High-dispersion composite modified heavy calcium carbonate and preparation method thereof

A heavy calcium carbonate, composite modification technology, applied in the treatment of dyeing high molecular organic compounds, chemical instruments and methods, dyeing low molecular organic compounds and other directions, can solve problems such as single modification effect, reduce production costs, Enhance the effect of modification and have broad application prospects

Active Publication Date: 2020-10-13
HUBEI UNIV FOR NATITIES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although there are many reports on the modification of heavy calcium carbonate in the prior art, most of them use a modifier or only have a single modification effect.

Method used

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  • High-dispersion composite modified heavy calcium carbonate and preparation method thereof
  • High-dispersion composite modified heavy calcium carbonate and preparation method thereof
  • High-dispersion composite modified heavy calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The high-dispersion composite modified ground calcium carbonate provided in this example is prepared by using heavy calcium carbonate raw ore produced in Xianfeng County, and using polymethyl methacrylate emulsion as a modifier.

[0045] The above-mentioned highly dispersed composite modified ground calcium carbonate of the present embodiment is obtained by the following method, and the steps are as follows:

[0046](1) Add 0.5 g of polyvinyl alcohol powder into 100 mL of water, heat to 65° C. to completely dissolve the polyvinyl alcohol, and obtain an aqueous solution of polyvinyl alcohol with a concentration of 0.5% by mass; Add emulsifier sodium lauryl sulfate (its consumption is 8% of the mass of methyl methacrylate monomer) and methyl methacrylate monomer 45mL successively, the gained mixture is heated up to 80 ℃, under stirring condition again to Add 1.5 mL of ammonium persulfate solution with a concentration of 1 mol / L to the reaction system dropwise. After the d...

Embodiment 2

[0056] The high-dispersion composite modified ground calcium carbonate provided in this example is prepared from heavy calcium carbonate raw ore produced in Xianfeng County, using polymethyl methacrylate emulsion and stearic acid as modifiers.

[0057] The above-mentioned highly dispersed composite modified ground calcium carbonate of the present embodiment is obtained by the following method, and the steps are as follows:

[0058] (1) Add 0.3g of polyvinyl alcohol powder into 100mL of water, heat to 70°C to completely dissolve the polyvinyl alcohol, and obtain an aqueous solution of polyvinyl alcohol with a concentration of 0.3% by mass; Add emulsifier sodium lauryl sulfate (its consumption is 8% of the mass of methyl methacrylate monomer) and methyl methacrylate monomer 42mL successively, the gained mixture is heated up to 80 ℃, under stirring condition again to 1.5 mL of 1 mol / L ammonium persulfate solution was added dropwise to the reaction system. After the dropwise addit...

Embodiment 3

[0066] The high-dispersion composite modified ground calcium carbonate provided in this example adopts heavy calcium carbonate produced in Xianfeng County, and uses polymethyl methacrylate emulsion and titanate as modifiers.

[0067] The above-mentioned highly dispersed composite modified ground calcium carbonate of the present embodiment is obtained by the following method, and the steps are as follows:

[0068] (1) Add 0.3g of polyvinyl alcohol powder into 100mL of water, heat to 60°C to completely dissolve the polyvinyl alcohol, and obtain an aqueous solution of polyvinyl alcohol with a concentration of 0.3% by mass; then add it to the aqueous solution of polyvinyl alcohol Add emulsifier sodium lauryl sulfate (its consumption is 8% of the mass of methyl methacrylate monomer) and methyl methacrylate monomer 45mL successively, the gained mixture is heated up to 80 ℃, under stirring condition again to 2.5 mL of 1 mol / L ammonium persulfate solution was added dropwise to the rea...

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Abstract

The invention discloses high-dispersion composite modified ground calcium carbonate and a preparation method thereof, and belongs to the technical field of powder modification. The method specificallycomprises the following steps: firstly, putting heavy calcium carbonate into a drying oven and dehydrating at 100-110 DEG C; mixing the heavy calcium carbonate with a polymethyl methacrylate emulsionby using an electric stirrer, wherein the dosage of the polymethyl methacrylate is 2.0-4.0% of the mass of the heavy calcium carbonate; and adding a secondary modifier (such as any one of stearic acid, titanate and sodium tripolyphosphate), and electrically stirring at 80-85 DEG C for 40-120 minutes to obtain the high-dispersion modified heavy calcium carbonate powder. The prepared modified heavycalcium carbonate is good in dispersity, the surface zeta potential is larger than 29.8 mV, the average particle size is not larger than 500 nm, the activation rate is larger than 90.8%, and the oilabsorption value is smaller than 0.30 ml / g. The high-dispersion modified heavy calcium carbonate powder prepared by the invention has the main characteristics of high dispersion and high activation rate, and can be used in the field of polymer composite materials.

Description

technical field [0001] The invention belongs to the technical field of powder modification, and relates to the dispersion and modification of heavy calcium carbonate. More specifically, the invention relates to a high-dispersion composite modified heavy calcium carbonate and a preparation method thereof. Background technique [0002] As an important non-metallic filler, heavy calcium carbonate has the characteristics of simple processing and low price. It is widely used in rubber, papermaking, plastics, construction, coatings and other industries. It can improve the heat resistance, mechanical properties and wear resistance of products. sex etc. However, when heavy calcium carbonate is directly compounded with a polymer matrix, there are powder agglomerations caused by intermolecular forces, electrostatic interactions, hydrogen bonds, etc., and the surface of heavy calcium carbonate is hydrophilic, which has poor compatibility with organic polymers. Greatly affect the produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/06C09C3/08C09C3/10C08F120/14
CPCC01P2004/62C01P2006/19C01P2006/22C08F120/14C09C1/021C09C3/006C09C3/06C09C3/08C09C3/10
Inventor 胡盛胡卫兵莫汉林谢岚浩冯驸刘佳衡周红艳李国祥
Owner HUBEI UNIV FOR NATITIES
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