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Anti-dripping agent preparation method

A technology of anti-dripping agent and anion initiator, which is applied in the production of bulk chemicals, etc., can solve the problems of energy consumption and environmental pollution, and achieve the effects of reduced energy consumption, stable product quality and good anti-dripping effect

Active Publication Date: 2010-01-20
CHANGSHU 3F ZHENFU NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, a large amount of waste water is generated in the manufacturing process, which pollutes the environment and consumes a lot of energy

Method used

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  • Anti-dripping agent preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In a 200L stainless steel coagulation kettle, add 120 kg of 30% solid content polytetrafluoroethylene emulsion, start magnetic stirring, control the stirring speed at 100 rpm, and after stirring for 6 hours, put the material into the centrifugal separator , start the centrifugal separator to separate the PTFE particles from the water. Add 35.6 kg of polytetrafluoroethylene particles into a 500L stainless steel high-pressure polymerization kettle, add 200 g of n-butyllithium, and then add 200 kg of octafluorocyclobutane. Open the steam valve of the jacket of the autoclave, raise the temperature of the autoclave system to 115 degrees Celsius, and maintain the pressure of the system at 2.8Mpa. Start stirring, after mixing 3 kilograms of styrene with 7.68 kilograms of acrylonitrile, pump it into the polymerization kettle step by step with a pump, the time of adding is 1 hour, then under the conditions of the temperature and pressure, keep warm for 5 hours. Then lower the t...

Embodiment 2

[0029] In a 200L stainless steel coagulation kettle, add 120 kg of polytetrafluoroethylene emulsion with 40% solid content, start magnetic stirring, control the stirring speed at 150 rpm, and after stirring for 6 hours, put the material into the centrifugal separator , start the centrifugal separator to separate the PTFE particles from the water. Add 48 kg of polytetrafluoroethylene particles into a 500L stainless steel autoclave, add 300 g of n-butyllithium, and then add 250 kg of octafluorocyclobutane. Open the steam valve of the jacket of the autoclave, raise the temperature of the autoclave system to 120 degrees Celsius, and maintain the pressure of the system at 3.0Mpa. Start stirring, mix 10 kilograms of styrene, 5 kilograms of acrylonitrile and 5 kilograms of butadiene, and gradually pump them into the polymerization kettle with a pump. The adding time is 2 hours, and then keep the temperature and pressure for 7 Hour. Then lower the temperature to 60 degrees Celsius, ...

Embodiment 3

[0031] In a 200L stainless steel coagulation kettle, add 120 kg of polytetrafluoroethylene emulsion with 50% solid content, start magnetic stirring, control the stirring speed at 200 rpm, and after stirring for 6 hours, put the material into the centrifugal separator , start the centrifugal separator to separate the PTFE particles from the water. Add 60 kg of polytetrafluoroethylene particles into a 500L stainless steel autoclave, add 350 g of π-allyl nickel, and then add 300 kg of octafluorocyclobutane. The steam valve of the jacket of the autoclave was opened, the temperature of the autoclave system was raised to 125 degrees Celsius, and the pressure of the system was maintained at 3.5Mpa. Start stirring, and 30 kilograms of styrene are gradually pumped into the polymerization kettle with a pump, and the time of adding is 3 hours, and then under the conditions of this temperature and pressure, keep warm for 8 hours. Then lower the temperature to 60 degrees Celsius, open the...

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Abstract

The invention discloses an anti-dripping agent preparation method; the anti-dripping agent comprises cores and shells, wherein, the cores are made from polytetrafluoethylene ultrafine powder which is prepared by mixing polytetrafluoethylene emulsion in high speed and centrifugalizing the emulsion, and the shells are prepared by adopting anionic initiator to initiate copolymerization in supercritical octafluorocyclobutane to one or more monomers of styrene, ethylene, propylene, butadiene, acrylonitrile, acrylic acid and methylacrylic acid. The specific preparation method comprises the following steps: 1. the preparation of the polytetrafluoethylene ultrafine powder: mixing polytetrafluoethylene emulsion in high speed in a condensation pot to agglomerate polytetrafluoethylene emulsion, then separating by high speed centrifugation to obtain the polytetrafluoethylene ultrafine powder; 2. the preparation of the anti-dripping agent: placing the polytetrafluoethylene ultrafine powder in a polymerizing pot and adding octafluorocyclobutane as solvent, heating to ensure that octafluorocyclobutane is in supercritical state, and mixing in high speed to keep the particle size of the polytetrafluoethylene ultrafine powder to 0.5mu m.

Description

technical field [0001] The invention relates to a preparation method of an anti-dripping agent, in particular to a method for copolymerizing one or two or more monomers of styrene, ethylene, propylene, butadiene, acrylonitrile, acrylic acid and methacrylic acid The preparation method of the polymer with polytetrafluoroethylene superfine powder as the core. Background technique [0002] The anti-dripping agent uses the principle of polytetrafluoroethylene fiberization. When the plastic is burned, the polytetrafluoroethylene is fibrous, so that the surrounding plastic is confined between the fibers, so that the plastic does not drip when it is burned. Thereby avoiding secondary fires caused by dripping of burning plastic particles. At present, the plastic casings of household appliances and the jackets of wires and cables exported to Europe / USA must add anti-dripping agents and flame retardants, and the plastic casings of these appliances and the jackets of wires and cables m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F259/08C08F2/06C08L69/00C08L51/00
CPCY02P20/54
Inventor 沈德新张平忠
Owner CHANGSHU 3F ZHENFU NEW MATERIALS CO LTD
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