Single-component flame-retardant ketoxime-removed/dealcoholized room temperature vulcanized organosilicon sealant and preparation method thereof

Abstract

The invention provides a single-component flame-retardant ketoxime-removed/dealcoholized room temperature vulcanized organosilicon sealant and a preparation method thereof. The single-component flame-retardant ketoxime-removed/dealcoholized room temperature vulcanized organosilicon sealant is prepared from the following materials in parts by weight: 100 parts of alpha, omega-dihydroxy polydimethylsiloxane, 10-60 parts of a flame-retardant filler, 50-150 parts of a reinforcement filler, 1.5-2 parts of a ketoxime silane cross-linking agent, 1.5-3 parts of an alkoxysilane cross-linking agent, 1.5-3 parts of an adhesion promotor and 0.5-1.5 parts of a catalyst. The single-component flame-retardant ketoxime-removed/dealcoholized room temperature vulcanized organosilicon sealant is flame-retardant, has excellent high-temperature resistance and yellowing resistance, and has favorable bonding performance to various base materials, such as metal and plastics.

Description

technical field [0001] The invention relates to a single-component flame-retardant deketoxime / alcohol room-temperature vulcanized silicone sealant and a preparation method, belonging to the technical field of polymer materials and their production. Background technique [0002] One-component condensation type room temperature vulcanizing silicone sealant is the most common and most used room temperature vulcanizing silicone sealant. widely used. One-component condensation type room temperature vulcanizing silicone sealants can be divided into deketoxime type, deacidification type, dealcoholization type, deacetone type and deamidation type according to different crosslinking agents. The current practical application in engineering is mainly deketoxime type and deacidification type one-component room temperature vulcanizing silicone sealant. [0003] The deketoxime type one-component room temperature vulcanizing silicone sealant has the advantages of high storage stability, ...

AI Technical Summary

Problems solved by technology

[0003] Deketoxime type one-component room temperature vulcanizing silicone sealant has the advantages of high storage stability, fast vulcanization speed and good adhesion to various substrates, but has the disadvantages of slight corrosion to copper and strong odor

Dealcoholized one-component room temperature vulcanizing silicone sealant has the advantages of environmental protection, low odor, and no corrosion to substrates, but it also has disadvantages such as poor storage stability, slow vulcanization speed, and poor adhesion to various substrates.

In the fields of energy-saving lamps, LED lamps, and electronic and electrical components, one-component room temperature vulcanized silicone sealants that are flame-retardant, good in storage stability, non-corrosive to substrates, and good in adhesion to various substrates are required. Both deketoxime type and one-component dealcoholized room temperature vulcanizing silicone sealants are difficult to meet the application requirements

[0004] One-component deketoxime / alcohol type one-component room temperature vulcanizing silicone sealant combines the advantages of deketoxime and dealcoholized room temperature vulcanizing silicone sealant, but they basically do not contain flame retardants, and neither of them can produce flame retardant room temperature vulcanized silicone sealants, and some additional inorganic moisture scavengers, such as molecular sieves, anhydrous calcium chloride, etc., will increase the process complexity and production costs if thixotropic agents are added

None of the existing technologies is aimed at preparing a flame-retardant one-component room temperature vulcanizing silicone sealant

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