Low-temperature resistant rosin thickening resin, preparation method and usage thereof

Abstract

The invention discloses a preparation method of low-temperature resistant rosin thickening resin, which comprises the following steps of: under the protection of inert gas, melting rosin, and reaction the melted rosin with polyalcohol for 4-24h at the temperature of 200-290 DEG C under the action of catalyst; discharging to obtain polyalcohol modified abietate; and then, under the protection of inert gas, reacting the obtained polyalcohol modified abietate with higher fatty acid at the temperature of 200-290 DEG C for 4-24h, and discharging to obtain the rosin thickening resin; or under the protection of inert gas, melting the rosin, and then adding catalyst, the polyalcohol and the higher fatty acid into the melted rosin, carrying out reaction for 4-24h at the temperature of 200-290 DEG C, and discharging to obtain the rosin thickening resin. The rosin thickening resin prepared by the method is low in softening point and viscosity and higher in cold resistance. Meanwhile, the invention also discloses the low-temperature resistant rosin thickening resin prepared by the method disclosed by the invention, and the usage of the low-temperature resistant rosin thickening resin in preparation of a hot melt pressure sensitive adhesive.

Description

technical field [0001] The invention relates to a rosin tackifying resin and a preparation method thereof, in particular to a low temperature resistant rosin tackifying resin and a preparation method thereof. Background technique [0002] Rosin is an important natural product in my country, a renewable resource, commonly used in coatings, inks, adhesives and other fields. However, there are carboxyl groups and conjugated double bonds in rosin molecules, which have certain reactivity. There are great defects in application, such as high acid value, poor acid and alkali resistance. In order to broaden the application of rosin, rosin is often modified. [0003] Rosin tackifying resin is one of the important components of hot-melt pressure-sensitive adhesive (HMPSA), which can endow HMPSA with excellent mechanical properties and different temperature ranges. The traditional rosin ester obtained after polyol modification has a high softening point and high viscosity. The temp...

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Problems solved by technology

Coating HMPSA in this temperature range not only consumes a lot of energy, but also increases the difficulty and cost of construction. It will cause burns to the PE film, and at the same time bring about the aging of part of the HMPSA and the loss and degradation of the machine.

In addition, the softening point of rosin tackifying resin in traditional hot-melt pressure-sensitive adhesives is often high. At low temperature, the molecular movement becomes slow, and it is difficult to quickly wet the adhered surface. At the same time, the hardening modulus of pressure-sensitive adhesives increases at low temperatures When the same pressure is applied, the deformation of the glue is small, and the effective contact area is smaller than that at room temperature, which eventually leads to low bonding strength, viscosity drop, and bonding failure.

Moreover, my country has a vast territory, east tide and west dryness, and climate diversity in the south and north. Many glues can only be used in the milder environment in the south. When it reaches the cold weather in the north, it loses its original bonding performance.

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