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Preparation method of intercalated nanocomposite foaming agent

A nanocomposite and foaming agent technology, applied in the field of intercalation compound preparation, can solve the problems of complex decomposition mechanism, no clear explanation, etc., and achieve the effect of improving agglomeration, improving agglomeration phenomenon and high efficiency

Inactive Publication Date: 2010-12-01
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly due to the following reasons, firstly, organic blowing agents such as AC are easy to decompose under different acid-base conditions; secondly, the water content in the reaction system has a great influence on the intercalation process; thirdly, the intercalation The influence of the process on the decomposition mechanism of organic blowing agents such as AC is relatively complicated, and there is still no clear explanation in the academic field.

Method used

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  • Preparation method of intercalated nanocomposite foaming agent
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  • Preparation method of intercalated nanocomposite foaming agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Disperse Na-montmorillonite in a certain amount of deionized water and stir for 1 hour. Azodicarbonamide was dissolved in a certain amount of dimethyl sulfoxide and added to the previous montmorillonite slurry. At a certain temperature, stir vigorously for 24 hours and then centrifuge, and then use appropriate amount of DMSO and CCl 4 Thoroughly wash the product multiple times to completely remove AC from the MMT surface. Vacuum-dried at 60°C for 24 hours to obtain the intercalation composite blowing agent AC-MMT.

[0019] Table 1 Preparation process parameters of azodicarbonamide / montmorillonite intercalation composite foaming agent

[0020]

Embodiment 2

[0022] (1) Preparation of organic montmorillonite

[0023] Weigh 10g of sodium montmorillonite and suspend it in 300mL of deionized water, stir in a water bath and heat to 80°C; disperse 3g of cetyltrimethylammonium bromide (CTAB) in 20mL of deionized water and drop Add it to the above MMT suspension. Heat to 90°C in a water bath, stir at constant temperature for 4 hours, filter and wash with water for several times until there is no bromide ion, dry at 90°C, and grind to 300 mesh to obtain O-MMT.

[0024] (2) Preparation of 4,4 oxobisbenzenesulfonyl hydrazide-organized montmorillonite intercalation composite foaming agent

[0025] Organic montmorillonite O-MMT (1g) was dispersed in 30mL H 2 O; 1g of 4,4 oxobisbenzenesulfonyl hydrazide (OBSH) was dissolved in 20mL of DMSO, and the two were mixed. Stir for 24 hours, centrifuge, and dry at 60°C for 24 hours to obtain the intercalation composite foaming agent OBSH-OMMT.

[0026] Table 2 Parameters of preparation process of 4,4...

Embodiment 3

[0029] Foaming experiments were carried out with different formulations in Example 1. Raw materials: Stir intercalation composite foaming agent and silane coupling agent in ethylene glycol solution for 3 hours, dry, and then mix the obtained product with ethylene vinyl acetate copolymer resin (EVA) and stearic acid. 100 parts of EVA, 1.5 parts of composite blowing agent, and 1 part of stearic acid are used to form a mixture of the above raw materials. Stir in a high-speed mixer for 3 minutes, then knead in a screw extruder with a screw diameter of Φ32 and a screw extrusion speed of 50r / min. ℃, 180°C, 195°C, select the Φ4 monofilament die to extrude and foam to obtain a composite foam material. The intercalated composite foaming agent used therein is calculated according to the formula in Example 1.

[0030] The foaming effect of different proportions of foaming agents is different. Through the observation of the foamed materials, it is mainly to compare the uniformity of the...

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Abstract

The invention relates the field of chemical foaming agents for foaming micro-bubble plastic and mainly discloses a method for preparing an intercalated nanocomposite foaming agent and a use of using a prepared intercalated composite as the plastic foaming agent. The invention provides the preparation method of the intercalated nanocomposite with simple operation, low production cost and high production efficiency for overcoming the shortcomings in the prior art. Compared with the prior art, the method has the advantage that the method can prepare the intercalated nanocomposite foaming agent by exploring and improving experimental conditions and adopting the appropriate washing process. The intercalated nanocomposite foaming agent is different from the simple adsorption composite foaming agent, has the advantages of an organic-inorganic nanocomposite material and can be well mixed with a plastic raw material, effectively control the dosage of the foaming agent, avoid the local overheating during the foaming process, have high foaming efficiency, lead formed foams to be uniform and lead the hole diameter to be small.

Description

Technical field: [0001] The present invention relates to the field of methods for preparing intercalation complexes. It mainly relates to the preparation of an intercalated nanocomposite foaming agent by a solution intercalation method and the use of the prepared intercalated nanocomposite foaming agent as a plastic foaming agent. Background technique: [0002] One of the industrial uses of blowing agents is for the foaming of PVC, rubber, polyolefins such as polyethylene or polypropylene, or other polymers. Azodicarbonamide (AC) and 4,4 oxobisbenzenesulfonyl hydrazide (OBSH) are two of the most widely used blowing agents. At present, due to the remarkable superiority of microfoam plastics, the research difficulties of foam plastics focus on how to effectively control the foaming dosage, increase the nucleation point, and how to simply and economically prepare microfoam plastics with small pore size, high density and uniform cells. . Most of the current foaming agents are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/10
Inventor 郭灿雄王丽孙培琴
Owner BEIJING UNIV OF CHEM TECH
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