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Preparation method of special nanometer calcium carbonate for antifogging polyethylene films

A nano-calcium carbonate, anti-fog film technology, applied in chemical instruments and methods, fibrous fillers, dyed low molecular organic compound treatment and other directions, to achieve the effects of low production cost, easy infiltration and spreading, and good dispersibility

Inactive Publication Date: 2019-07-05
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a preparation method of nano-calcium carbonate special for polyethylene anti-fog film. The nano-calcium carbonate product obtained by this method can not only meet the dispersibility, transparency, and compatibility of fillers in polyethylene systems. And basic requirements such as mechanical properties, and can effectively prevent the problem of film fogging

Method used

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  • Preparation method of special nanometer calcium carbonate for antifogging polyethylene films
  • Preparation method of special nanometer calcium carbonate for antifogging polyethylene films
  • Preparation method of special nanometer calcium carbonate for antifogging polyethylene films

Examples

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Embodiment 1

[0027] A kind of preparation of nano-calcium carbonate special for polyethylene anti-fog film, comprising the following steps:

[0028] (1) Dilute the milk of lime that has been refined and aged for 24 hours, adjust the specific gravity to 1.050, and then transport it to the membrane reaction carbonizer with an initial temperature of 22°C;

[0029] (2) Pass the purified and cooled kiln gas into the membrane reactor for carbonation reaction, the kiln gas flow rate is 25m 3 / h, the volume content of carbon dioxide is 32%, and when the pH of the reaction solution drops to 7.0, the reaction is terminated, and the nano calcium carbonate slurry is obtained, and its specific surface area is 17.8m 2 / g;

[0030] (3) After step (2) is completed, add 1.2% sodium carboxymethylcellulose into the membrane reactor, stir evenly, and transport to the homogenization tank for insulation aging for 16 hours;

[0031] (4) The calcium carbonate slurry after step (3) aging is transported to the su...

Embodiment 2

[0035] A kind of preparation of nano-calcium carbonate special for polyethylene anti-fog film, comprising the following steps:

[0036] (1) Dilute the milk of lime that has been refined and aged for 24 hours, adjust the specific gravity to 1.040, and then transport it to the membrane reaction carbonizer with an initial temperature of 23°C;

[0037] (2) Pass the purified and cooled kiln gas into the membrane reactor for carbonation reaction, the kiln gas flow rate is 25m 3 / h, the volume content of carbon dioxide is 33%, and when the pH of the reaction solution drops to 7.0, the reaction is terminated, and the nano calcium carbonate slurry is obtained, and its specific surface area is 19.4m 2 / g;

[0038] (3) After step (2) is completed, add 1.6% sodium carboxymethyl cellulose into the membrane reactor, stir evenly and transport to the homogenization tank for insulation aging for 16 hours;

[0039] (4) Transport the aged calcium carbonate slurry in step (3) to a surface treat...

Embodiment 3

[0042] (1) Dilute the milk of lime that has been refined and aged for 24 hours, adjust the specific gravity to 1.055, and then transport it to the membrane reaction carbonizer with an initial temperature of 20°C;

[0043] (2) Pass the purified and cooled kiln gas into the membrane reactor for carbonation reaction, the kiln gas flow rate is 30m 3 / h, the volume content of carbon dioxide is 30%, and when the pH of the reaction solution drops to 7.0, the reaction is terminated, and the nano calcium carbonate slurry is obtained, and its specific surface area is 15.7m 2 / g;

[0044] (3) After step (2) is completed, add 0.8% sodium carboxymethyl cellulose into the membrane reactor, stir evenly and transport to the homogenization tank for heat preservation and aging for 16 hours;

[0045] (4) The calcium carbonate slurry after step (3) aging is transported to the surface treatment tank, is heated to 70 ℃, adds 3.0% glyceryl laurate, glyceryl myristate and polyphenyltrimethoxysiloxane...

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Abstract

The invention discloses a preparation method of special nanometer calcium carbonate for antifogging polyethylene films. The method concretely comprises the following steps: diluting lime milk, and conveying the diluted lime milk into a film reaction carbonizer; introducing a purified and cooled kiln gas into the above film reactor, and carrying out a carbonizing reaction to obtain a nanometer calcium carbonate slurry; adding sodium carboxymethylcellulose into the film reactor the after the completion of the reaction, performing uniform stirring, conveying the obtained slurry into a homogenization tank, and carrying out heat insulation aging; conveying the aged calcium carbonate slurry into a surface treatment tank, heating the aged slurry, adding a composite emulsion of a saturated fatty acid ester and polyphenyltrimethoxysiloxane to carry out secondary cladding modification, and performing stirring to obtain a modified nanometer calcium carbonate slurry; and carrying out pressure filtration dehydration, and drying, crushing, classifying and packaging the hydrated modified slurry to obtain the special nanometer calcium carbonate for antifogging polyethylene films. The nanometer calcium carbonate obtained in the invention can meet the requirements for the dispersibility, transparency and compatibility of a filler in the polyethylene system, and also can effectively prevent the films from fogging.

Description

technical field [0001] The invention relates to the field of preparation of nano calcium carbonate, in particular to a preparation method of special nano calcium carbonate for polyethylene anti-fog film. Background technique [0002] Polyethylene (PE) blown film is one of the largest and most widely used plastic film products in the world. However, due to the non-polarity of the polyethylene film, when there is a certain temperature difference between the inside and outside, the water vapor will continue to condense on the inner surface of the film, forming a lot of fine water droplets, forming an opaque misty water film and causing The light transmission performance is reduced. Whether it is in the application of food preservation packaging or farm shed insulation, it is subject to certain restrictions. [0003] In recent years, anti-fog additives specially developed at home and abroad have achieved certain improvement effects, but at the same time, the addition of such a...

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/10C09C3/08C09C3/12C08K9/10C08K9/04C08K3/26C08L23/06C08J5/18
CPCC01P2004/03C01P2006/12C01P2006/90C08J5/18C08J2323/06C08K3/26C08K9/08C08K9/10C08K2003/265C09C1/021C09C3/006C09C3/08C09C3/10C09C3/12
Inventor 匡尹杰涂敏周琼花刘涛
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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