Exfoliated polyester/ clay nanocomposite and preparation method thereof
A nano-composite material and exfoliation-type technology, applied in the field of nano-composite materials, can solve the problems of low decomposition temperature of coupling agent, separation of filler and polymer, damage to the performance of the final product, etc., and achieve the goal of improving mechanical properties and gas barrier properties Effect
Active Publication Date: 2015-10-07
东部湾(扬州)生物新材料有限公司
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Problems solved by technology
The main reason is that the decomposition temperature of quaternary ammonium salt and some commonly used coupling agents is low, and the synthesis and solid-state polycondensation of polyester need to react at a high temperature close to 300 °C for a long time, which will inevitably lead to the decomposition of modifiers such as quaternary ammonium salt , thereby reducing the performance and appearance of composite materials
More importantly, conventional modification methods are difficult to improve the interaction between the polymer and the filler, which will lead to the separation of the filler and the polymer during the molding process of polyester, resulting in microcracks, which seriously damage the performance of the final product
Method used
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Effect test
Embodiment 1
[0029] 20 grams of montmorillonite (MMT) was dispersed in 1000 grams of water, 5 grams of DPA was added respectively, the pH value of the mixture was adjusted to 9, and the reaction was stirred for 12 hours. After the reaction was completed, unreacted DPA was removed by centrifugal washing, and dried at 80° C. under vacuum to constant weight to obtain sample A.
Embodiment 2
[0031] 20 g of MMT was dispersed in 1000 g of water, 10 g of DPA was added respectively, the pH value of the mixture was adjusted to 9, and the reaction was stirred for 12 hours. After the reaction was completed, unreacted DPA was removed by centrifugal washing, and dried at 80° C. under vacuum to constant weight to obtain sample B.
Embodiment 3
[0033] 20 grams of mica was dispersed in 1000 grams of water, 20 grams of DPA was added respectively, the pH value of the mixture was adjusted to 9, and the reaction was stirred for 12 hours. After the reaction was completed, unreacted DPA was removed by centrifugal washing, and dried at 80° C. under vacuum to constant weight to obtain sample C.
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Abstract
The invention discloses an exfoliated polyester / clay nanocomposite. The exfoliated polyester / clay nanocomposite is produced through in situ polymerization of exfoliated polyester monomer and clay pretreated through 4- (2-ethylamine) benzene-1 and 2-diphenol ( DPA ). The component of the clay comprises SiO2 and A 12O3. The granularity of the clay is smaller than 200 meshes, and the structure of the clay is stratiform or fibriform aluminosilicate mineral powders. According to the prepared exfoliated polyester / clay nanocomposite, the mechanical property of PET is improved greatly, the gas barrier property of PET is improved greatly, and the transmittances of carbon dioxide and oxygen can be lowered to about 10% that of the purified PET material, so that the PET / MMT nanocomposite can become a packaging material with high barrier property which can be used in the areas such as plastic beer bottle.
Description
technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to an exfoliated polyester / clay nanocomposite material and a preparation method thereof. Background technique [0002] It is known that in recent years, in order to improve the mechanical properties and gas barrier properties of polyester materials, many companies and research groups have successively developed methods for preparing polyester nanocomposites using layered silicates. However, the layer polarity of layered silicate is very high, and the compatibility with the low-polarity polyester main chain is not good, and the silicate layer has a strong interaction with interlayer ions, so it is difficult to make It is dispersed into the polyester matrix in the state of a single layer, so that the modification effect of the silicate cannot be fully exerted. [0003] In order to improve the dispersibility of clay and fully reflect the modification effect of clay, be...
Claims
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IPC IPC(8): C08G63/183C08G63/78C08K9/04C08K3/34C08K3/36C08K3/22
Inventor 殷明
Owner 东部湾(扬州)生物新材料有限公司