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A kind of preparation method of nano-calcium carbonate for hard PVC filling

A nano-calcium carbonate, hard technology, applied in the direction of fibrous fillers, dyed polymer organic compounds, etc., can solve the problem of poor compatibility between nano-calcium carbonate and PVC, difficult to prepare rigid PVC products, and inability to fill PVC products in large quantities. and other problems to achieve the effect of avoiding adverse effects, good economic and social benefits, and regular appearance

Active Publication Date: 2018-02-16
ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nano-calcium carbonate prepared by this method, on the one hand, has low compatibility due to the polarity difference between the fatty acid or its salt and PVC; on the other hand, this product cannot be filled with PVC products in large quantities, otherwise it may cause "zinc burning" phenomenon
[0007] In summary, the nano-calcium carbonate produced by the prior art has poor compatibility with PVC, and it is difficult to prepare rigid PVC products with excellent properties.

Method used

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  • A kind of preparation method of nano-calcium carbonate for hard PVC filling

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Effect test

Embodiment 1

[0027] A kind of preparation method of active nano-calcium carbonate for hard PVC, comprises the following processing steps:

[0028] (1) Dilute the milk of lime that has been refined and aged for 15 hours, adjust the specific gravity of the milk of lime to 1.070, and transport it to the carbonation reaction tower, with the initial temperature controlled at 22°C;

[0029] (2) Then pass into the purified and cooled kiln gas for carbonation reaction, the kiln gas flow rate is 2m 3 / h, the volume content of carbon dioxide is 33%, when the pH value of the reaction system drops to 10.0, add the maleic acid-acrylic acid copolymer with acrylic acid content of 40%, the addition of maleic acid-acrylic acid copolymer is calcium carbonate dry basis 3.3% of the mass, continue to react until the pH value of the reaction system drops to 7.0, the carbonation reaction ends, close the kiln gas, continue to stir for 20min, and obtain a nano-calcium carbonate slurry with a specific surface area ...

Embodiment 2

[0032] A kind of preparation method of active nano-calcium carbonate for hard PVC, comprises the following processing steps:

[0033] (1) Dilute the milk of lime that has been refined and aged for 18 hours, adjust the specific gravity of the milk of lime to 1.065, and transport it to the carbonation reaction tower, with the initial temperature controlled at 25°C;

[0034] (2) Then pass into the purified and cooled kiln gas for carbonation reaction, the kiln gas flow rate is 3m 3 / h, the carbon dioxide volume content is 33%, when the reaction system pH value drops to 10.0, add the maleic acid-acrylic acid copolymer that acrylic acid content is 45%, the add-on of maleic acid-acrylic acid copolymer is calcium carbonate dry basis 2.5% of the mass, continue to react until the pH value of the reaction system drops to 7.5, the carbonation reaction ends, close the kiln gas, continue to stir for 30min, and obtain a nano-calcium carbonate slurry with a specific surface area of ​​15.8㎡ / g...

Embodiment 3

[0037] A kind of preparation method of active nano-calcium carbonate for hard PVC, comprises the following processing steps:

[0038] (1) Dilute the milk of lime refined and aged for 15 hours, adjust the specific gravity of the milk of lime to 1.060, transport it to the carbonation reaction tower, and control the initial temperature to 23°C;

[0039] (2) Then pass into the purified and cooled kiln gas for carbonation reaction, the kiln gas flow rate is 4m 3 / h, the carbon dioxide volume content is 30%, when the pH value of the reaction system drops to 10.0, add the maleic acid-acrylic acid copolymer with acrylic acid content of 50%, the addition of maleic acid-acrylic acid copolymer is calcium carbonate dry basis 4.0% of the mass, continue to react until the pH value of the reaction system drops to 7.0, the carbonation reaction ends, close the kiln gas, continue to stir for 20min, and obtain a nano-calcium carbonate slurry with a specific surface area of ​​19.7㎡ / g;

[0040] (...

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Abstract

The invention discloses a method for preparing active nano calcium carbonate for filling hard PVC (polyvinyl chloride). The method includes diluting refined and aged lime milk, regulating the relative density of the lime milk until the relative density of the lime milk reaches 1.060-1.075 and delivering the lime milk into a carbonization reaction tower at the initial temperature of 22-25 DEG C under the control; filling the carbonization reaction tower with purified and cooled kiln gas, carrying out carbonization reaction, adding maleic acid-acrylic copolymers into the carbonization reaction tower when a pH (potential of hydrogen) value of a reaction system is reduced and reaches 10.0, continuing to carry out reaction until the pH value of the system is reduced and reaches 6.5-7.5, terminating carbonization reaction, shutting off the kiln gas and continuing to stir reaction products for 10-30 min to obtain nano calcium carbonate slurry; carrying out pressure filtration dehydration treatment on the nano calcium carbonate slurry and then respectively drying, smashing, classifying and packaging the nano calcium carbonate slurry according to conventional processes to obtain the nano calcium carbonate. The method has the advantages that the specific surface areas of nano calcium carbonate products prepared by the aid of the method range from 15 m<2> / g to 20 m<2> / g, the nano calcium carbonate products are regular in morphology, good in dispersibility and excellent in resin compatibility, mechanical properties of hard PVC plastics can be obviously improved after the hard PVC plastics are filled with the nano calcium carbonate products, and adverse impact on the luster and the aging resistance of the plastics due to iron ions can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and relates to a preparation method of nano calcium carbonate for filling rigid PVC. Background technique [0002] As a new type of functional inorganic material, nano-calcium carbonate is widely used in industries such as rubber, plastics, coatings, sealants, inks and papermaking. Due to the large specific surface area of ​​nano-calcium carbonate, it has high surface activity and shows strong surface binding energy. The application of high-quality nano-calcium carbonate to polymer materials not only plays the role of incremental filling, but also endows some polymer composite materials with better processing properties, improves the mechanical properties of composite materials, beautifies the appearance of products, and acts as a functional modification. [0003] However, due to the small particle size and large surface energy of nano-calcium carbonate, hard agglomeration ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/10
CPCC09C1/021C09C3/10
Inventor 熊文朱勇颜干才林进超
Owner ANHUI PROVINCE XUNCHENG CITY HUANA NEW MATERIAL TECH CO LTD
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