Preparation method of nano-calcium carbonate SCC-2 special for silicone sealant

A silicone sealant, SCC-2 technology, applied in the direction of calcium carbonate/strontium/barium, nanotechnology, etc., can solve the problems of poor dispersion, poor thixotropy and leveling, poor production stability, etc., to optimize processing performance , the effect of excellent thixotropic properties and anti-sag properties
CN102491397AInactive Publication Date: 2012-06-13广东嘉维化工实业有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
广东嘉维化工实业有限公司
Publication Date
2012-06-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of nano-calcium carbonate SCC-2 special for a silicone sealant, belonging to the technical field of inorganic chemical industry. According to an adopted technical scheme, the method comprises the following steps of: calcining limestone, crushing to obtain CaO; digesting, refining and aging the CaO in a hot state in the ratio of 1:4.8 of CaO to H2O; adding 1 percent of white granulated sugar crystal form control agent for undergoing a carbonation reaction to obtain CaCO3 slurry; performing activation surface treatment; and dehydrating, drying, crushing and degrading to obtain a nano-active CaCO3 product of 60-100 nanometers. The crystal form, size, regularity, oil absorption value and pH value of CaCO3 are controlled, so that 'hard aggregation' among particles is avoided from a surface modification production process, and the product has low oil absorption value and high bulk specific weight and has high dispersity in polymers.
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Description

technical field

[0001] The invention belongs to the technical field of inorganic chemical industry, in particular to a preparation method of nano calcium carbonate SCC-2 specially used for silicone sealants. Background technique

[0002] Silicone sealant is a part of silicone products. It has strong adhesive force and high tensile strength. It depends on the moisture in the air to cure into an excellent, durable high-modulus, high-elastic silicone sealant. Fully cured silicone The glass glue can still remain effective when used at a temperature of 204°C (400oF), so it has excellent aging resistance and long-lasting performance. Nano-CaCO3 is an inorganic filler with rich raw materials and excellent performance. It can partially or mostly replace carbon black and white carbon black as a reinforcing filler for silicone rubber, which can reduce costs, and has the advantages of large filling volume, reinforcement, and reinforcement. With the characteristics of good whitening ef...

Claims

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