Organosilicon release agent with ultra-light release force and preparation method thereof

Abstract

The invention provides a formula and a preparation method of an organosilicon release agent with ultra-light release force. Vinyl silicone oil, methyl fluorosilicone oil and amino silicone oil are respectively used as a main agent, a light stripping agent and an anti-migration agent and are matched with other materials to obtain the organosilicon release agent; an organosilicon release film with ultra-light release force is obtained by coating a polymer film (PET, PP, PE, PI and the like) with the organosilicon release agent, the release force of the organosilicon release film is greatly reduced, a high residual rate is ensured, and the release film surface obtained by the formula has a film surface effect with uniform color. The product can meet the requirement for ultra-light release force of a release film on the market, and the application field of a traditional organosilicon release agent is further widened.

Description

technical field [0001] The invention relates to the field of organosilicon release agents, in particular to a formula and a preparation method of an organosilicon release agent with ultra-light release force. Background technique [0002] There are many types of release agents. Silicone release agents occupy a large part of the market due to many advantages, such as low cost, relatively good storage stability and thermal stability, simple coating process, and relatively high film-forming properties. Low surface energy, especially by adjusting the formulation can get 1-1000g / in release force range. Compared with other types of release agents, silicone release agents have an irreplaceable position. [0003] The release agent is mainly used for coating on the surface of the substrate. After coating and curing, it is used to isolate the viscous substance, so that the viscous substance can be easily peeled off from the surface while the viscous substance remains sticky. Among t...

AI Technical Summary

Problems solved by technology

However, this solution needs to be coated twice on the substrate, and the process is complicated and inefficient

The curing of the silicone oil layer is greatly affected by water. If the matte release agent layer absorbs too much water, it will cause side reactions when the silicone oil layer is applied on it, resulting in abnormal release force of the product.

Silicone oil coated on the matte release agent is still physically wetted, rather than chemically cross-linked on the substrate, and the binding force cannot be substantially improved

[0008] The prior art discloses a solvent-free silicone release agent with light peeling force, and the release force is greatly reduced by using a fluorine-containing release force regulator

However, due to the poor compatibility of small-molecule fluorine-containing release force regulators in silicone oil systems, small molecular substances will migrate out of the surface after coating and forming of such products, resulting in color difference and uneven color on the film surface, and will also lead to this type of product. When the product is in use, small molecular substances migrate to the surface of the pressure-sensitive adhesive, resulting in low peeling force of the pressure-sensitive adhesive, which is often referred to as a low residual rate in the industry

When a flat release surface is attached to the surface of the pressure-sensitive adhesive for a long time, the release force will also increase significantly with time, so only measuring the release force for 20 minutes cannot fully characterize the release force stability of the release film

At the same time, small molecule fluorine-containing release force regulators are expensive and not suitable for mass production

[0009] The prior art discloses a release film with ultra-light release force. The release film is divided into three layers, which are a thin film layer, a silicone oil layer and a release layer. The thickness of the silicone oil layer is 10-20 μm. The thickness of the release layer is 15-25μm. Although it can achieve a low release force in a short period of time, it is difficult to achieve the requirement that the 24h release force is less than 3g / in

And the thickness of the coating is large, the cost is high, the curing time is 10 minutes, the production efficiency is slow, and it is difficult to achieve mass production

The release layer is also difficult to adhere to the low surface energy silicone oil layer, which can easily lead to debonding