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Method for preparing special nano calcium carbonate for plastic master batch

A nano-calcium carbonate, plastic masterbatch technology, applied in the direction of calcium carbonate/strontium/barium, fibrous fillers, dyed low molecular organic compounds, etc. The problem of low pH value, improved processability and compatibility, and good compatibility

Active Publication Date: 2014-07-02
SHANXI XINTAI HENGXIN NANO MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned in the patent No. CN101260249B, a new coupling agent is used for wet modification to obtain nano-CaCO for polyhydrocarbon masterbatch. 3 , although it is modified by wet method and new coupling agent, this patent does not clearly propose performance indicators such as the crystal form of nano-calcium carbonate, and several patents mentioned therein also have defects in varying degrees; The composite modification of heavy calcium, light calcium and nano-calcium produces functional nano-calcium, and the mixture of heavy calcium and light calcium is modified by wet method, and the nano-calcium is still modified by dry method; while the patent number CN101987926B adopts the wet method of controlled carbonization process Nano-scale active CaCO for rubber and plastic 3 , the shortcomings are coated with conventional surfactants, the compatibility with rubber and plastic organic matter and the high temperature yellowing effect are not good

Method used

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  • Method for preparing special nano calcium carbonate for plastic master batch
  • Method for preparing special nano calcium carbonate for plastic master batch

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of preparation method of nano-calcium carbonate special for plastic masterbatch, comprises the steps:

[0034] 1) Calcination: take natural limestone and perform high-temperature calcination in a shaft kiln to obtain calcium oxide;

[0035] 2) Digestion: take the calcined product calcium oxide obtained in step 1), digest it with hot water after removing impurities, remove slag and refine it, add water and dilute it into Ca(OH) with a concentration of 13% 2 suspension;

[0036] 3) Carbonization synthesis: take the Ca(OH) prepared in step 2) 2 Suspension, add chelating agent and crystal form control agent, stir for 10 minutes and then pump into the supergravity reactor, and at the same time, feed CO with a volume concentration of 30% 2 Gas, carry out carbonization synthesis reaction at 30 ° C, when the solution in the high gravity reactor is carbonized to pH = 6.53, stop the reaction, and obtain nano calcium carbonate slurry;

[0037] 4) Modification: Take the n...

Embodiment 2

[0045] A kind of preparation method of nano-calcium carbonate special for plastic masterbatch, comprises the steps:

[0046] 1) Calcination: take natural limestone and perform high-temperature calcination in a shaft kiln to obtain calcium oxide;

[0047] 2) Digestion: take the calcined product calcium oxide obtained in step 1), digest it with hot water after removing impurities, remove slag and refine it, add water and dilute it to Ca(OH) with a concentration of 15% 2 suspension;

[0048] 3) Carbonization synthesis: take the Ca(OH) prepared in step 2) 2 Suspension, add chelating agent and crystal form control agent, pump into the high gravity reactor after stirring for 25min, and pass into the high gravity reactor with volume concentration of 33% CO 2 Gas, carry out carbonization synthesis reaction at 27°C, stop the reaction when the solution in the supergravity reactor is carbonized to pH=6.6, and obtain nano-calcium carbonate slurry;

[0049] 4) Modification: Take the nan...

Embodiment 3

[0057] A kind of preparation method of nano-calcium carbonate special for plastic masterbatch, comprises the steps:

[0058] 1) Calcination: take natural limestone and perform high-temperature calcination in a shaft kiln to obtain calcium oxide;

[0059] 2) Digestion: Take the calcined product calcium oxide obtained in step 1), digest it with hot water after removing impurities, remove the slag, refine it, add water and dilute it into Ca(OH) with a concentration of 10% 2 suspension;

[0060] 3) Carbonization synthesis: take the Ca(OH) prepared in step 2) 2 Suspension, add chelating agent and crystal form control agent, stir for 30 minutes and then pump into the supergravity reactor. 2 Gas, carry out carbonization synthesis reaction at 20 ° C, when the solution in the high gravity reactor is carbonized to pH = 6.5, stop the reaction, and obtain nano calcium carbonate slurry;

[0061] 4) Modification: Take the nano-calcium carbonate slurry prepared in step 3), heat it up to 5...

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Abstract

The invention provides a method for preparing special nano calcium carbonate for a plastic master batch. According to the method, on the basis of calcium carbonate and characteristics thereof in application in plastics, internal indicators, such as crystal form, particle size, whiteness, pH value and the like, of nano-CaCO3 are controlled, meanwhile, the agglomeration and second-time surface coating of nano-CaCO3 particles caused by dry-activation modification are avoided by adopting wet activation, the dispersity of nano-CaCO3 is improved by one-time conventional coating, the oil absorption value of nano-CaCO3 is lowered by the one-time conventional coating, the compatibility of nano-CaCO3 with polyolefin plastics is improved by second-time coupling coating, and the processability and compatibility of nano-CaCO3 in the master batch are effectively improved, so that the prepared nano master batch has reinforced, toughened, high-dispersion and high-extrusion characteristics.

Description

technical field [0001] The invention relates to the technical field of plastics, in particular to a preparation method of nano-calcium carbonate for plastic master batches. Background technique [0002] Plastic filled modified masterbatch is the fastest growing new plastic industry in recent years, and has become an important part of the plastic processing industry and one of the main additive materials for plastic products. As the main filler of plastic modified masterbatch, CaCO 3 , its dosage is more than 80%, and CaCO was used in the past 3 Mainly heavy CaCO 3 , light calcium or heavy calcium and light calcium mixed with a small amount of nano-calcium, rarely use pure nano-calcium, the reinforcement and toughness are very low, mainly for filling. With the functionalization of the modified masterbatch, the raw material CaCO 3 The requirements are getting higher and higher, and nano-CaCO 3 As a functional filler, due to its small particle size, large specific surface a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/08C09C3/10C01F11/18C08K9/10C08K9/04C08K3/26
Inventor 吕国章杨芮平李娟娟
Owner SHANXI XINTAI HENGXIN NANO MATERIALS TECH CO LTD
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