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Method for modifying aluminum hydroxide/magnesium hydroxide flame retardant

A technology of magnesium hydroxide and aluminum hydroxide, which is applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problems of the mechanical properties of modified materials, the migration of unpolymerized small molecules, and the low conversion rate of monomers. Achieve good machining performance, reduce energy consumption and improve mechanical performance

Active Publication Date: 2011-02-16
广东宇星阻燃新材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the free radical monomers adsorbed on the surface of the powder are concerned, due to the high surface energy of the powder surface, the monomer molecules adsorbed on the surface of the powder have the characteristics similar to "fixed" on the surface of the powder. The molecular movement of the molecular movement is limited by the surface energy of the powder, and it is difficult to further polymerize. Under the initiation of the free radical initiator, there is a thin liquid layer between the coated powder and the coating material, which not only affects the monomer conversion rate It is not high and the mechanical properties of the obtained modified materials are also affected, and this coating method can only partially improve the compatibility between the powder and the polymer material, and it is easy to cause the modified material to have an odor and easy to produce unpolymerized small molecules. Migration and other adverse phenomena

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Add a small amount of metallic sodium to 10 g of styrene that has been refined and removed from the polymerization inhibitor, to further remove the moisture therein, and set aside. Dry 1000 grams of aluminum hydroxide with a particle size of 3 microns at 80°C for 2 hours, add it to the high-speed mixer, start the high-speed mixer, spray the dehydrated refined styrene into the high-speed mixer, and continue mixing for 3 minutes. Pack and seal the uniformly mixed material. After the packaged mixture was irradiated with 10KGy in a Co-60 radiation source, it was allowed to stand at room temperature for 2 weeks to obtain an aluminum hydroxide flame retardant coated with polystyrene.

[0017] Product molding: Take 60g of the above-mentioned polystyrene-coated aluminum hydroxide flame retardant, add it to 40g of EVA, add additives, and process it through blending, melt extrusion, pelletizing, injection molding or double-roller kneading and molding Processing and mo...

Embodiment 2

[0020] Example 2: A small amount of sodium metal was added to 8.5 g of (2-ethyl)hexyl acrylate that had been refined and removed from the polymerization inhibitor, so as to further remove the moisture therein, and set aside. Take another 1.5g of maleic anhydride, use the benzene-water azeotrope method to remove a small amount of water therein, distill off the benzene in it to obtain anhydrous maleic anhydride, and dissolve it in the above-mentioned 2-ethylhexyl acrylate , to obtain a mixed monomer. Then 1000 g of brucite (magnesium hydroxide) with a particle size of 3 microns was dried at 80° C. for 2 hours. Add to high speed mixer. Start the high-speed mixer, spray the above-mentioned mixed monomers into the high-speed mixer, and continue mixing for 3 minutes. Pack and seal the uniformly mixed material. After the packaged mixture is irradiated with 25KGy in a Co-60 radiation source, it is sealed and left at room temperature for 2 weeks to obtain magnesium hydroxide powder ...

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Abstract

The invention relates to a method for modifying aluminum hydroxide / magnesium hydroxide flame retardant. A free-radical polymerization monomer is adsorbed on the powder surface to form apparently dry powder; the dry powder is irradiated in a radiation field so as to induce the free-radical polymerization of the monomer; then the mixture is left to stand in room temperature to finish the free-radical polymerization; and a uniform dense polymer enwrapping film is formed on the powder surface, and the polymer film-enwrapped modified modifying aluminum hydroxide / magnesium hydroxide flame retardant is obtained. The method has the advantages of low energy consumption, no pollution, high yield, simple processing and the like; and the product has the advantages of high flame retardance, tensile strength, breaking elongation strength, mechanical processing performance and the like.

Description

technical field [0001] The invention relates to a preparation method of a flame retardant, in particular to a preparation method of a surface-modified magnesium hydroxide / aluminum hydroxide flame retardant. Background technique [0002] Aluminum hydroxide / magnesium hydroxide are two commonly used halogen-free flame retardants at present. They have the advantages of low price and high smoke suppression. They are widely used in many occasions, such as wires and cables, coatings, etc. However, due to its relatively high surface energy and poor compatibility with the polymer matrix, it is commonly used for surface treatment with coupling agents to improve the compatibility between magnesium hydroxide / aluminum hydroxide and polymer materials. The price of the coupling agent is high; the bulk density of the powder after surface treatment is low, and the dust is heavy; the processing temperature is high, and it is usually necessary to use flammable and explosive organic solvents, w...

Claims

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Application Information

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IPC IPC(8): C08L23/08C09C3/10C08K9/10C09C1/40C08L31/04C08K3/22C09C1/02
Inventor 马访中
Owner 广东宇星阻燃新材股份有限公司
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