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Preparation method of superfine 2335 zinc borate fire retardant

A technology of zinc borate and flame retardant, applied in borates, chemical instruments and methods, boron compounds, etc., can solve the problems of expensive zinc oxide, difficult to achieve flame retardant effect, and low cost of borax method

Inactive Publication Date: 2015-05-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0003] There are three main methods for preparing zinc borate, namely, boric acid zinc oxide method, boric acid zinc hydroxide method and borax zinc salt method. The problem with the zinc oxide method is that zinc oxide is relatively expensive. The problem with the zinc hydroxide method is that zinc hydroxide requires on-site Preparation, the cost of borax method is relatively low, material circulation is required, and the processing procedure is relatively complicated
The latter uses borax, zinc sulfate and boric acid as main raw materials, and replaces zinc oxide with boric acid, which greatly reduces the reaction time. The problem with this method is that the reaction temperature must be above 90°C, and the particle size of the obtained zinc borate can only be 6 μm Below, it is still difficult to achieve a good flame retardant effect

Method used

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  • Preparation method of superfine 2335 zinc borate fire retardant

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Effect test

Embodiment 1

[0027] First, add 1500ml of water and 1000g of zirconia microspheres with a particle size of 2.3 to 3.0mm into the reactor, start stirring, raise the temperature to 70°C, add 300g of boric acid and 350g of borax decahydrate, after completely dissolving, add 250g of zinc sulfate heptahydrate and 10g of zinc oxide, control the reaction temperature at 80°C, react for 3.5h, separate the inert microspheres with a filter screen after the reaction and filter while hot, wash the filter cake with hot water twice, recover the filtrate, and dry the filter cake at 80°C 2.5h, the zinc borate flame retardant is obtained, and its composition is 2ZnO·3B 2 o 3 3.5H 2 O, the median particle size d(50) is 0.918 μm.

Embodiment 2

[0029] First, add 2000ml of water, 500g of 1.0-1.8mm particle size and 500g of 2.3-3.0mm particle size zirconia microspheres into the reactor, start stirring, raise the temperature to 70°C, add 380g of boric acid and 420g of borax decahydrate, and wait until completely dissolved , add 350g of zinc sulfate heptahydrate and 15g of zinc oxide, control the reaction temperature at 80°C, and react for 4 hours. After the reaction, use a filter to separate the inert microspheres and filter while hot, wash the filter cake twice with hot water, and recover the filtrate. Dry the filter cake at 80°C for 3 hours to obtain the zinc borate flame retardant, whose composition is 2ZnO·3B 2 o 3 3.5H 2 O, the median particle size d(50) is 0.992 μm.

Embodiment 3

[0031] First, add 1800ml of water, 300g of zirconia microspheres with a particle size of 1.0 to 1.8mm, 300g of 1.8 to 2.3mm and 400g of zirconia microspheres with a particle size of 2.3 to 3.0mm, start stirring, raise the temperature to 70°C, and add 360g of boric acid and 400g of boric acid After the borax decahydrate is completely dissolved, add 335g of zinc sulfate heptahydrate and 13g of zinc oxide, control the reaction temperature at 80°C, and react for 3.5h. After the reaction, use a filter to separate the inert microspheres and filter while they are hot. Wash the filter cake twice, recover the filtrate, and dry the filter cake at 80°C for 3.5 hours to obtain the zinc borate flame retardant, whose composition is 2ZnO·3B 2 o 3 3.5H 2 O, the median particle size d(50) is 0.935 μm.

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Abstract

The invention provides a preparation method of superfine 2335 zinc borate fire retardant. The fire retardant is prepared from boric acid, sodium borate, zinc sulfate and zinc oxide and the like in the presence of inert microspheres serving as both abradant and a dispersing agent according to a certain proportion and process. The superfine 2335 zinc borate fire retardant prepared by the method has small particle diameter, the median particle diameter d (50) is in the range of 0.5-1.2mu m. The preparation method is simple and the cost is low; the process is clean and environmentally friendly, and pollutant emission is avoided; the superfine 2335 zinc borate fire retardant prepared by the invention has stable and excellent fire retarding and smoke inhibiting performances, so the superfine 2335 zinc borate fire retardant is widely used in products such as plastic, rubber, wire cable, coating and painting.

Description

technical field [0001] The invention relates to a method for preparing an ultrafine 2335 zinc borate flame retardant, belonging to the technical field of inorganic material synthesis. technical background [0002] Zinc borate has the functions of flame retardancy and smoke suppression. It is an environmentally friendly non-halogen flame retardant. It can be used alone or in combination. It is widely used in plastics, rubber, wires and cables, electronic product casings, coatings, paints, etc. Special flame retardant material for rubber conveyor belts and radial tires. There are many kinds of zinc borates, among which the molecular composition is 2ZnO·3B 2 o 3 3.5H 2 O, also known as 2335 zinc borate, is the most representative flame retardant with good flame retardant effect and widely used. The particle size of zinc borate directly affects its dispersibility in other materials, which in turn affects the flame retardant effect and dosage, and finally affects the producti...

Claims

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Application Information

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IPC IPC(8): C01B35/12
CPCC01B35/127C01P2004/62
Inventor 王云山杨刚张金平郝云鹏王超安学斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI