Preparation method of surface cladding type composite inorganic fire retardant

An inorganic flame retardant and coating technology, applied in the field of chemical engineering, can solve problems such as uneven dispersion and inability to fully exert the synergistic effect of flame retardants, and achieve the effect of promoting development

Inactive Publication Date: 2007-04-18
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the current compounding or compounding of inorganic flame retardants is to mix various flame retardants mechanically and physically before use or before use. Generally, there is a problem of uneven dispersion, and the synergistic effect between flame retardants cannot be fully exerted.

Method used

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  • Preparation method of surface cladding type composite inorganic fire retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 11.6kg ultrafine magnesium hydroxide (brucite) powder into 395L tap water and add 421g industrial grade sodium hexametaphosphate ((NaPO 3 ) 6 content is 95%), stirred at high speed for 20 minutes to form a uniformly dispersed suspension, and added a small amount of lye to control the pH between 10.5 and 11; 391 grams of industrial grade zinc sulfate (ZnSO 4 ·7H 2 O content is 98%) is dissolved in tap water and is made into 0.1mol / L solution, and 111 grams of industrial caustic soda (NaOH content is 96%) is dissolved in tap water and is made into 0.1mol / L solution; Then add magnesium hydroxide suspension Add zinc sulfate solution and alkali solution at the same time at the same flow rate of 1.8L / min. After the reaction was completed at room temperature, press-filtered and washed, the filter cake was dried and air-jet milled, and finally surface-modified with a silane coupling agent at 90°C to obtain product 1. The main technical indicators of this product and the ...

Embodiment 2

[0021] Add 46.8kg superfine aluminum hydroxide powder into 281L tap water and add 421g industrial grade sodium hexametaphosphate ((NaPO 3 ) 6 content of 95%), stirred at high speed for 20 minutes to form a uniformly dispersed suspension, and added a small amount of lye to control the pH between 9 and 9.5; 1.2kg of industrial grade zinc sulfate (ZnSO 4 ·7H 2 O content is 98%) is dissolved in tap water and is made into 0.1mol / L solution, and 333g industrial caustic soda (NaOH content is 96%) is dissolved in tap water and is made into 0.1mol / L solution; Then add aluminum hydroxide suspension simultaneously Add zinc sulfate solution at a flow rate of 4.6L / min, and add alkali solution at a flow rate of 9.13L / min. After the reaction was completed at room temperature, press-filtered and washed, the filter cake was dried, then jet-milled, and finally surface-modified with a silane coupling agent at 90°C to obtain product 2. The main technical indicators of this product and the main...

Embodiment 3

[0023] Add 13.9kg ultrafine magnesium hydroxide (brucite) powder into 394L tap water and add 465g industrial grade sodium hexametaphosphate ((NaPO 3 ) 6 content is 95%), stirred at high speed for 20 minutes to form a uniformly dispersed suspension, and added a small amount of lye to control the pH between 10.5 and 11; 469g of industrial grade zinc sulfate (ZnSO 4 ·7H 2 O content is 98%) tap water and is made into 0.1mol / L solution, and 133g industrial caustic soda (NaOH content is 96%) is dissolved in tap water and is made into 0.1mol / L solution; At the same flow rate of L / min, zinc sulfate solution and alkali solution are added at the same time. After the reaction was completed at room temperature, press-filtered and washed, the filter cake was dried and air-flow pulverized, and finally surface-modified with an aluminate coupling agent at 90°C to obtain product 3. The main technical indicators of this product and the application performance of filled EVA cable materials ar...

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Abstract

This invention relates to a hydration zinc oxide coated magnesium hydroxide or hydration zinc oxide coated aluminium hydroxide compounding fire - retardant agent. Superfine aluminium hydroxide or magnesium hydroxide is scattered in to water with hexa- sodium metaphosphate for making suspension, and then zinc saline solution and alky solution are added into suspension simultaneously for coating reaction, at last, the reaction product of coating reaction is filtered, washed, dried, deploymerized and conducted surface reshaping treatment with couplant. This compounding inorganic fire-retardant agent make the chemical combination of aluminium hydroxide and hydration zinc oxide, magnesium hydroxide and hydration zinc oxide into truth, so the coordinated fire-retardant effect of aluminium hydroxide, magnesium hydroxide and hydration zinc oxide can be played at greatest extend to improve the fire-retardant efficiency of compounding inorganic fire-retardant agent obviously.

Description

technical field [0001] The present invention relates to a method for preparing a surface-coated composite inorganic flame retardant, more precisely, a composite inorganic flame retardant of hydrated zinc oxide-coated magnesium hydroxide type and hydrated zinc oxide-coated aluminum hydroxide type The invention discloses a preparation method of an agent, belonging to the field of chemical engineering. Background technique [0002] At present, the development of flame retardants in the world shows the trend of non-halogenated, compound, harmless or low-harm and low-smoke. Inorganic flame retardants such as aluminum hydroxide and magnesium hydroxide have good chemical stability, are not volatile, have low toxicity or are non-toxic, do not produce corrosive and other harmful gases, are environmentally friendly, and have rich sources of raw materials and low prices. The general trend of the development of flame retardants towards environmental protection has become the main direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K21/02
Inventor 郑水林张清辉邹勇吴良方肖友霞
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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