Surface modified calcium carbonate and preparation method thereof

A technology of surface modification and surface modifier, applied in the field of calcium carbonate, can solve the problems of unsatisfactory modification effect, stay in the research stage, few action points, etc. Effect

Inactive Publication Date: 2013-03-20
ZHANGJIAJIE HENGLIANG MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many types of calcium carbonate surface modifiers, but due to the complicated process and high cost, most of them only stay in the research stage
At present, the most widely used is stearic acid, which contains only one carboxyl group in its molecule, and has few action points. When modifying calcium carbonate, it is mostly physical action, and the coating is not firm and easy to fall off, so the modification effect is not ideal.

Method used

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  • Surface modified calcium carbonate and preparation method thereof
  • Surface modified calcium carbonate and preparation method thereof
  • Surface modified calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 2.5g of tung oil anhydride in 5ml of acetone to form an acetone solution, add 100g of light calcium carbonate aqueous suspension into a high-speed dispersing mixer, add the acetone solution of tung oil anhydride at 80°C, mix well, stir and coat After 30 minutes, dehydration, drying, crushing and sieving are carried out after the coating is completed, and the modified light calcium carbonate is obtained, and the activation degree is >99%.

Embodiment 2

[0018] Add 100g of heavy calcium carbonate dry powder into a high-speed disperser, add 2.0g of oleic acid at 100°C, fully mix and coat for 20 minutes, dry, pulverize, and sieve after coating to obtain modified heavy calcium carbonate calcium carbonate.

[0019] Table 1 Modification effects of modifiers

[0020]

[0021] Table 1 shows that its activation rate of the modified calcium carbonate obtained in Example 2 reaches 95%, and the calcium carbonate surface has changed from hydrophilic to hydrophobic.

[0022] Unmodified heavy calcium carbonate is easy to agglomerate, unevenly dispersed, the gap between particles is large, and the oil absorption value is high; the modified calcium carbonate penetrates into the interior of the particles or covers the surface due to the coating of a modifier on the surface. The gap between the particles is reduced, the bulk density is reduced, and the oil absorption value is reduced.

[0023] Unmodified heavy calcium carbonate is not easy...

Embodiment 3

[0026] Dissolve 1.5g of citric acid anhydride in 5ml of acetone to form an acetone solution. Add 100g of heavy calcium carbonate dry powder into the high-speed disperser, add the acetone solution of citronic anhydride at 50°C, mix and coat thoroughly for 20 minutes, after the coating is completed, dry, pulverize, and sieve to obtain the modified product. of heavy calcium carbonate.

[0027] The activation degree is more than 95%, the oil absorption value is 28.29ml / 100g, the contact angle of water on it is 99°, and the viscosity drop rate of the liquid paraffin suspension is 55% of the unmodified one. It shows that the surface of modified calcium carbonate has changed from hydrophilic to hydrophobic, and its dispersibility is greatly improved, and the degree of particle agglomeration is reduced.

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Abstract

The invention relates to surface modified calcium carbonate and a preparation method thereof. The surface modified calcium carbonate is prepared by adding tung oil series of derivative modifiers or acetone solution of the modifier into heavy calcium carbonate dry power or light calcium carbonate water suspension for coating for 10-30 minutes at 30-100 DEG C, with the modifier or acetone solution of the modifier being 0.5-2.5 weight percent of the calcium carbonate. The tung oil series of derivative biological surface modifiers used in the invention is renewable resource; the production processis easy to popularize and implement with low cost and no pollution. The modifier contains a carboxyl which can be chemically combined with calcium ions on the surface of calcium carbonate, so that the surface of the calcium carbonate is changed from hydrophilicity to hydrophobicity to enhance the action between the calcium carbonate and interface of polymers; unsaturated bonds of the modifier plays a role of crosslinking during polymer processing; and the modified calcium carbonate can be used for filling plastic, rubber, adhesive and the like, improves the toughness of composite material, reduces the production cost and has wide application prospect on the basis of ensuring the mechanical strength.

Description

technical field [0001] The invention relates to a calcium carbonate, in particular to a surface-modified calcium carbonate and a preparation method thereof. Background technique [0002] Due to its good stability, pure color, low wear, easy processing, non-toxicity, wide range of sources, low price and many other advantages, calcium carbonate is often used to fill plastics, rubber and other materials to increase capacity, increase and reduce production costs. However, because its surface is hydrophilic and oleophobic and is easy to agglomerate, it has different interfacial properties with organic polymers and poor compatibility. Direct or excessive filling will easily lead to a decrease in the mechanical properties of the material. Through surface modification, its surface properties can be improved, and the comprehensive properties such as dispersibility, compatibility with the polymer interface and mechanical strength of the material can be improved. There are many kinds ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/08C08K9/04C08K3/26C09J11/06C09J11/04
Inventor 邓剑如刘祥毛萃
Owner ZHANGJIAJIE HENGLIANG MINING
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