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Magnesium hydroxide-calcium alginate composite flame retardant and preparation method thereof

A technology of compound flame retardant and calcium alginate, which is applied in fire-resistant coatings and other directions, can solve the problems of unsatisfactory thermal decomposition temperature of products, cumbersome and complicated process, limiting flame retardant effect, etc., and achieves green environmental protection materials and simple process. , the effect of low cost

Active Publication Date: 2020-06-30
武宣宝丰矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the thermal decomposition temperature of this product is as high as 233°C, there are shortcomings in both the product and its preparation method. First, the thermal decomposition temperature of the product is not ideal, which limits its flame-retardant effect at higher temperatures; secondly , the raw materials used in the preparation method are mostly expensive chemical reagents, and the process is cumbersome and complicated

Method used

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  • Magnesium hydroxide-calcium alginate composite flame retardant and preparation method thereof
  • Magnesium hydroxide-calcium alginate composite flame retardant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The concrete steps of preparation are:

[0030] In step 1, the dolomite ore powder is calcined at 900° C. for 3 hours; wherein, the particle size of the dolomite ore powder is 0.1 mm to obtain dolomite lime powder. Then, according to the solid-to-liquid ratio of 1g:5ml, dolomite lime powder was added to water at 20°C and stirred for 60 minutes to obtain digestive juice.

[0031] Step 2: First, according to the volume ratio of 1wt% sodium alginate aqueous solution and digestive juice at a ratio of 1:5, add sodium alginate aqueous solution dropwise to the digestive juice under stirring at 20°C, and stir and foam for 10 minutes to obtain foam bubble gel. The foamed gel is then subjected to drying and setting treatment; wherein, the drying and setting treatment is mold forming drying and setting treatment, and the temperature during the drying and setting treatment is 40° C. made as figure 1 As shown in the curves in , and approximated by figure 2 The magnesium hydroxi...

Embodiment 2

[0033] The concrete steps of preparation are:

[0034] In step 1, the dolomite ore powder is calcined at 925° C. for 2.5 hours; wherein, the particle size of the dolomite ore powder is 1 mm to obtain dolomite lime powder. Then, according to the solid-to-liquid ratio of 1 g: 17 ml, the dolomite lime powder was added into water at 38° C. and stirred for 53 minutes to obtain a digestive juice.

[0035] Step 2: First, according to the volume ratio of 3.3wt% sodium alginate aqueous solution and digestive juice at a ratio of 1:4, add sodium alginate aqueous solution dropwise to the digestive juice under stirring at 38°C, and stir and foam for 23 minutes to obtain Foaming gel. The foamed gel is then subjected to drying and setting treatment; wherein, the drying and setting treatment is mold forming and drying and setting treatment, and the temperature during the drying and setting treatment is 50° C. made as figure 1 As shown in the curves in , and approximated by figure 2 The m...

Embodiment 3

[0037] The concrete steps of preparation are:

[0038] In step 1, the dolomite ore powder is calcined at 950° C. for 2 hours; wherein, the particle size of the dolomite ore powder is 4 mm to obtain dolomite lime powder. Then according to the solid-to-liquid ratio of 1g:28ml, dolomite lime powder was added to water at 56°C and stirred for 45 minutes to obtain digestive juice.

[0039] Step 2: First, according to the volume ratio of 5.5wt% sodium alginate aqueous solution and digestive juice at a ratio of 1:3, add sodium alginate aqueous solution dropwise to the digestive juice under stirring at 56°C, and stir and foam for 35 minutes to obtain Foaming gel. The foamed gel is then subjected to drying and setting treatment; wherein, the drying and setting treatment is mold forming and drying and setting treatment, and the temperature during the drying and setting treatment is 60° C. made as figure 1 As shown in the curves in , and as figure 2 The magnesium hydroxide-calcium al...

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Abstract

The invention discloses a magnesium hydroxide-calcium alginate composite fire retardant and a preparation method thereof. The fire retardant is prepared from magnesium hydroxide and calcium alginate with the molar ratio being (1 to 3) to 1. The method comprises the following steps of calcining dolomite mineral powder to obtain dolomite ash powder, then adding the dolomite ash powder into water forstirring to obtain a digestive juice, then dropwise adding a sodium alginate aqueous solution into the digestive juice under stirring, performing stirring and foaming to obtain a foamed gel, then performing dryness finalization treatment on the foamed gel to prepare a target product, wherein dryness finalization treatment is spray drying finalization, spinning drying finalization, coating dryingfinalization or die formation drying finalization. The magnesium hydroxide-calcium alginate composite fire retardant has a limit oxygen index of 40 percent, is not decomposed with heat still at high temperature of 250 DEG C and is very easy to be widely and commercially applied to the fields of degradable fire-retardant fabrics, fire-retardant coating layers for decoration, non-combustible children toys and the like.

Description

technical field [0001] The invention relates to a composite flame retardant and a preparation method thereof, in particular to a magnesium hydroxide-calcium alginate composite flame retardant and a preparation method thereof. Background technique [0002] Sodium alginate is a linear polysaccharide extracted from natural seaweed. The G unit in its structure can form a special "egg-box" structure with calcium ions, and finally form calcium alginate gel under suitable temperature and pH conditions. . Using calcium alginate gel as precursor, calcium alginate fiber can be prepared by wet spinning process. After testing, the limiting oxygen index of calcium alginate fiber is greater than 30%, which belongs to flame retardant fiber. It can be used as an excellent flame retardant material in the flame, there is white smoke, and it is self-extinguishing when away from the fire. In addition, due to the gel properties of calcium alginate, flame-retardant materials with specific shape...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K21/14C09K21/02
CPCC09K21/02C09K21/14
Inventor 张洪文方伟豹赵倩刘广强蔡伟平
Owner 武宣宝丰矿业有限公司
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