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Aluminum silicate coated hydrotalcite fire retardant and application

A technology of hydrotalcite and aluminum silicate is applied in the field of preparation of flame retardant composite powder, which can solve the problems of poor dispersibility and compatibility, insignificant effect of flame retardant and smoke suppression, large addition amount, etc., so as to improve the mechanical properties. Effect

Active Publication Date: 2018-05-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of hydrotalcite itself, such as easy water absorption and agglomeration, its dispersion and compatibility in polymers are poor, and the effect of flame retardancy and smoke suppression is not obvious when added in a large amount

Method used

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  • Aluminum silicate coated hydrotalcite fire retardant and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] This embodiment includes (1) preparation of hydrotalcite suspension: a certain amount of hydrotalcite is placed in a four-necked reaction flask, and deionized water is added to form a suspension of 60 g / L, and the pH value is adjusted to 4 with dilute hydrochloric acid, and it is set aside . (2) Preparation of coating solution: Weigh 1.95g of sodium silicate, 2.30g of aluminum sulfate, and configure [SiO 3 2- ] Concentration is 0.1mol / L, [Al 3+ ] Each 50 mL of aqueous solution with a concentration of 0.067 mol / L was set aside. (3) Coating treatment: Stir the above-mentioned four-necked flask and heat it to 65°C, then drop the above two coating solutions into the four-necked flask at the same time through a constant pressure dropping funnel at a rate of 1ml / min, and continue stirring Reaction 2h. (4) Drying and grinding: the reaction product was suction-filtered, repeatedly washed with deionized water, dried, ground, sieved with 200 mesh, and set aside.

Embodiment 2

[0012] This embodiment includes (1) preparation of hydrotalcite suspension: put a certain amount of hydrotalcite in a four-necked reaction bottle, add deionized water to prepare a 70 g / L suspension, adjust the pH value to 5, and set aside. (2) Preparation of coating solution: Weigh 3.9g of sodium silicate, 4.6g of aluminum sulfate, and configure [SiO 3 2- ] Concentration is 0.2mol / L, [Al 3+ ] Concentration of 0.13mol / L aqueous solution 50mL, stand-by. (3) Coating treatment: Stir the above-mentioned four-necked flask and heat it to 70°C, then drop the above-mentioned two coating solutions into the four-necked flask at the same time through a constant pressure dropping funnel at a rate of 1ml / min to control the reaction The temperature was 70°C, and the stirring reaction was continued for 3h. (4) Drying and grinding: the reaction product was suction-filtered, repeatedly washed with deionized water, dried, ground, sieved with 200 mesh, and set aside.

Embodiment 3

[0014] This embodiment includes (1) preparation of hydrotalcite suspension: put a certain amount of hydrotalcite in a four-necked reaction bottle, add deionized water to prepare a suspension of 60 g / L, adjust the pH value to 6, and set aside. (2) Preparation of coating solution: Weigh 2.5g of potassium silicate, 2.3g of aluminum nitrate, and configure [SiO 3 2- ] Concentration is 0.1mol / L, [Al 3+ ] Concentration is 0.067mol / L aqueous solution each 50mL, stand-by. (3) Coating treatment: Stir the above-mentioned four-necked flask and heat it to 85°C, then drop the above-mentioned two coating solutions into the four-necked flask at the same time through a constant pressure dropping funnel at a rate of 2ml / min to control the reaction The temperature was 85°C, and the stirring reaction was continued for 4h. (4) Drying and grinding: the reaction product was suction-filtered, repeatedly washed with deionized water, dried, ground, sieved with 200 mesh, and set aside.

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Abstract

The invention discloses an aluminum silicate coated hydrotalcite fire retardant and application. A uniform and compact aluminum silicate coating layer is formed on the surface of hydrotalcite by adopting a coprecipitation manner of an aluminum salt water solution and a silicate water solution, so that the aluminum silicate coated hydrotalcite composite powder solves the problem that inorganic matter powder and polymer are low in compatibility and non-uniform in dispersion, and the mechanical property and flame retardation and smoke inhibition performance of the polymer and the corrosion resistance of hydrotalcite can be improved.

Description

technical field [0001] The invention relates to the preparation of a flame retardant composite powder, in particular to an aluminum silicate-coated hydrotalcite flame retardant and its application in polymers. Background technique [0002] With the increasing awareness of global safety and environmental protection, people have higher and higher requirements for fire safety and flame retardancy of products. Halogen-free, low-smoke, low-toxicity and high-efficiency environmentally friendly flame retardants have become the goal pursued by people. As a multifunctional plastic additive widely used in recent years, hydrotalcites (LDHs) have the functions of flame retardancy, smoke suppression and filling, and are often used in the flame retardancy and smoke suppression of soft PVC. Due to the problems of easy water absorption and agglomeration of hydrotalcite itself, its dispersion and compatibility in polymers are poor, and the effect of flame retardancy and smoke suppression is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K3/34C08L27/06
CPCC08K3/34C08K9/10C08L2201/02C08L27/06
Inventor 徐建平黄昱臻方建波刘春林魏昌林
Owner CHANGZHOU UNIV