One-component room temperature vulcanized silicone rubber and preparation method

Abstract

The invention discloses one-component room temperature vulcanization silicone rubber with a simple process and a preparation method thereof, and relates to the field of room temperature vulcanized silicone rubber. The one-component room temperature vulcanized silicone rubber is prepared from, by mass, 100 parts of hydroxyl terminated polyorganosiloxane alkane, 25-35 parts of silicone oil, 70-100 parts of a heavy filler, 5-15 parts of fumed silica, 0.1-0.3 part of a water remover, 6-14 parts of a cross-linking agent, 1.7-4 parts of a silane coupling agent and 0.01-0.09 part of dibutyl tin dilaurate. The preparation method of the one-component room temperature vulcanized silicone rubber adopts a formula design and raw material selection, uses powder with a low water content rate to interactwith the low-active cross-linking agent, and achieves high-temperature dehydration, the whole production process time is greatly shortened, the process is very simple, large-scale production is easilyachieved, and the storage stability is equal to a high temperature dehydration process.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to a one-component room temperature vulcanized silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber has excellent weather resistance, high and low temperature resistance, high hydrophobicity and good air permeability, etc., and can be used for a long time in the range of -60 ~ 260 ° C, safe and reliable, and has a long service life, so it is widely used in construction , electronics, machinery manufacturing, automobiles and other industrial fields. [0003] For a long time, the preparation process of one-component room temperature vulcanized silicone rubber has been relatively complicated, and it must be dehydrated under high-temperature vacuum for 3 hours to remove the moisture in the powder and ensure the storage stability of the sealant. However, this process has a long process cycle and high temperature. After heating, the base material ...

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Problems solved by technology

[0003] For a long time, the preparation process of one-component room temperature vulcanized silicone rubber has been relatively complicated, and it must be dehydrated under high-temperature vacuum for 3 hours to remove the moisture in the powder and ensure the storage stability of the sealant. However, this process has a long process cycle and high temperature. After heating, the base material is obtained, and the high temperature needs to be lowered to room temperature through cooling water before the next step of preparation can be carried out, which is time-consuming and laborious, and consumes energy such as water, electricity, and heat

[0004] Related solutions of room temperature vulcanized silicone rubber have also appeared in the prior art. Its flexibility and elongation are better than ordinary vulcanized silicone rubber, but it generally has the problem of low tensile strength due to its small cohesive force; at the same time, its The storage stability is much lower than that of vulcanized silicone rubber treated at high temperature. Generally, after the product is stored at room temperature for several months, the performance of the product will decline significantly.

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