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Ground calcium carbonate powder surface modification method

A heavy calcium powder and modification technology, which is applied in the field of polymer chemistry and physics, can solve problems affecting the performance of composite materials, easy aggregation of nanoparticles, and affecting the use of materials, and achieve excellent performance indicators, simple process, and low cost.

Inactive Publication Date: 2013-12-04
HEZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the heavy calcium powder is filled, it is easy to become the stress center of the material, which affects the use of the material; the nanoparticles are easy to agglomerate, and the surface of the heavy calcium powder can be covered with a layer of modifier to reduce the defects of the two and give full play to the advantages of the two; In addition, the surface of heavy calcium powder is hydrophilic and oleophobic, and its dispersion in organic polymer materials is not good, which will affect the performance of composite materials. Therefore, heavy calcium powder needs to be modified to broaden the application field. Improve application value

Method used

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  • Ground calcium carbonate powder surface modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1 The effect of modifier concentration on the modification of heavy calcium particles

[0084] Toluene is used as the solvent (the solvent is dried by calcium hydride reflux to remove moisture), and the heavy calcium powder is dried at 100°C for 4 hours to remove moisture. The amount of solvent toluene is about 100 parts, and the heavy calcium powder is 10 parts. Maleic anhydride, acrylamide, methyl methacrylate (monomers are all industrial grade) about 0.1 parts in total (1% of the mass of heavy calcium powder), dissolved in a little N,N dimethylformamide (DMF) , and then add it to a reaction eggplant-shaped bottle (protected by inert gas nitrogen), add a polytetrafluoroethylene magnetic stirrer to stir, the temperature should be 80°C, the stirring speed should be 500r / min, and the reaction time should be 90min, filter and vacuum dry to remove The solvent can be used to obtain the active heavy calcium powder after the first modification, in order to prepare a...

Embodiment 2

[0093] Example 2 Effect of Modifier Time on the Modification of Heavy Calcium Particles

[0094] For the first modification reaction conditions, toluene is used as the solvent (the solvent is refluxed and dried with calcium hydride to remove moisture), and the heavy calcium powder is dried at 100°C for 4 hours to remove moisture. The amount of solvent toluene is about 100 parts. 10 parts of heavy calcium powder, monomer maleic anhydride, acrylamide, methyl methacrylate (monomers are all industrial grade) about 0.1 parts (1% of the weight of heavy calcium powder) in total, with a little N, N Methylformamide (DMF) was dissolved, then added to a reaction eggplant-shaped bottle (protected by inert gas nitrogen), and stirred with a polytetrafluoroethylene magnetic stirring bar. The temperature should be 90°C, the stirring speed should be 500r / min, and the reaction time Respectively 60min, 90min, 120min, 150min, 180min, filter, vacuum dry to remove the solvent to obtain the active...

Embodiment 3

[0103] Example 3 Effect of Modification Temperature on the Modification of Heavy Calcium Particles

[0104] For the first modification reaction conditions, toluene is used as the solvent (the solvent is refluxed and dried with calcium hydride to remove moisture), and the heavy calcium powder is dried at 100°C for 4 hours to remove moisture. The amount of solvent toluene is about 100 parts. 10 parts of heavy calcium powder, monomer maleic anhydride, acrylamide, methyl methacrylate (monomers are all industrial grade) about 0.1 parts in total (1% of the weight of heavy calcium powder), with a little N, N Methylformamide (DMF) was dissolved, then added to a reaction eggplant-shaped bottle (protected by inert gas nitrogen), and stirred with a polytetrafluoroethylene magnetic stirring bar, and the reaction temperatures were 75°C, 80°C, 85°C, and 90°C , 95°C, add a modifier with a concentration-mass ratio of 0.2 parts (2% of the heavy calcium powder), the stirring speed is 500r / min...

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Abstract

The invention discloses a modification method for ground calcium carbonate powder (referred to as coarse whiting powder, the same below). The modifying agent of the coarse whiting powder is the composite compatilizer which comprises the components of polymer maleic anhydride-acrylamide-n-butyl methacrylate and stearic acid. Two-time modification is performed, the first modification adopts a wet method about in-situ polymerization with the modifying agent of polymer maleic anhydride-acrylamide-n-butyl methacrylate, and the second modification adopts a dry method with the modifying agent of stearic acid; the brief method comprises the steps as follows: fully mixing the coarse whiting powder, the polymer maleic anhydride-acrylamide-n-butyl methacrylate and the stearic acid, and dissolving the mixture into the mixed liquor formed by liquid paraffin and swill-cooked dirty oil, wherein the total organic matters account for 1 to 3 percent of the coarse whiting powder (mass fraction); the volume ratio of liquid paraffin to swill-cooked dirty oil is 1:1, and mass ratio of the polymer maleic anhydride-acrylamide-n-butyl methacrylate to the stearic acid is 2:1. According to the invention, the active coarse whiting powder can be used as filler of chlorinated polyvinyl chloride, polyvinyl chloride and polyethylene. The active coarse whiting powder is good in dispersion uniformity in the resin, and low in cost, and oriented towards industrialized production.

Description

technical field [0001] The invention belongs to the field of polymer chemistry and physics, and in particular relates to a surface modification method of heavy calcium powder. Background technique [0002] The heavy calcium powder industry has become an important branch of the non-metallic mineral industry. According to statistics from the Calcium Carbonate Special Committee of the China Non-Mining Association, there are nearly a thousand heavy calcium powder production and processing enterprises in my country. According to statistics, in 2013, the production and sales of calcium powder nationwide will increase by 5.26% year-on-year. After nearly 20 years of development in the scale of heavy calcium powder, the production scale has been continuously expanded. [0003] When the heavy calcium powder is filled, it is easy to become the stress center of the material, which affects the use of the material; the nanoparticles are easy to agglomerate, and the surface of the heavy ...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F222/06C08F220/14C09C1/02C09C3/10C08K9/04C08K3/26
Inventor 周国永曾一文罗杨合李奇洪唐洋喜郑焱天陈兴田汤泉
Owner HEZHOU UNIV
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