% cross-linking degree), has good temperature resistance and chemical stability, but the material does not have adhesive properties

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