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Method for preparing nano calcium carbonate with low viscosity and medium thixotropic property

A nano-calcium carbonate, low-viscosity technology, applied in the treatment of dyed low-molecular-weight organic compounds, dyed high-molecular organic compounds, fibrous fillers, etc. problems, to achieve the effect of good product dispersion, reasonable process, and easy control of the production process

Inactive Publication Date: 2011-02-09
山东海泽纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing surface modification treatment of nano-calcium carbonate generally has disadvantages such as poor dispersion performance, poor thixotropy, high viscosity, complex surface treatment agent composition, complex process and high cost.

Method used

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  • Method for preparing nano calcium carbonate with low viscosity and medium thixotropic property
  • Method for preparing nano calcium carbonate with low viscosity and medium thixotropic property
  • Method for preparing nano calcium carbonate with low viscosity and medium thixotropic property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After the limestone is cleaned, it is transferred to the kiln, calcined at 1000°C, and digested with water at 80°C to obtain 10% Ca(OH) 2 slurry; the Ca(OH) 2 Put the slurry into a proprietary membrane dispersion carbonization reactor, add 1.5% crystal form control agent, and pass through 30% (v) CO 2 Control the temperature at 20°C for carbonization. When the pH value drops to 6.8, continue to ventilate for 8 minutes to obtain the original slurry of nano-calcium carbonate, and ensure that the apparent sedimentation volume of each 100ml slurry is 85-99ml in three hours. Add 8% (accounting for fatty acid) caustic soda and saponification in 70°C water to 3% (accounting for dry basis nano-calcium carbonate) fatty acid, react for 20min, form 6% saponification liquid, add 2% (accounting for dry basis) to the above-mentioned saponification liquid Nano calcium carbonate) polyester dispersant; the specific surface area of ​​the powder after drying is preferably 20-40m 2 / g sl...

Embodiment 2

[0027] After the limestone is cleaned, it is transferred to the kiln, calcined at 1200°C, and digested with water at 100°C to obtain 15% Ca(OH) 2 slurry; the Ca(OH) 2 Put the slurry into a proprietary membrane dispersion carbonization reactor, add 2.5% sugar crystal form control agent sucrose, beet sugar, maltose or a mixture of more than one, and pass through 50% (v) CO 2 Control the temperature at 30°C for carbonization. When the pH value drops to 7.0, continue to ventilate for 10 minutes to obtain the original slurry of nano-calcium carbonate, and ensure that the apparent sedimentation volume per 100ml of slurry is 85-99ml in three hours. Add 14% (accounting for fatty acid) caustic soda and saponification in 80°C water to 6% (accounting for dry basis nano-calcium carbonate) fatty acid, react for 30min, form 1% saponification liquid, add 0.1% (accounting for dry basis) to the above saponification liquid Nano calcium carbonate) polyester dispersant; the specific surface area...

Embodiment 3

[0029] After the limestone is cleaned, it is transferred to the kiln, calcined at 800°C, and digested with water at 70°C to obtain 5% Ca(OH) 2 slurry; the Ca(OH) 2 Put the slurry into a proprietary membrane dispersion carbonization reactor, add 0.1% crystal form control agent, and pass through 15% (v) CO 2 Control the temperature at 5°C for carbonization. When the pH value drops to 6.5, continue to ventilate for 5 minutes to obtain the original slurry of nano-calcium carbonate, and ensure that the apparent sedimentation volume per 100ml of slurry is 85-99ml in three hours. Add 5% (accounting for fatty acid) caustic soda and saponification in 60°C water to 0.5% (accounting for dry basis nano-calcium carbonate) fatty acid, react for 10min, form 10% saponification liquid, add 10% (accounting for dry basis) to the above saponification liquid Nano calcium carbonate) polyester dispersant; the specific surface area of ​​the powder after drying is preferably 20-40m 2 / g slurry, heat...

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Abstract

The invention discloses a method for preparing nano calcium carbonate with low viscosity and medium thixotropic property, which comprises the following steps of: calcining and slaking preferred limestone, then controlling carbonization in a membrane reactor to obtain raw nano calcium carbonate slurry, performing composite surface modification treatment on the nano calcium carbonate by using polyester dispersant and fatty acid (or sodium salt), and finally dehydrating, drying, crushing and grading the wrapped slurry. The obtained powder has good dispersion performance, low viscosity and medium thixotropic property, and is suitable for situations with different requirements such as high-performance silicone adhesive, epoxy glue, polysulfide glue, polyurethane glue, automobile prime coat, floor patient and the like. The method has remarkable advantages of easily obtained raw materials, simple process requirement, low production cost and the like, and is easy to control the production process.

Description

technical field [0001] The invention belongs to the technical field of preparation of surface modified nano-calcium carbonate, and in particular relates to a method for preparing nano-calcium carbonate with low viscosity and medium thixotropic performance, which is used for organic / inorganic composite functions in the fields of adhesives, sealants and coatings Nano calcium carbonate powder material. Background technique [0002] Calcium Carbonate (CaCO 3 ) powder is an important inorganic chemical product. As a powder additive, it can be widely used in industries such as rubber, plastics, adhesives & sealants, coatings and papermaking. It usually acts as a filler to increase product volume and reduce costs. Among them, heavy calcium carbonate and ordinary light calcium carbonate are just conventional bulk fillers. Nanoscale inorganic particle / polymer composite material is a new type of material with important application value in nanomaterials. It can be widely used in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/08C09C1/02C09C3/10
Inventor 肖建平崔丽丽王卓李常林陈祥芝郭安慧朱孝川
Owner 山东海泽纳米材料有限公司
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