A kind of low-temperature reaction type hot-melt adhesive tape without base material and its glue and preparation method

Abstract

The invention discloses a formula and a preparation method of substrate-free low temperature reactive hot melt adhesive tape. The adhesive tape consists of substrate-free dry glue and a double-sided release film or double-sided release paper; the glue is prepared from 100-150 parts of thermoplastic polyurethane, 50-150 parts of rosin glyceride, 1-40 parts of a blocked crosslinking agent, 1-10 parts of a wetting leveling agent, 1-10 parts of a defoaming agent, 1-10 parts of a rheological agent, 0.1-5 parts of an anti-aging agent and 100-400 parts of a mixed solvent of ketones and esters; the substrate-free low temperature reactive hot melt adhesive tape is prepared by coating a substrate with the glue, drying, winding, and cutting. By designing the deblocking temperature of the crosslinkingagent and the softening point of the resin, the adhesive tape can be stored and transported at room temperature, and can realize a bonding strength of 2-3 N / mm<2> at a lower heating temperature (90-110 DEG C) and a lower pressure (1-2 bar). Therefore, the substrate-free low temperature reactive hot melt adhesive tape can solve the problems that the existing low-temperature hot melt adhesive is low in bonding strength, and the low-temperature reactive hot-melt adhesive requires special storage and transportation conditions; the substrate-free low temperature reactive hot melt adhesive tape cangreatly reduce the raw material storage and transportation costs of the electronic device manufacturer, and meets the bonding requirements for small parts of the current electronic products.

Description

technical field [0001] The invention discloses a substrate-free low-temperature-reactive hot-melt adhesive tape and a formula and preparation method thereof, belonging to the field of adhesives. Background technique [0002] Hot melt adhesive is an adhesive that does not have viscosity or low viscosity at room temperature, but becomes sticky after heating. It can be divided into reactive hot melt adhesive and non-reactive hot melt adhesive. Non-reactive hot-melt adhesive, in the hot-melt state after heating, exhibits the characteristics of pressure-sensitive adhesive. At this time, a certain pressure is applied to bond the adherend. After cooling to normal temperature, the colloid returns to non-viscous or low viscosity solids. Reactive hot-melt adhesive, in the hot-melt state after heating, not only exhibits the characteristics of pressure-sensitive adhesives, but also has reactivity, which further enhances the cohesion of the colloid, and at the same time reacts with func...

AI Technical Summary

Problems solved by technology

[0006] But hot-melt tapes also have deficiencies: non-reactive hot-melt tapes tend to have low adhesion, and it is difficult to achieve sufficient bonding strength; while reactive hot-melt tapes can obtain higher adhesion, but there are problems with preservation and sizing. Contradiction—The low-temperature reaction type must be sealed and stored in isolation from the air, which is inconvenient for storage and transportation, and the short sizing time is difficult for practical application; the medium-high temperature reaction type hot-melt adhesive is easy to store, but the sizing temperature is high, and the electronic device is difficult to withstand

The current common hot-melt tapes are difficult to balance the glue thickness and reactivity, and it is difficult to take into account the reactivity and sizing temperature

In order to solve the above problems, the main low-temperature reactive hot-melt tapes in the current market use the curing agent and thermoplastic elastomer to mix directly and then wet-coat. The product must be stored and transported in a low-temperature refrigerator, and it needs to be used in a very short time. To complete various operations, there are very strict requirements on production equipment, storage and transportation equipment and the use environment, which greatly increases the production costs of related enterprises