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Calcium carbonate surface modifying method

A technology of surface modification and calcium carbonate, which is applied in the treatment of fibrous fillers and dyed low-molecular organic compounds, etc., to achieve the effects of reducing production costs, inhibiting crystal growth, and good dispersion

Inactive Publication Date: 2012-12-26
ZHEJIANG CHANGSHAN JINXIONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in organic-inorganic properties, the direct use of oil molecules for calcium carbonate modification also faces the problems of compatibility and solubility in water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1000g of slurry after carbonation reaction of light calcium carbonate contains 200g of solid calcium carbonate. The surface treatment agent is: 1.6g palm oil, 0.16g cosolvent diethylene glycol monobutyl ether; palm oil mainly contains unsaturated fatty acid glycerides of C16 and C18; the weight percentage of palm oil relative to the finished product modified calcium carbonate is 0.8 %; The weight ratio of diethylene glycol monobutyl ether relative to palm oil is 10%. At room temperature, the surface treatment agent was added to the calcium carbonate slurry, and stirred at a stirring rate of 500 rpm for 2 hours. After the reaction, the reaction slurry is dehydrated, dried, pulverized and packaged to obtain the finished product. The oil absorption value of calcium carbonate after modification was determined to be 30mL / 100g, which was 40mL / 100g lower than the oil absorption value of calcium carbonate before modification (70mL / 100g). The activation degree of calcium carbo...

Embodiment 2

[0025] 1000g of slurry after carbonation reaction of precipitated calcium carbonate contains 200g of solid calcium carbonate. Surface treatment agent is: 6.0g coconut oil, 3.0g cosolvent ethylene glycol monobutyl ether; Coconut oil mainly contains the unsaturated fatty acid glyceride of C12 and C14; Coconut oil is calculated as 3% by weight relative to finished product modified calcium carbonate ; Ethylene glycol monobutyl ether is 50% with respect to the weight ratio of coconut oil. At room temperature, the surface treatment agent was added to the above calcium carbonate slurry, and stirred at a stirring rate of 800 rpm for 1 hour. After the reaction, the reaction slurry is dehydrated, dried, pulverized and packaged to obtain the finished product. The oil absorption value of calcium carbonate after modification was determined to be 34mL / 100g, which was 37mL / 100g lower than the oil absorption value of calcium carbonate before modification (71mL / 100g). The activation degree o...

Embodiment 3

[0027] 1000g of slurry after carbonation reaction of light calcium carbonate contains 250g of solid calcium carbonate. Surface treatment agent is: 2g coconut oil, 1.75g ​​palm oil, 0.75g cosolvent propylene glycol monomethyl ether; The summation of coconut oil and palm oil is 1.5% relative to the weight percent of finished product modified calcium carbonate; Propylene glycol monomethyl ether is relative to The weight ratio of the sum of coconut oil and palm oil is 20%. At room temperature, the surface treatment agent was added to the above calcium carbonate slurry and stirred at a stirring rate of 1200 rpm for 0.5 hours. After the reaction, the reaction slurry is dehydrated, dried, pulverized and packaged to obtain the finished product. The oil absorption value of calcium carbonate after modification was determined to be 29mL / 100g, which was 46mL / 100g lower than the oil absorption value of calcium carbonate before modification (75mL / 100g). The activation degree of calcium ca...

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Abstract

The invention discloses a calcium carbonate surface modifying method, which comprises the following steps of: adding a surface treatment agent into slurry obtained after the carbonation reaction of light calcium carbonate or precipitated calcium carbonate, wherein the treatment agent consists of unsaturated long carbon chain plant oil and a cosolvent; stirring at a high speed of 500 to 1,200rpm for 0.5 to 2h to perform surface treatment on the calcium carbonate; and obtaining the finished product of modified calcium carbonate by dewatering, drying, crushing and packaging the calcium carbonate emulsion after the reaction. The surface treatment agent of the invention has high dispersion in water at normal temperature, uniformly acts on the surfaces of calcium carbonate grains under the action of a high-speed shearing force, physical absorption and the hydroxyl on the calcium carbonate surface and restrains the crystal growth and secondary aggregation of the calcium carbonate, so that the modified calcium carbonate has uniform aperture, high dispersion, high affinity with organic high polymer and high filling property. In the invention, when the liquid surface treatment agent is used, the modification reaction process of the calcium carbonate needs no heating and is low in energy consumption and environmentally-friendly.

Description

technical field [0001] The invention relates to a method for surface modification of calcium carbonate, in particular to a method suitable for surface modification of calcium carbonate at room temperature. Background technique [0002] Calcium carbonate is an important inorganic chemical product, which is widely used in industries such as rubber, plastics, paper, paint, ink, and medicine. With the specialization and nanometerization of calcium carbonate particles, its own defects greatly limit its application: one is CaCO 3 The smaller the particle size, the more atoms on the surface, the higher the surface energy, the stronger the adsorption, and the mutual agglomeration between the particles; the second is CaCO 3 As an inorganic filler, the particle surface is hydrophilic and oleophobic, has poor affinity with organic polymers, and is easy to form aggregates, resulting in internal defects and poor mechanical properties of the polymer. In order to improve the filling perf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/08
Inventor 张仁瀚周志胜岳林海金达莱
Owner ZHEJIANG CHANGSHAN JINXIONG
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