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Functional calcium carbonate and method for producing the same

A functional calcium carbonate and functional technology, applied in the treatment of dyed low-molecular organic compounds, dyed high-molecular organic compounds, etc., can solve the problems of single modification effect, strong hygroscopicity of powder, and unsteady material properties Improvement and other issues, to achieve the effect of improving melt fluidity and melt strength, smooth and delicate surface, high filling

Active Publication Date: 2009-06-17
NANJING XIEHE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the surface activation treatment of calcium carbonate mostly uses stearic acid, stearate and various coupling agents (such as titanate, aluminate, borate, phosphate, etc.). The effect of surface lipophilicity and dispersibility is very good, but the modification effect is single, and its organic chain is generally short, and some varieties are also easily hydrolyzed, which cannot form a good and stable interface layer, and the material performance cannot be stably improved, which cannot meet the current requirements. Urgent demand for quality improvement and cost reduction in the plastic product processing industry
In addition, the current general wet and dry treatment processes also have their own advantages and disadvantages. After many studies, we found that the calcium carbonate powder after wet treatment has poor fluidity and strong hygroscopicity. It is non-water soluble, so it cannot be applied to the wet treatment process, and the effect of the dry treatment is unstable, so if the advantages of the wet treatment and the dry treatment can be combined, it will be a very innovative and Applied value technology
However, there is no relevant research and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 80 parts of light calcium carbonate (sedimentation volume 2.8ml / g) and 10 parts of superfine heavy calcium (3000 mesh) were pre-mixed to prepare a 20% aqueous suspension system, and 0.5 parts of the authorized announcement number CN 1276021C patent The polyvinyl chloride functional modifier (as a wet modifier in this example) was stirred at 80°C for 40 minutes, and then the above system was dehydrated and dried to a water content of 0.3%. After the system and nano-calcium carbonate (average particle diameter 50 nanometers) and the functional modifying agent described in the authorized announcement number CN 1304472C patent (as a dry process modifying agent in this example) by weight ratio of 90:10:1 Mixing, at 110°C, low-speed stirring and mixing for 20 minutes, then quickly cool the above materials to below 60°C, and discharge the materials through a 100-mesh sieve to obtain functional calcium carbonate 1.

Embodiment 2

[0031] 90 parts of light calcium carbonate (sedimentation volume 3.2ml / g) and 5 parts of superfine heavy calcium (5000 mesh) were pre-mixed to prepare an aqueous suspension system with a concentration of 20%, and 3 parts of the authorized announcement number CN 1276021C patent were added The polyvinyl chloride functional modifier (as a wet modifier in this example) was stirred at 60°C for 45 minutes, and then the above system was dehydrated and dried to a water content of 0.3%. The dehydrated system Mix with nano-calcium carbonate (average particle diameter 80 nanometers) and the functional modifying agent (in this example as a dry process modifying agent) described in the authorized announcement number CN 1304472C patent in a weight ratio of 95:5:2, in After mixing under high-speed stirring and heating up to 115°C from friction, the above-mentioned materials are rapidly cooled to below 60°C, discharged and sieved to obtain functional calcium carbonate 2.

Embodiment 3

[0033] 85 parts of light calcium carbonate (sedimentation volume 3.0ml / g) and 20 parts of superfine heavy calcium (4000 mesh) were pre-mixed to prepare a 20% aqueous suspension system, and added to the authorized announcement number CN1276021C patent 3 parts of polyvinyl chloride functional modifier (as a wet modifier in this example), stirred at 90°C for 35 minutes, then dehydrated and dried the above system to a water content of 0.5%, the above dehydrated system and Nano-calcium carbonate (average particle size 20 nanometers) and the functional modifying agent described in the Patent No. CN 1304472C (in this case as a dry-process modifying agent) are mixed in a ratio of 90:12:0.5, and stirred at a high speed After lower mixing and self-friction heating up to 120°C, the above materials are rapidly cooled to below 60°C, discharged and sieved to obtain functional calcium carbonate 3.

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Abstract

The invention discloses a functionality calcium carbonate and a preparation method thereof. The functionality calcium carbonate is prepared by compound treatment technology of 'wet method + dry method' of superfine coarse whiting, fine calcium carbonate particle, nanometer calcium carbonate and a modification agent. The functionality calcium carbonate of the invention can promote resin plasticization, reduce melt viscosity, improve melt fluidity and melt intensity, make product surface smooth and fine and have the function of processing an addition agent ACR, and meanwhile is provided with the function of strengthening coupling and excellent surface modification effects. Appropriate increasing of padding of the system does not affect each performance index of the product. The functionality calcium carbonate and the preparation method thereof has the advantages of improving dispersivity and compatibility of each component of prescription system, improving plasticity of bonding strength of interface layer, having excellent interface layer performance, realizing the function of annealing strengthening and strengthening.

Description

technical field [0001] The invention belongs to the field of polyvinyl chloride plastic processing aids, and in particular relates to a functional calcium carbonate and a preparation method thereof. Background technique [0002] Calcium carbonate is an inorganic filler widely used in polymer composites. Adding calcium carbonate to rubber and plastic products can improve the strength, heat resistance, wear resistance, dimensional stability and rigidity of the products to a certain extent, and reduce the cost of the products. However, the hydrophilic and oleophobic surface characteristics of inorganic fillers make it poorly compatible with polymer materials, so irregular aggregates are easily formed during processing, resulting in uneven dispersion inside the polymer material, resulting in internal defects, resulting in product failure. Reduced physical and mechanical properties. In order to overcome the above shortcomings in the application of calcium carbonate powder, impr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/26C09C3/08C09C3/10C08L27/06
Inventor 黄艳黄朝辉韩冰黄海溶刘素侠
Owner NANJING XIEHE CHEM
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