A method for forming a flame retardant

Abstract

This invention discloses a method for forming a flame retardant. First, magnesium aluminum hydrotalcite is synthesized as the main flame retardant additive, and its surface is modified with a silane coupling agent. Then, ABS resin is mixed and added, followed by melt mixing and hot pressing to improve its flame retardant properties and material properties.

Claims

1. A method for forming a flame retardant, comprising at least: a first-stage pretreatment stage, comprising at least: A magnesium-aluminum layered double hydroxide precursor was synthesized; a silane solution was prepared, comprising: preparing a γ-aminopropyltriethoxysilane coupling agent hydrolysate; preparing a 3-methacryloxypropyltrimethoxysilane coupling agent hydrolysate; and adding the 3-methacryloxypropyltrimethoxysilane coupling agent hydrolysate to the γ-aminopropyltriethoxysilane coupling agent hydrolysate. The process includes: surface modification of magnesium-aluminum layered double hydroxides; a second stage of compounding and molding, which includes at least: mixing ABS resin with modified magnesium-aluminum hydrotalcite in different formulations, wherein the modified magnesium-aluminum hydrotalcite in different formulations is selected from the group consisting of 1% modified magnesium-aluminum hydrotalcite powder, 3% modified magnesium-aluminum hydrotalcite powder, and 5% modified magnesium-aluminum hydrotalcite powder; and a melt compounding and a hot pressing molding.

2. The method as described in claim 1, wherein the method for synthesizing the magnesium-aluminum layered double hydroxide precursor comprises at least: preparing a metal salt solution; preparing an alkaline precipitant solution; performing a coprecipitation reaction; performing a aging treatment; performing a filtration and a washing; and performing a drying and a grinding.

3. The method as described in claim 2, wherein the method for preparing the metal salt solution comprises at least: weighing magnesium nitrate hexahydrate and aluminum nitrate nonahydrate according to a magnesium:aluminum ratio of approximately 2:1, dissolving them in deionized water to a concentration of approximately 0.4 to 0.6 volume moles and stirring thoroughly to form a first solution.

4. The method as described in claim 2, wherein the method for preparing the alkaline precipitant solution comprises at least: preparing a second solution containing sodium hydroxide and sodium carbonate in deionized water, the concentration of which is approximately equal to 0.4 to 0.6 volume moles, and using hydrogen chloride and sodium hydroxide as auxiliary agents to pre-adjust the pH of the second solution to approximately 9 to 11.

5. The method as described in claim 2, wherein the method for coprecipitation reaction comprises at least: slowly adding the first solution to the second solution dropwise in a constant temperature water bath at about 50°C to 70°C and under strong stirring, maintaining the pH value at 10±0.2 during the process, and continuing to stir the reaction for about 1 hour to 3 hours after the addition, so as to form a uniform precipitate.

6. The method as described in claim 1, wherein the method for surface modification of magnesium-aluminum layered double hydroxide includes at least: adding magnesium-aluminum layered double hydroxide powder to a silane coupling agent solution; aging and settling; filtering and washing; and drying and pulverizing.

7. The method as described in claim 6, wherein the method for aging and settling includes at least: settling a modified suspension for 12 to 24 hours.

8. The method as described in claim 6, wherein the method of adding magnesium-aluminum layered double hydroxide powder to a silane coupling agent solution comprises at least: slowly adding a dry magnesium-aluminum layered double hydroxide powder to a hydrolyzed silane coupling agent solution at room temperature, slowly raising the temperature to 60°C to 70°C, and continuously stirring for 1 hour to 2 hours.

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