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Clay film and preparation method thereof

A clay and film technology, applied in the field of clay film and its preparation, can solve the problems of low stability of clay stripping liquid, low degree of clay stripping, and inability to maintain high transparency, etc., achieve excellent self-extinguishing, wide application range, and huge development potential and the effect of applying the foreground

Active Publication Date: 2017-12-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nanocomposite film prepared by this method at 30% polyacrylic acid sodium salt and 70% artificial china clay has been tested: when the thickness is 10µm, the light transmittance at 600nm wavelength reaches about 83%, but the film thickness is relatively thin, and in high clay Components cannot maintain high transparency when the clay content is 70~90%
[0006] Therefore, a clay film and its preparation method have been developed to solve the technical solution for the preparation of polymer / clay composite materials in the prior art. When the composite material has a high clay component of 50-90%, it cannot be highly transparent, and There are defects such as cumbersome production operations, low degree of clay peeling, low stability of clay peeling liquid and high comprehensive cost, which have become problems to be solved urgently by those skilled in the art

Method used

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preparation example Construction

[0037] In a specific embodiment of the present invention, the preparation method of the clay film specifically includes the following steps:

[0038](1) Based on the absolute dry parts, mix 85-95 parts of clay, 5-15 parts of nanocellulose and water to obtain a mixed solution with a concentration of 10-20 mg / mL, and perform ultrasonic treatment after stirring evenly (ultrasonic treatment process : The power of ultrasonic treatment is 400-1000W, the time of ultrasonic treatment is 30-60min, the amount of liquid to be treated is 100-200ml), centrifuged at 4000-6000r / min for 20-40min, and the supernatant is taken to obtain a concentration of 2- 10mg / mL single-layer clay stripping solution;

[0039] (2) According to the number of absolute dry parts, mix 30-90 parts of single-layer clay stripping liquid, 10-70 parts of carboxymethyl cellulose, and 0-10 parts of additives, and stir at 1000-2000r / min 20-30min (when the clay accounts for 70-90% of the total dry fraction of the mixture...

Embodiment 1

[0041] The preparation of montmorillonite film specifically comprises the following steps:

[0042] (1) Based on absolute dry parts, mix 90 parts of montmorillonite, 10 parts of microfibrillated cellulose and water to obtain a mixed solution with a concentration of 10 mg / mL. After stirring evenly, undergo ultrasonic treatment (ultrasonic treatment process: The ultrasonic treatment power is 600W, the ultrasonic treatment time is 30min, and the treatment liquid volume is 100ml), centrifuged at 5000r / min for 30min, and the supernatant is taken to obtain a montmorillonite stripping solution with a concentration of 4.8mg / mL;

[0043] (2) According to the absolute dry parts, mix 90 parts of montmorillonite stripping solution with 10 parts of carboxymethyl cellulose, stir at 1000r / min for 20min, and then perform low-power ultrasonic treatment (ultrasonic treatment power is 40W, The ultrasonic treatment time is 30min, and the treatment liquid volume is 100ml), placed in a flat dish, a...

Embodiment 2

[0046] The preparation of kaolin film specifically comprises the steps:

[0047] (1) Based on absolute dry parts, mix 95 parts of kaolin, 5 parts of microfibrillated cellulose and water to obtain a mixed solution with a concentration of 10 mg / mL. After stirring evenly, undergo ultrasonic treatment (ultrasonic treatment process: ultrasonic treatment The power is 1000W, the ultrasonic treatment time is 60min, and the amount of liquid to be treated is 200ml), centrifuged at 6000r / min for 20min, and the supernatant is taken to obtain a kaolin stripping solution with a concentration of 2.6mg / mL;

[0048] (2) According to the number of absolute dry parts, mix 30 parts of kaolin clay stripping solution, 65 parts of carboxymethyl cellulose and 5 parts of glycerin, stir at 2000r / min for 30min, place it in a flat dish, and heat it at 70℃ , and the humidity is 70%RH, and the kaolin film is obtained by drying.

[0049] The average thickness of the prepared kaolin film is 59 μm, and the l...

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Abstract

The invention discloses a clay film and a preparation method thereof. A single piece layer clay stripping solution is obtained first by exfoliating and dispersing clay with nanometer cellulose, and then the single piece layer clay stripping solution, carboxymethyl cellulose and water are mixed and evenly stirred and dried at a constant temperature and a constant humidity to obtain the clay film. The clay film has the advantages of excellent flame retardancy and high light transmittance. When the total absolute dry fraction of the clay in the film is >= 30%, the clay film has an excellent self-extinguishing function; when the total absolute dry fraction of the clay in the film <= 90%, the thickness is 47-59 [mu]m, and the light transmittance under the wavelength of 600 nm is 80% or above.

Description

technical field [0001] The invention relates to the field of transparent and flame-retardant materials, in particular to a clay film and a preparation method thereof. Background technique [0002] Clay is a kind of natural mineral abundant in my country. It is a silicate with layered structure. It has rich sources, non-toxic, stable chemical properties, high surface area, excellent mechanical properties, high thermal stability and adjustable length and width. Compared with the layered structure and other characteristics, it has received more and more attention in the field of environmentally friendly flame retardant applications. In the past few decades, many researchers have added clay to polymers to improve their flame retardant properties. Although the addition of clay can significantly improve the flame retardant characteristics of polymers, after adding clay, due to the process and The immature conditions cannot make the obtained polymer composite material transparent w...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40
Inventor 方志强明思逸陈港
Owner SOUTH CHINA UNIV OF TECH
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