Nanocomposite foaming agent and its preparation method and foamed product

A composite foaming agent and nano-composite technology, applied in the field of preparation of nano-composite foaming agents, can solve the problems of foaming efficiency and quality reduction, difficulty in controlling cell size, difficulty in uniform dispersion, etc. Small, to avoid the effect of local overheating

Active Publication Date: 2017-02-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As for the chemical foaming agent, because it is easy to reunite itself, if it is directly mixed with plastic raw materials for foaming, it is not easy to disperse evenly, resulting in local overheating, it is difficult to control the size of the cells, and there are few nucleation points, and the foaming efficiency and quality are greatly reduced. Therefore, its application in microcellular foam is limited

Method used

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  • Nanocomposite foaming agent and its preparation method and foamed product
  • Nanocomposite foaming agent and its preparation method and foamed product
  • Nanocomposite foaming agent and its preparation method and foamed product

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preparation example Construction

[0035] The invention provides a nano-composite foaming agent and a method for preparing the nano-composite foaming agent. The preparation method is characterized in that the calcium-based montmorillonite is acidified and modified first, and then the montmorillonite is decomposed by ultrasonic action. peel off. Dissolve the organic foaming agent in a certain amount of solvent, add it to the stripped montmorillonite system, stir and react at a certain temperature, and through a suitable washing process, the OBSH in the layer can be evenly dispersed in the montmorillonite after being precipitated. Between the soil layers, the OBSH outside the layer is removed at the same time, and dried to constant weight to obtain a nanocomposite foaming agent.

[0036] In the present invention, "nano" in the so-called "nanocomposite foaming agent" describes the composite process, because the monolithic layer thickness of montmorillonite is about 1 μm, and the original soil particle size of mont...

Embodiment 1

[0056] The preparation of embodiment 1 composite blowing agent

[0057] (1) Preparation of hydrogenated montmorillonite

[0058] Weigh 1g of calcium-based montmorillonite (particle size 20-40μm), and disperse it into 100ml of deionized water with electromagnetic stirring at 25°C, then add 10ml of 1mol / L HCl, and react at 85°C for 4h. After the reaction was completed, the precipitate was centrifuged, washed with deionized water until neutral, and dried at 75°C for 12 hours to achieve a constant weight, that is, to obtain hydrogenated montmorillonite, which was denoted as H-MMT.

[0059] (2) Preparation of 4,4-oxobisbenzenesulfonyl hydrazide / montmorillonite composite foaming agent by stripping and recombining

[0060] Weigh 1g of H-MMT and disperse it into 25mL of deionized water at room temperature. After electromagnetic stirring for 2h, ultrasonic stripping at 25°C for 10min, add 75mL of DMF to the system, and then sonicate for 60min. Then, 20 mL of DMF solution dissolved wi...

Embodiment 2

[0061] The preparation of embodiment 2 composite foaming agent

[0062] (1) Preparation of hydrogenated montmorillonite

[0063] Weigh 1g of calcium-based montmorillonite (particle size 40-70μm), and disperse it into 100ml of deionized water under electromagnetic stirring at 25°C, then add 10ml of 1mol / L HCl, and react at 75°C for 4h. After the reaction was completed, the precipitate was centrifuged, washed with deionized water until neutral, and dried at 80°C for 12 hours to reach a constant weight, that is, to obtain hydrogenated montmorillonite, which was denoted as H-MMT.

[0064] (2) Preparation of 4,4-oxobisbenzenesulfonyl hydrazide / montmorillonite composite foaming agent by stripping and recombining

[0065] Weigh 1g of H-MMT and disperse it into 40mL of deionized water at room temperature. After electromagnetic stirring for 2h, ultrasonic stripping at 25°C for 30min, add 75mL of DMF to the system, and then sonicate for 15min. Then, 8 mL of DMF solution in which 3 g o...

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Abstract

The invention relates to a nano composite foaming agent and a preparation method and a foamed product thereof. The foaming agent is compounded from layered montmorillonite and 4,4-oxo-bis hydrazide, wherein the mass ratio of the 4,4-oxo-bis hydrazide to the montmorillonite is 1:(4-16). The composite foaming agent is obtained by a method of recombining and compounding the layered montmorillonite with the 4,4-oxo-bis hydrazide after stripping in preparation of the foaming agent. The foaming agent has the advantages that an organic foaming agent is embedded between nanoscale montmorillonite layers, so that the foaming agent is refined, the dosage of the foaming agent is effectively controlled, a nucleating point is increased, the foaming efficiency is improved, formed bubbles are even and small in holes, and meanwhile, the property of the obtained foamed product is also improved to a certain extent by adding of an inorganic material.

Description

technical field [0001] The invention relates to the field of preparation of a nanocomposite foaming agent, in particular to an embedded nanocomposite foaming agent prepared by stripping and recombining method and its preparation method and the prepared composite foaming agent in plastic foaming Applications. Background technique [0002] In the 1980s, F.Martini of the Massachusetts Institute of Technology proposed the concept of microcellular foam and successfully developed it. Compared with ordinary foam, microcellular foam has excellent mechanical properties and thermal stability. Currently, two types of blowing agents can be used for plastic foaming, one is physical blowing agent and the other is chemical blowing agent. The research work on microcellular foam plastics mainly uses supercritical carbon dioxide or nitrogen as the foaming agent. The physical foaming agent in the supercritical state has very good solubility in plastic raw materials, and in order to make micro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/10C08K3/34C08L63/00
Inventor 郭灿雄李靖吴淑芬
Owner BEIJING UNIV OF CHEM TECH
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