High temperature-resistant polyacrylate pressure-sensitive adhesive emulsion and preparation method and application thereof

Abstract

The invention relates to high temperature-resistant polyacrylate pressure-sensitive adhesive emulsion and a preparation method and application thereof. The emulsion mainly consists of a hard monomer, a soft monomer, a functional monomer, reactive tackifying resin, a reactive emulsifier, an initiator and a curing agent. The preparation method comprises the following steps of: adding a monomer dissolved with the tackifying resin into the aqueous solution of the reactive emulsifier for pre-emulsification by adopting the pre-emulsification semi-continuous seeding polymerization process, performing polymerization on the pre-emulsified liquid through the initiator, and adding the curing agent to prepare the high temperature-resistant polyacrylate pressure-sensitive adhesive emulsion. The pressure-sensitive adhesive of the invention has heat resistance of 200 DEG C, has excellent water resistance, aging resistance and mechanical property, and can be widely applied to the fields of electronics, electrical appliances, automobile manufacturing and the like.

Description

technical field [0001] The invention relates to the field of water-based pressure-sensitive adhesives, in particular to a high-temperature-resistant polyacrylate pressure-sensitive adhesive emulsion and its preparation method and application. technical background [0002] High temperature resistant pressure-sensitive adhesive generally means that after a period of time at a certain temperature, when it is peeled off from the adherend, there will be no residual glue on the adherend and a certain mechanical strength. High temperature resistant pressure-sensitive adhesives are used in environments of 130°C or higher, such as bonding, protection, fixing, and insulation of transformers, motors, coils, circuit boards, etc. in the fields of electronics, electrical appliances, and automobile manufacturing. , sealing, shock absorption. According to different working environments and requirements, pressure sensitive adhesives have different high temperature resistance grades (130°C, ...

AI Technical Summary

Problems solved by technology

However, at present, emulsion-type polyacrylate pressure-sensitive adhesives cannot completely replace solvent-type pressure-sensitive adhesives in terms of comprehensive performance, especially for products that require high temperature resistance and mechanical properties.

Japanese patent JP2005136298-A relates to a pressure-sensitive adhesive prepared by adding a cross-linking agent containing isocyanate and epoxy groups and melamine to a polyacrylate emulsion synthesized by copolymerization of butyl acrylate, acrylonitrile and acrylic acid, but the pressure The sensitive adhesive has poor mechanical properties, the peel strength is less than 200N / m, and the stability is not good, and residual adhesive is easy to appear; the patent CN20041004155.7 uses tetrabutoxytitanium as a crosslinking agent to prepare polyacrylate emulsion pressure sensitive adhesive, which also exists Poor mechanical properties and unsatisfactory high temperature resistance; patent CN01819920.8 uses bisamide crosslinking agent to modify polyacrylate emulsion pressure sensitive adhesive. When the pressure sensitive adhesive is in a high temperature environment above 150 ℃, the peel strength basically disappears

Therefore, the disadvantages of poor high temperature resistance and low mechanical properties severely limit the application and development of emulsion pressure-sensitive adhesives.

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