One-component dealcoholized room temperature vulcanized silicone rubber and its preparation method and application

Abstract

The invention relates to a monocomponent dealcoholized room temperature vulcanized silicone rubber, and a preparation method and an application thereof. The monocomponent dealcoholized room temperature vulcanized silicone rubber is prepared from, by weight, 150-200 parts of a base polymer, 5-40 parts of a cross-linking agent and 80-300 parts of a functional filler; and the base polymer is one of 107 silicone rubbers with the dynamic viscosity of 5000-50000cps or a mixture formed by mixing at least two of the 107 silicone rubbers, the functional filler is titanate catalyst supported modified nanometer calcium carbonate composite particles, and the cross-linking agent is at least one of tetramethoxysilane, tetraethoxysilane, tetrapropoxysilane and methyltrimethoxysilane. The nanometer calcium carbonate is modified with a titanate coupling agent and loads the titanate catalyst to make the monocomponent dealcoholized room temperature vulcanized silicone rubber have good compatibility, tensile adhesive strength, antirust property and flame resistance; the titanate catalyst and the cross-linking agent are not simultaneously added, so the peak viscosity is inhibited, and yellowing of the vulcanized silicone rubber is effectively prevented; and the adhesive performance of the monocomponent dealcoholized room temperature vulcanized silicone rubber is excellent, and the surface drying time is shorter than 10min.

Description

Technical field [0001] The invention belongs to the technical field of organic silicon adhesive preparation, and specifically relates to a single-component dealcoholization type room temperature vulcanized silicone rubber and a preparation method and application thereof. Background technique [0002] One-component room temperature vulcanized silicone rubber is a moisture-curable one-component silicone adhesive. It is based on hydroxyl-terminated polydimethylsiloxane as the base polymer, trifunctional silane is the crosslinking agent, and supplemented by fillers. , Plasticizer and catalyst, etc. Silicone rubber has excellent aging resistance, high insulation, high temperature resistance and medium resistance, so it has been widely used in bonding and sealing in aerospace, construction, automobiles, electronic appliances and other fields. Dealcoholized room temperature vulcanized silicone rubber is a type of one-component room temperature vulcanized silicone rubber. Because of its...

AI Technical Summary

Problems solved by technology

However, since the tensile strength and anti-yellowing properties of this type of silicone rubber are far from meeting the needs of the use conditions, their industrial use value is greatly limited.

[0003] In the patent application with the application number CN200910069215.8, a high temperature resistant rapid curing dealcoholization type room temperature vulcanized silicone rubber adhesive is introduced, using dibutyltin dilaurate or dioctyltin dilaurate as the catalyst, due to the introduction of tin Elements will inevitably cause harm to the human body. At the same time, the gas-phase titanium dioxide and silicon dioxide are used as additives to enhance its performance. Not good, at the same time too much hydroxyl group at high temperature will affect the high temperature resistance of the material

In the patent application with the application number CN201410664829.1, an environmentally friendly adhesive sealant for LED lamps is introduced. The self-made organosilicon-titanium complex is used as a catalyst. During the preparation process, it is easy to cause viscosity peaks and affect the produced rubber. At the same time, calcium carbonate and titanium dioxide are single or mixed as a reinforcing agent to enhance its performance. However, because calcium carbonate is the same as silicon dioxide, its surface hydrophilicity is difficult to be compatible with raw materials. The prepared by the prior art One-component dealcoholized room temperature vulcanized silicone rubber still has certain deficiencies in compatibility, yellowing resistance, flame retardancy and adhesion.

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