Double-covered magnesium hydroxide fire retardant and preparation method thereof

A magnesium hydroxide and flame retardant technology, applied in the field of flame retardants, can solve the problems of easy abrasion of magnesium hydroxide microcapsule powder particles, and achieve the effects of good dispersion, integrity and thermal stability.

Active Publication Date: 2015-07-29
SHANDONG HANGTONG IND & TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention uses the microcapsule method to modify the magnesium hydroxide flame retardant, and overcomes the problem that the traditional single-layer microcapsules are easy to wear and tear when preparing magnesium hydroxide microcapsule powder particles

Method used

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  • Double-covered magnesium hydroxide fire retardant and preparation method thereof
  • Double-covered magnesium hydroxide fire retardant and preparation method thereof
  • Double-covered magnesium hydroxide fire retardant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Weigh 120g of melamine and 30g of formaldehyde into a 2L reaction kettle with 1L of distilled water, adjust the pH to 9 with sodium hydroxide solution as the pH regulator, set the reaction temperature to 75°C, and the stirring speed to 600r / min, reaction 1h to solution is colorless, obtains prepolymer;

[0035] (2) Use acetic acid as the pH regulator to adjust the pH of the prepolymer solution to 5; weigh 385g of magnesium hydroxide powder, add it to the prepolymer solution, and stir for 2 hours, the stirring speed is 600r / min, and the temperature is controlled At 75°C, magnesium hydroxide melamine formaldehyde resin microcapsule suspension was prepared;

[0036] (3) Filter the microcapsule suspension and wash it with ethanol, then dry it in a constant temperature drying oven at 105°C for 10 hours, cool to room temperature, and grind the prepared magnesium hydroxide melamine formaldehyde resin microcapsules into powder;

[0037] (4) Weigh 80g of stearic acid and a...

Embodiment 2

[0042] (1) Weigh 120g of melamine and 30g of formaldehyde into a 2L reaction kettle with 1L of distilled water, adjust the pH to 8.5 with sodium hydroxide solution as the pH regulator, set the reaction temperature to 80°C, and the stirring speed to 400r / min, reaction 1.5h to solution is colorless, obtains prepolymer;

[0043] (2) Use acetic acid as the pH regulator to adjust the pH of the prepolymer solution to 4.5; weigh 230g of magnesium hydroxide powder, add it to the prepolymer solution, and stir for 0.5h at a stirring speed of 700r / min. Controlling 75°C to prepare magnesium hydroxide melamine formaldehyde resin microcapsule suspension;

[0044] (3) Filter the microcapsule suspension and wash it with ethanol, then dry it in a constant temperature drying oven at 105°C for 8 hours, cool to room temperature, and grind the prepared magnesium hydroxide melamine formaldehyde resin microcapsules into powder;

[0045] (4) Weigh 80g of stearic acid and add it into a 2L reaction k...

Embodiment 3

[0050] (1) Weigh 120g of melamine and 30g of formaldehyde into a 2L reaction kettle with 1L of distilled water, adjust the pH to 9.5 with sodium hydroxide solution as the pH regulator, set the reaction temperature to 85°C, and the stirring speed to 400r / min, reaction 1.5h to solution is colorless, obtains prepolymer;

[0051] (2) Use acetic acid as a pH regulator to adjust the pH of the prepolymer solution to 5.5; weigh 500g of magnesium hydroxide powder, add it to the prepolymer solution, and stir for 2.5h at a stirring speed of 700r / min. Control 80 ℃ to prepare magnesium hydroxide melamine formaldehyde resin microcapsule suspension;

[0052] (3) Filter the microcapsule suspension and wash it with ethanol, then dry it in a constant temperature drying oven at 105°C for 16 hours, cool to room temperature, and grind the prepared magnesium hydroxide melamine formaldehyde resin microcapsules into powder;

[0053] (4) Weigh 100g of stearic acid and add it into a 2L reaction kettl...

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Abstract

The invention relates to a double-covered magnesium hydroxide fire retardant and a preparation method thereof, which belong to the technical field of fire retardants. The preparation method is characterized in that melamine and formaldehyde are pre-polymerized first, so as to obtain a prepolymer solution, magnesium hydroxide is put into the prepolymer solution and is then filtered and dried, so as to prepare a prepolymer microcapsule which uses the magnesium hydroxide as a core and the melamine and polyformaldehyde as an inner wall, and then the prepolymer microcapsule is put into a stearic acid ethanol solution and is filtered and dried, so as to prepare a double-wall covered fire retardant microcapsule which uses the prepolymer microcapsule as a core and stearic acid as an outer wall. The obtained double-layer magnesium hydroxide microcapsule has good fire resistance, the initial decomposition temperature of the double-layer covered magnesium hydroxide microcapsule is obviously reduced, the thermostability is good in high-temperature conditions, and the dispersibility is good.

Description

technical field [0001] A double-coated magnesium hydroxide flame retardant and a preparation method thereof belong to the technical field of flame retardants. Background technique [0002] Magnesium hydroxide is a new type of inorganic additive environmentally friendly flame retardant. It has easy-to-obtain raw materials, no harmful substance emissions during its production, use and disposal, good thermal stability, non-volatility, no precipitation, and no toxic gases. The advantages of obvious smoke elimination effect determine that magnesium hydroxide can be used as a high-performance inorganic flame retardant in high molecular polymer materials to enhance the flame retardant performance of high molecular polymer materials. However, the surface of its powder particles has strong polarity, and its dispersion is poor in most hydrocarbon polymers. Once the amount added exceeds 40%, the mechanical properties of polymer materials will be reduced. Therefore, it cannot be direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/10C09C3/08C08K9/10C08K3/22C08L55/02C08G12/32B01J13/02
Inventor 董茂庆江津河代宗国
Owner SHANDONG HANGTONG IND & TRADE CO LTD
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