Hot melt pressure sensitive adhesive

Abstract

The invention discloses a hot melt pressure sensitive adhesive. The hot melt pressure sensitive adhesive is composed of a styrene-butadiene-styrene block copolymer, a styrene-isoprene-styrene block copolymer, a tackifying resin, isocyanate, an antioxidant, nano-silica and a plasticizer. A preparation method of the hot melt pressure sensitive adhesive comprises: feeding nitrogen gas into a reactor,adding a plasticizer into the reactor, carrying out heating stirring, adding the tackifying resin, isocyanate, antioxidant and nano-silica into the mixture, after the tackifying resin is fully molten, adding the styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer into the mixture, carrying out heating stirring, after full melting, stopping nitrogen gas feeding,carrying out vacuum degassing until the uniform transparent viscous liquid is obtained, stopping heating and stirring, discharging the hot adhesive and carrying out cooling. Through use of isocyanateand nano-silica as modifying materials, the initial adhesion, initial peel strength, final peel strength and heat resistance are improved.

Description

technical field [0001] The invention relates to the technical field of synthetic adhesives, in particular to a hot-melt pressure-sensitive adhesive. Background technique [0002] Pressure-sensitive adhesive refers to a type of adhesive that is sensitive to pressure and can be bonded to the adherend with a little pressure, without the use of solvents or other auxiliary means. Hot-melt pressure-sensitive adhesive is a pressure-sensitive adhesive It is a new type of adhesive tape mainly made of synthetic rubber, resin and rubber oil, etc., which are mixed and heated into a molten state and then coated on a substrate such as tissue paper, cloth or plastic film. The biggest advantage, the defect is that the viscosity is obviously affected by temperature. Mainly used for all kinds of box sealing, box sealing, paper product packaging, beverage bottle labels, sealing aluminum foil, flexible packaging and other packaging and environmentally friendly paper pallets, etc. It is suitabl...

AI Technical Summary

Problems solved by technology

[0003] The main components of hot-melt pressure-sensitive adhesives are base materials, plasticizers, tackifiers, fillers, antioxidants, and thermoplastic elastomers. Base materials are the main components of pressure-sensitive adhesives, and plasticizers are a kind of Substances that can reduce the glass transition temperature and melting temperature, improve brittleness, and enhance melt fluidity. Tackifiers are substances that can produce high adhesion under certain conditions of temperature, pressure, and time through surface diffusion or internal diffusion. Fillers are In the adhesive component, it is a solid material that does not chemically react with the main material but can change its performance and reduce costs. Antioxidants are compounds that can prevent or inhibit the oxidation process. Thermoplastic elastomers have low modulus, solution viscosity and melt viscosity. and other excellent properties, with good processing performance, hot-melt pressure-sensitive adhesives are developing rapidly, but the current products still have shortcomings such as poor heat resistance and poor bonding strength, thus limiting their application range