Proportional bi-component condensed type organic silicon sealant stable in storage and preparation method thereof

Abstract

The invention discloses a proportional bi-component condensed type organic silicon sealant stable in storage and a preparation method thereof. The organic silicon sealant is characterized by comprising the following steps: adding 50-100 parts by mass of alpha, omega-dyhydroxy polydimethylsiloxane, 20-60 parts by mass of activated calcium carbonate into a high-speed dispersing and stirring machine, stirring for 60-120min under the conditions that the vacuum degree is 0.08-0.099MPa and the rotating speed is 400-800r / min, continuing stirring for 10-30min under the pressure being 0.08-0.099MPa to obtain a component A; and adding 60-100 parts by mass of base material of a component B, 5-40 parts by mass of multi-alkoxy silicon-based end-blocking polydimethylsiloxane, 10-30 parts by mass of alpha, omega-dyhydroxy polydimethylsiloxane, 5-15 parts by mass of cross-linking agent, 1-5 parts of coupling agent and 0.01-0.1 part by mass of catalyst into the high-speed dispersing and stirring machine, stirring for 60-120min under the conditions that the vacuum degree is 0.08-0.099MPa and the rotating speed is 400-800r / min, continuing stirring for 10-30min under the pressure being 0.08-0.099MPa to obtain a component B. In application, the component A and the component B are mixed according to the mass ratio being 1:1.

Description

Technical field: [0001] The invention relates to a storage-stable equal-proportion two-component condensation type silicone sealant and a preparation method thereof, belonging to the field of polymer room temperature vulcanized silicone sealants. technical background: [0002] Silicone sealants have excellent weather resistance, UV resistance, high and low temperature resistance, good hydrophobic properties and excellent electrical insulation properties, and can still maintain good physical properties in harsh environments, so they are widely used in construction, Electronic appliances, automobiles, new energy and other fields. [0003] With the development of social economy, all walks of life pay more attention to the stability of production efficiency and product quality, and put forward higher requirements for silicone sealants. Two-component silicone sealant is widely used in the bonding and sealing of continuous large-scale production industries because of its characte...

AI Technical Summary

Problems solved by technology

The condensation-type two-component room temperature vulcanizing silicone sealant in the existing market has a mixing ratio of 6:1 to 20:1, which requires high measurement accuracy of the mixing equipment during use, and when the mixing ratio fluctuates, it is easy to cause organic The performance of silicone sealant is unstable, and even does not cure, which has great limitations in application; although it is better for ordinary substrates such as aluminum and glass, it is not suitable for bonding polypropylene (PP) ), polycarbonate (PC) and other difficult-to-bond materials need to use primer, which not only adds an additional construction process, but also increases the cost, and the application in these fields is limited

Chinese patent CN101717582A discloses a two-component room temperature vulcanized silicone rubber for photovoltaic use. Formed silicone fireproof electronic potting glue and its preparation method, the mixing ratio of the potting glue is A:B=1:1, no pollution to the substrate, no research on the adhesion problem; due to the addition of silicon Platinum catalyst is used for rubber, which is easy to be poisoned, and its application in many places is limited; therefore, it is necessary to develop a mixing equipment that does not require high metering accuracy and has good adhesion to difficult-to-stick materials such as polypropylene (PP) and polycarbonate (PC). Silicone sealant with adhesive performance is imminent

Images