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Modified nanometer calcium carbonate and method for making same and uses

A nano-calcium carbonate and modified technology, applied in the field of nano-materials, can solve the problems of difficult industrialization and high cost, achieve broad industrial application prospects, reduce agglomeration, and enhance the effect of hydrophobicity

Inactive Publication Date: 2006-07-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other modification methods are still rarely seen in industrial applications, mainly because of high cost or difficulty in industrialization

Method used

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  • Modified nanometer calcium carbonate and method for making same and uses
  • Modified nanometer calcium carbonate and method for making same and uses
  • Modified nanometer calcium carbonate and method for making same and uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 8.8 grams of triethylene glycol monocinnamate (A) to 100 grams of nano-calcium carbonate dry powder, and react with high-speed stirring in a flask at 100° C. for 1 hour. Cool to room temperature to obtain modified nano-calcium carbonate A-CaCO 3 .

[0030] After the modified nano-calcium carbonate and the unmodified nano-calcium carbonate are extracted by organic solvent, the infrared spectrum test is carried out, such as figure 1 As shown, organic group peaks still appear after the extraction of modified nano-calcium carbonate, and the infrared spectra of unmodified nano-calcium carbonate after extraction are completely consistent, indicating that the organic matter on the surface of modified calcium carbonate forms a chemical combination with calcium carbonate, while There is no change on the surface of unmodified calcium carbonate.

[0031] Unmodified nano calcium carbonate (U-CaCO 3 ) The sedimentation volume in liquid paraffin hardly changes within 72 hours....

Embodiment 2

[0034] Add 6 grams of butyl linoleate (B) to the aqueous suspension containing 100 grams of nano-calcium carbonate, and react with high-speed stirring in a flask at room temperature for 0.5 hours. Cool to room temperature to obtain modified nano calcium carbonate B-CaCO 3 .

[0035] Add B-CaCO to 100 parts of PVC resin respectively 3 and U-CaCO 3 30 parts, 5 parts of rare earth calcium zinc stabilizer, kneaded evenly, kneaded and plasticized on a Φ160 double-roller open mill, the kneading temperature was 175°C, after the kneading was uniform, the heated hydraulic flat press was used to mold the sample. The molding temperature was 180°C. After cooling, the sample was cut with a universal sample making machine, and the mechanical properties were tested. The results are shown in Table 1.

[0036] sample

Tensile strength (MPa)

Impact strength (kJ / m 2 )

Bending strength (MPa)

Flexural modulus (MPa)

PVC / B-CaCO 3

PVC / U-CaCO 3

pvc

...

Embodiment 3

[0040] Add 1 gram of castor oil (C) to 100 grams of nano-calcium carbonate dry powder, and react with high-speed stirring in a flask at 100° C. for 5 hours. Cool to room temperature to obtain modified nano calcium carbonate C-CaCO 3 .

[0041] Prepare PVC / C-CaCO by the formula of embodiment 2 and process condition 3 The nanocomposites were measured and their mechanical properties are listed in Table 2.

[0042] sample

[0043] Table 2 shows that adding modified nano-calcium carbonate C-CaCO3 to PVC resin can greatly improve the impact strength and flexural modulus of the composite material with a small increase in tensile strength and flexural strength.

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Abstract

This invention is related to modified nanocalcium carbonate and method for making same. According to this method, 1-30 lots unsaturated fatty acid and its derivatives were added to 100 weight lots nanocalcium carbonate or stearic acid modified nanocalcium carbonate dry powder or water suspension that contains 100 weight lots nanocalcium carbonate, react for 0. 5-5 hours at the temperature of nomal-130deg C, then modified nanocalcium carbonate is achieved. A zone of unsaturated fatty acid and its derivatives is coated on the product surface, which chemisorbs with nanocalcium carbonate, this buildups the drainability of nanocalcium carbonate surface. So it is easy to diffuse in polymers, and this can reduce reunition of nanoparticle and buildup the interfacial effort and advance the total property of nanocomposite material. Modified nanocalcium carbonate could be used in every polymer manufacturing polymer / inorganic nanocomposite material. It can be used to manufacture all kinds of plastic products, cured rubber, coating, binder, water-proofing material, and so on, and its industry application foreground is very broad.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a modified nano calcium carbonate and a preparation method thereof. Background technique [0002] The main feature of nanocomposites (Nanocomposites) is that one or more components in the composite system are uniformly dispersed in the matrix of another component in at least one dimension with a nanometer size (≤100nm). The polymer / inorganic nanocomposite material composed of polymer and some inorganic nanopowders has a uniform and firm bond between the polymer and the inorganic particles with a nanometer-sized structure. The nanometer has a large surface area and a small interphase distance. , there is a special interaction, so its performance is significantly improved compared with the corresponding macro or micro-scale composite materials (for example, traditional inorganic filler-filled modified polymers), and even a qualitative leap occurs, showing brand-new properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C08K3/26
Inventor 古菊贾德民罗远芳
Owner SOUTH CHINA UNIV OF TECH
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