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Preparation method for compound-type inorganic flame retardation powder material with dual core-shell structure

A core-shell structure, inorganic flame-retardant technology, applied in the direction of inorganic pigment treatment, chemical instruments and methods, fibrous fillers, etc., can solve the problems of poor adding effect, uneven surface coating, insufficient binding force, etc. Inexpensive, avoiding the difficulty of filtering fine particles, and improving the effect of dispersibility

Active Publication Date: 2014-05-28
连云港倍特超微粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the method for surface modification of magnesium hydroxide is mainly surface chemical modification, and the commonly used surface modifier is mainly organosilane coupling agent, but directly coating organosilane coupling agent on the surface of magnesium hydroxide is also There are problems of insufficient binding force and uneven surface coating, so that the modified magnesium hydroxide flame retardant still has the problem of poor adding effect

Method used

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  • Preparation method for compound-type inorganic flame retardation powder material with dual core-shell structure
  • Preparation method for compound-type inorganic flame retardation powder material with dual core-shell structure
  • Preparation method for compound-type inorganic flame retardation powder material with dual core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: figure 1 As shown, the composite inorganic flame retardant powder material with double core-shell structure is prepared by the following process steps.

[0027] (1) Prepare a calcium carbonate suspension with a concentration of 20g / l in a synthetic reactor with stirring; prepare a lime milk suspension with a concentration of 75g / l, and pour it into a lime milk high-level metering tank; prepare a brine solution to make it The concentration of magnesium chloride reaches 80g / l, and then it is poured into the high level metering tank of magnesium chloride. The molar ratio between the calcium carbonate put into the reactor earlier and the theoretical magnesium hydroxide generated by subsequent reaction is 0.08:1.0.

[0028] (2) Heat the calcium carbonate suspension in the reactor to 70°C, and slowly add brine solution and milk of lime suspension into the reactor from two high-level metering tanks under stirring to control the flow of the two materials. The flow r...

Embodiment 2

[0035] Example 2: This composite inorganic flame retardant powder material is prepared by the following process steps.

[0036] (1) Prepare a calcium carbonate suspension with a concentration of 50g / l in a synthetic reactor with stirring; prepare a milk of lime suspension with a concentration of 60g / l, and pour it into a high-level metering tank for milk of lime; prepare a brine solution to make it The concentration of magnesium chloride reaches 100g / l, and then it is poured into the high-level metering tank of magnesium chloride. The molar ratio between the calcium carbonate placed in the reactor earlier and the theoretically generated magnesium hydroxide in the subsequent reaction is 0.05:1.0.

[0037] (2) Heat the calcium carbonate suspension in the reactor to 80°C, and slowly add brine solution and lime milk suspension into the reactor from two high-level metering tanks under stirring to control the flow of the two materials. The flow rate is added to ensure that the magne...

Embodiment 3

[0041] Example 3: This composite inorganic flame retardant powder material is prepared by the following process steps.

[0042] (1) Prepare a calcium carbonate suspension with a concentration of 30g / l in a synthetic reactor with stirring; prepare a milk of lime suspension with a concentration of 90g / l, and put it into a high-level metering tank for milk of lime; prepare a brine solution to make it The concentration of magnesium chloride reaches 150g / l, and then it is poured into the high-level metering tank of magnesium chloride. The molar ratio between the calcium carbonate placed in the reactor earlier and the theoretical magnesium hydroxide generated by the subsequent reaction is 0.04:1.0.

[0043] (2) Heat the calcium carbonate suspension in the reactor to 90°C, and slowly add the brine solution and lime milk suspension into the reactor from two high-level metering tanks under stirring to control the flow of the two materials. The flow rate is added to ensure that the magn...

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Abstract

The invention discloses a preparation method for a compound-type inorganic flame retardation powder material with a dual core-shell structure, which comprises the following steps: 1) simultaneously and continuously adding a lime milk fluid suspension with 30g / l-150g / l of calcium hydrate content and a brine solution with 50g / l-200g / l of magnesium chloride concentration in a calcium carbonate suspending liquid with 10g / l-50g / l of content, wherein the mol ratio of added magnesium chloride to calcium hydrate is 1.0-1.2: 1.0, and the mol ratio of calcium carbonate to magnesium hydroxide generated by a subsequent reaction is 0.01-0.10: 1.0; 2) reacting magnesium chloride and calcium hydrate in the above mixed liquor, and then insulating and aging to generate a reaction fluid suspension; 3) adding an alkali-silica metal salt solution in the reaction fluid suspension, introducing CO2-containing gas for a carbonization reaction to generate a carbonization fluid suspension; and 4)filtering and drying the carbonization fluid suspension to obtain the inorganic flame retardation powder material. The method has the characteristics of simple process, easy acquisition of raw material and low cost; and the product has the advantages of large granularity, good dispersibility, easy organic modification and good flame retardation effect.

Description

technical field [0001] The invention relates to a preparation method of a flame-retardant powder material, in particular to a preparation method of a double core-shell structure composite inorganic flame-retardant powder material. Background technique [0002] Magnesium hydroxide is an additive inorganic flame retardant, which has non-toxic and smoke-eliminating effects, and can overcome the shortcomings of organic halogen-containing flame retardants in releasing halogen-containing toxic gases; it is comparable to the currently commonly used inorganic flame retardant aluminum hydroxide Compared with magnesium hydroxide, the decomposition product of magnesium hydroxide is stronger in alkalinity, which can quickly neutralize the acidic and corrosive gases generated during the combustion of plastics; the decomposition temperature of magnesium hydroxide is 100°C higher, adding magnesium hydroxide is flame retardant Plastics with additives can withstand higher processing temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/06C08K9/10C08K3/22C08K3/26C08K3/36
Inventor 孟令光
Owner 连云港倍特超微粉有限公司
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