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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

Inactive Publication Date: 2012-06-13
广东嘉维化工实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there is an urgent need to research and develop a new product method that can be used for high-grade silicone rubber structural sealant filling, and completely solve the low-grade product CC made into glue with insufficient tensile strength and elongation, poor dispersion, and thixotropy. Insufficient leveling, poor production stability and other technical problems, in order to achieve the purpose of quickly occupying the market

Method used

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

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Embodiment

[0022] Embodiment: the preparation method of nano-calcium carbonate SCC-2 special for silicone sealants, using limestone as raw material, first crush the large limestone into limestone with a particle size of 75-150mm, and then mix it with anthracite with a particle size of 20-40mm The coal blending ratio (100:12~100:15), a certain interval (2h), and a certain total amount (determined by the production capacity) are added to the lime kiln or muffle furnace for calcination reaction with air, and the air is required ( The excess air coefficient is 1.05—1.10) from the lime kiln or muffle furnace (forced ventilation or natural ventilation), and the generated lime is produced at a certain interval (2h, in coordination with the feeding, feeding first and then harvesting), a certain temperature (60-80°C) from the bottom of the lime kiln, CO 2 Then continuously press a certain temperature (120-150°C) to leave the kiln from the top of the lime kiln.

[0023] The lime from the bottom o...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18B82Y40/00
Inventor 陈品维梁立和梁永财徐裕森吴东
Owner 广东嘉维化工实业有限公司
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