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A kind of preparation method of phosphorus-containing flame-retardant polyethylene cable material
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A flame retardant polyethylene and cable material technology, applied in chemical instruments and methods, circuits, electrical components, etc., can solve problems such as difficulty in ensuring flame retardant effects
Inactive Publication Date: 2020-12-08
LANZHOU UNIVERSITY OF TECHNOLOGY +1
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However, the flame retardants used are all inorganic flame retardants, which are easily precipitated from the polyethylene matrix by the effects of water vapor, light, heat, etc. in the environment during the service life of the cable, making it difficult to guarantee the same period of flame retardancy during long-term use. Effect
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preparation example Construction
[0024] The invention is a preparation method of phosphorus-containing flame-retardant polyethylene cable material, the steps of which are as follows:
[0025] (1) The steps to synthesize DHPP are:
[0026] Add 4,4'-dihydroxybenzophenone, solvent, and acid-binding agent into a reaction vessel equipped with a stirring device and a temperature control device; under inert gas protection conditions, stir at 20~-30°C for 30 minutes, then add chlorophosphoric acid Diphenyl ester, stirred at 20-30°C for 1 hour after the addition, the system changed from cloudy to clear, quenched the reaction with water, extracted 3 times with dichloromethane, washed the organic phase with deionized water 3 times, evaporated the dichloromethane to dryness under reduced pressure, A colorless liquid was obtained, and the product was separated and purified by column chromatography, and the column chromatography was petroleum ether:ethyl acetate=5:1 according to V / V, and a white solid 4,4'-diphenyl phospha...
Embodiment 1
[0047] Add 12 parts of 4,4'-dihydroxybenzophenone, 120 parts of solvent and 5 parts of triethylamine into the reaction vessel equipped with mechanical stirring and temperature control device. Blow nitrogen, stir at 20-30°C for 30 minutes, then add 30 parts of diphenyl chlorophosphate, stir at 20-30°C for 1 hour after the addition, the system turns from cloudy to clear, add water to quench the reaction, evaporate the solvent under reduced pressure, and use dichloromethane Extracted 3 times, the organic phase was washed 3 times with deionized water, dichloromethane was evaporated to dryness under reduced pressure to obtain a colorless liquid, and the product was separated and purified by column chromatography (petroleum ether: ethyl acetate=5:1, V / V). DHPP was obtained as a white solid.
Embodiment 2
[0049] Add 80 parts of DHPP, 100 parts of ethanol, and 8 parts of sodium borohydride into a reaction vessel equipped with a mechanical stirring and temperature control device. Stir at 20-30°C for 6 hours after the addition, the system turns from turbid to clear, add 15 parts of sodium hydroxide (5%wt) solution, the system becomes turbid, stir for 5 minutes, the system turns from turbid to clear. The solvent was evaporated to dryness under reduced pressure to obtain a milky white liquid, which was then extracted 3 times with dichloromethane, the organic phase was washed 3 times with deionized water, and the dichloromethane was evaporated to dryness under reduced pressure to obtain a colorless liquid. : 1, V / V) separation and purification product, obtains colorless transparent liquid DHPP-OH.
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Abstract
The invention discloses a preparation method of a phosphorus-containing flame-retardant polyethylene cable material. The preparation method comprises the following steps: through molecular design, firstly, performing a reaction on 4,4'-dihydroxybenzophenone (DHBP) and diphenylchlorophosphate (DPCP) to obtain 4,4'-diphenyl diphosphatebenzophenone (DHPP), reducing the 4,4'-diphenyl diphosphatebenzophenone (DHPP) as a raw material by using sodium borohydride to obtain 4,4'-diphenyl diphosphatebenzhydrol (DHPP-OH), then synthesizing 1,4-bis[(4,4'-diphenyl diphosphatediphenylmethoxy)formyl]aniline(DHPP-OH-NCO) from the DHPP-OH and p-phenyl diisocyanate (NCO), and preparing the flame-retardant polyethylene cable material from the DHPP-OH-NCO. The DHPP-OH-NCO is an organic flame retardant, has high compatibility in polyethylene, has less addition amount than an inorganic flame retardant, has less influence on the mechanical properties of the polyethylene, and can guarantee long-lasting flameretardance of the phosphorus-containing flame-retardant polyethylene cable material.
Description
technical field [0001] The invention relates to the preparation technology of phosphorus-containing flame-retardant polyethylene cable material, and belongs to the technical field of polymer materials. Background technique [0002] Wires and cables are widely used in various industries of the national economy, are closely related to people's daily life, and play a vital role in power transmission, signal control and other fields. Most wire and cable insulation and sheath materials are organic polymer materials. Polyethylene is widely used in wire and cable insulation and sheath materials due to its excellent insulation, wear resistance, easy processing, corrosion resistance and long service life. However, it is easy to degrade under high temperature conditions, and its defects such as flammability under fire conditions will further increase the fire loss. Therefore, it must be flame retardant to be safely used as wire and cable insulation and sheath materials. [0003] Pat...
Claims
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