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Preparation method of superfine active hydromagnesite flame-retardant filler

A technology of flame-retardant filler and hydromagnesite powder, which is applied in the direction of plastic/resin/wax insulators, organic insulators, electrical components, etc., can solve the problem of inability to restore product fineness by powder, and achieve easy dispersion of binding force, good resistance Combustibility, compatibility improvement effect

Inactive Publication Date: 2016-12-14
江苏西贝力新材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The powder after wet grinding is easy to agglomerate and form hard agglomerates after being filtered and dried. It must be fully depolymerized by a disperser before the surface modification of the powder can be carried out. However, the disperser currently used in industry usually cannot Reduction to product fineness achieved during wet grinding

Method used

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  • Preparation method of superfine active hydromagnesite flame-retardant filler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Taking 100 kg of hydromagnesite powder as a benchmark. (1) Add 100 kg of hydromagnesite powder and 0.2 kg of sodium hexametaphosphate into water to fully stir and disperse to form a powder slurry with a mass concentration of 35%; (2) Add the powder slurry to a horizontal sand mill for Ultrafine grinding, at the same time add 0.6kg of aminosilane according to the mass ratio of hydromagnesite powder: aminosilane = 1000: 6, and carry out a surface organic modification; (3) Hydromagnesite powder is fully ultrafine grinding, and the particle size distribution is detected reach d 50 =2.15μm, d 97 =4.56μm, and then carry out pressure filtration and dehydration; (4) Put the filter cake obtained from pressure filtration and dehydration into a honeycomb mill for drying and depolymerization, and at the same time add hydromagnesite powder: stearic acid at a mass ratio of 1000: 10 1.0kg of stearic acid was subjected to secondary surface organic modification at a temp...

Embodiment 2

[0023] Embodiment 2: Taking 100 kg of hydromagnesite powder as a benchmark. (1) Add 100 kg of hydromagnesite powder and 0.3 kg of sodium hexametaphosphate into water to fully stir and disperse to form a powder slurry with a mass concentration of 40%; (2) Add the powder slurry to a horizontal sand mill for Ultrafine grinding, at the same time add 0.7kg of aminosilane according to the mass ratio of hydromagnesite powder:aminosilane=1000:7, and carry out a surface organic modification; (3) Hydromagnesite powder is fully ultrafinely ground, and the particle size distribution is detected reach d 50 =1.56μm, d 97 =3.49μm, and then carry out pressure filtration dehydration; (4) Put the filter cake obtained from pressure filtration dehydration into a honeycomb mill for drying and depolymerization, and at the same time add hydromagnesite powder: stearic acid in a mass ratio of 1000: 12 1.2kg of stearic acid was subjected to secondary surface organic modification at a temperature of 1...

Embodiment 3

[0024] Embodiment 3: Taking 100 kg of hydromagnesite powder as a benchmark. (1) Add 100kg of hydromagnesite powder and 0.4kg of sodium hexametaphosphate into water to fully stir and disperse to form a powder slurry with a mass concentration of 45%; (2) Add the powder slurry to a horizontal sand mill for ultra- Finely grind, and at the same time, add 0.8kg of aminosilane according to the mass ratio of hydromagnesite powder:aminosilane=1000:8, and carry out a surface organic modification; (3) The hydromagnesite powder is fully ultra-finely ground, and the particle size distribution of the detection reaches d 50 =2.50μm, d 97 =5.22μm, and then carry out pressure filtration dehydration; (4) Put the filter cake obtained from pressure filtration dehydration into the honeycomb mill for drying and depolymerization, and add hydromagnesite powder:aluminate=1000:8 mass ratio 0.8kg of aluminate was subjected to secondary surface organic modification at a temperature of 150°C to obtain u...

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Abstract

The invention discloses a preparation method of superfine active hydromagnesite flame-retardant filler. The preparation method comprises the steps that hydromagnesite powder and an inorganic dispersant are added into water to prepare powder slurry with the mass concentration of 35%-55%; the powder slurry is fed into a horizontal sand mill for superfine grinding, and meanwhile a silane coupling agent is added for first-time surface modification according to the mass ratio 1,000:(3-10) of the hydromagnesite powder to the silane coupling agent; after grinding size distribution reaches the conditions that d50 is equal to 1 micrometer to 3 micrometers and d97 is equal to 3 micrometers to 10 micrometers, press filter dewatering is conducted; filter cakes are fed into a beehive mill to be dried and depolymerized, a modifying agent is added according to the mass ratio 1,000:(5-15) of the hydromagnesite powder to the modifying agent, and after second-time surface modification is conducted at the temperature of 110 DEG C to 180 DEG C, the superfine active hydromagnesite flame-retardant filler is obtained. According to the preparation method, wet surface organic modification is conducted while superfine grinding is conducted through the horizontal sand mill, dry surface organic modification is conducted while depolymerizing and drying are conducted through the beehive mill, and therefore the superfine active hydromagnesite flame-retardant filler which is fine in size distribution and full in surface organic modification can be prepared.

Description

technical field [0001] The invention relates to a method for preparing an ultrafine active hydromagnesite flame-retardant filler, which belongs to the technical field of mineral material processing and application. Background technique [0002] Hydromagnesite is a natural hydrated basic magnesium carbonate mineral with a chemical composition of 4MgCO 3 ·Mg(OH) 2 4H 2 O, theoretically containing MgO 42.92%, CO 2 37.77%, H 2 O 19.31%, mainly stored in the salt lake area of ​​Tibet, my country. Hydromagnesite will begin to decompose at around 220°C. The solid MgO produced by the decomposition covers the surface of the combustibles, which acts as an oxygen barrier and flame retardant. The gas H produced by the decomposition 2 O and CO 2 It can dilute the concentration of combustible gas and oxygen around, and the heat absorbed by the decomposition reaction can reduce the temperature of the surrounding environment, so hydromagnesite powder can be used as a flame-retardant ...

Claims

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Application Information

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IPC IPC(8): C08K9/06C08K9/04C08K9/00C08K3/26C08L23/08H01B3/44
CPCC08K9/06C08K3/26C08K9/00C08K9/04C08K2003/267C08K2201/003C08L2201/02C08L2203/202H01B3/441C08L23/0853
Inventor 郑水林田海山刘立新贾立新叶鹏
Owner 江苏西贝力新材料有限公司
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