Nano composite foaming agent and preparation method and foamed product thereof

A composite foaming agent and nano-composite technology, applied to the application of composite foaming agent in plastic foaming, embedded nano-composite foaming agent and the field of preparation thereof, can solve the problem of reduced foaming efficiency and quality, and difficulty in controlling foaming. Pore ​​size, difficult to disperse evenly, etc., to achieve the effect of easy operation, small cell size, and avoiding local overheating

Active Publication Date: 2014-05-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, i

Method used

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  • Nano composite foaming agent and preparation method and foamed product thereof
  • Nano composite foaming agent and preparation method and foamed product thereof
  • Nano composite foaming agent and preparation method and foamed product thereof

Examples

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Example Embodiment

[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 calcium-based montmorillonite is first acidified and modified, and then the montmorillonite is modified by ultrasonic 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 precipitation Between the soil layers, remove the OBSH outside the layers at the same time, and dry to constant weight to obtain the nano composite foaming agent.

[0036] In the present invention, the "nano" in the so-called "nano composite foaming agent" refers to the composite process, because the thickness of the single layer of montmorillonite is about 1μm, while the size of the original montmorillonite is about 20-70...

Example Embodiment

[0056] Example 1 Preparation of composite blowing agent

[0057] (1) Preparation of hydrogenated montmorillonite

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

[0059] (2) Stripping and restructuring to prepare 4,4-oxobisbenzenesulfonyl hydrazide / montmorillonite composite foaming agent

[0060] Weigh 1g of H-MMT and disperse it into 25mL of deionized water at room temperature. After electromagnetic stirring for 2h, ultrasonic peeling is performed at 25°C for 10min, 75mL DMF is added to the system, and then sonicated for 60min. Then add 20 mL of a DMF solution (the pH of the solution ...

Example Embodiment

[0061] Example 2 Preparation of composite blowing agent

[0062] (1) Preparation of hydrogenated montmorillonite

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

[0064] (2) Stripping and restructuring to prepare 4,4-oxobisbenzenesulfonyl hydrazide / montmorillonite composite foaming agent

[0065] Weigh 1g of H-MMT and disperse it into 40mL of deionized water at room temperature. After electromagnetic stirring for 2h, ultrasonic peeling is carried out at 25°C for 30min, 75mL DMF is added to the system, and ultrasonic for 15min. Then add 8 mL of the DMF solution (the pH of the s...

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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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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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