Practical method for preparing high thixotropy surface treating nano calcium carbonate

A technology of nano-calcium carbonate and surface treatment, which is applied in the treatment of low-molecular-weight organic compounds in dyeing, etc. It can solve the problems of poor dispersion of surface-treated nano-calcium carbonate, complex components of surface treatment agents, and complicated processes, and achieve significant economic and social benefits. , a wide range of product applications and simple preparation procedures

Inactive Publication Date: 2009-07-08
山东海泽纳米材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a practical method for preparing surface-treated nano-calcium carbonate with high thixotropy in view of the short...

Method used

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Experimental program
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Embodiment 1

[0027] After the limestone is cleaned, it is calcined at 950°C and digested with water at 80°C to obtain 8% Ca(OH) 2 Slurry, transferred to the membrane dispersion carbonization reactor, adding 0.5% (relative to Ca(OH) 2 ) of beet sugar. Introduce 30% (v) of CO 2 Carry out carbonization at 17°C, when the pH drops to 6.8, continue aeration for 5 minutes to obtain 11% nano-CaCO 3 Protoplasm (3hr apparent sedimentation volume of 100ml protoplasm is 96mL, powder specific surface area after drying is 28m 2 / g). Heat the original slurry, raise the temperature to 75°C and stir for 30min. Weigh 3.7% (relative to CaCO 3 ) fatty acid and 7% (relative to fatty acid) caustic soda, saponified at 80° C. for 10 min to obtain 20% saponified liquid, which was transferred to the hot slurry, and modified for 1 hr while insulated and stirred. Finally, it is filtered, dried, pulverized, classified and bagged.

Embodiment 2

[0029] After the limestone is cleaned, it is calcined at 1000°C, and then digested with water at 90°C to obtain 8% Ca(OH) 2 Slurry, transferred to the membrane dispersion carbonization reactor, adding 1.0% (relative to Ca(OH) 2 ) of sucrose. Introduce 35% (v) of CO 2 Carry out carbonization at 15°C, and when the pH drops to 6.8, continue aeration for 5 minutes to obtain 12% nano-CaCO 3 Protoplasm (3hr apparent sedimentation volume of 100mL protoplasm is 98mL, powder specific surface area after drying is 29m 2 / g). Heat the original slurry to 75°C and stir for 30 minutes. Weigh 3.4% (relative to CaCO 3 ) fatty acid and 8% (relative to fatty acid) caustic soda, saponified at 80° C. for 15 minutes to obtain 15 percent saponified liquid, which was transferred to the hot slurry, and modified for 1 hr while insulated and stirred. Finally, it is filtered, dried, pulverized, classified and bagged.

Embodiment 3

[0031] After the limestone is cleaned, it is calcined at 950°C and digested with water at 75°C to obtain 6% Ca(OH) 2 Slurry, transferred to the film dispersion carbonization reactor, add 0.6% (relative to Ca(OH) 2 ) of beet sugar and sucrose 1:1 mixture, 28% (v) of CO 2 Carry out carbonization at 20°C, and when the pH drops to 6.8, continue aeration for 5 minutes to obtain nano-CaCO 3 Protoplasm (3hr apparent sedimentation volume of 100mL protoplasm is 96mL, powder specific surface area after drying is 25m 2 / g). Heat the original slurry to 70°C and stir for 30 minutes. Weigh 3.1% (relative to CaCO 3 ) fatty acid and 6% (relative to fatty acid) caustic soda, saponified at 85° C. for 10 minutes to obtain a 23 percent saponified liquid, which was transferred to a hot slurry, and modified for 45 minutes while insulated and stirred. Finally, it is filtered, dried, pulverized, classified and bagged.

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Abstract

The invention discloses a practical method for preparing high-thixotropy surface treatment nano calcium carbonate, which comprises the following steps: firstly, calcining and digesting preferable limestone, and then controlling carbonization of the limestone in a special reactor to obtain nano calcium carbonate primary slurry; secondly, carrying out surface treatment on the nano calcium carbonate according to practical and special control technology; and finally dehydrating, drying, crushing and grading the coated slurry. The shape of the obtained calcium carbonate is cubic, the particle diameter is 50 to 100 nanometers, and the specific surface area is 20 to 40 m/g. The obtained powder has good dispersion effect and thixotropy, is suitable for occasions needing high thixotropy, such as high-performance silicone adhesive, epoxy adhesive, polysulfide adhesive, polyurethane adhesive, automotive primary coat, floor coating and the like, and has wide market prospect. The method has simple raw materials and process requirement, stabalizes the production and reduces the cost.

Description

technical field [0001] The invention belongs to the technical field of preparation of surface-treated nano-calcium carbonate, and relates to an organic / inorganic composite functional nano-calcium carbonate powder material used in the fields of adhesives, sealants and coatings, specifically a practical method for preparing highly thixotropic surfaces The method for processing nanometer calcium carbonate. 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, sizing materials, coatings, and papermaking. 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 the three major synthetic materials of rubber, plastic and fiber. The use...

Claims

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Application Information

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IPC IPC(8): C09C3/08C08K3/26
Inventor 吴国华王莉萍史献峰陈祥芝徐西庆徐铸德
Owner 山东海泽纳米材料有限公司
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