Phosphorus-nitrogen-carbon intumescent flame retardant and preparation method thereof
An intumescent flame retardant, phosphorus-nitrogen technology, applied in the field of phosphorus-nitrogen-carbon intumescent flame retardants and their preparation, can solve the problems of difficulty in adding flame retardants, affecting personnel escape, flammability of materials and dripping, etc. The effect of avoiding flame spread, easy industrialization, and simple method
Inactive Publication Date: 2012-10-17
HEFEI UNIV OF TECH
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Problems solved by technology
Many fires are caused by insulation fires caused by cable overload or short circuit. Although PVC insulation itself has a certain flame retardant effect, PVC insulation will release a lot of smoke and toxic gases when it is on fire, and it is easy to drip when burning. , so it will not only cause fire, but also affect the escape of personnel, and XLPE insulation is difficult to add flame retardants, domestic XLPE insulation basically does not add flame retardants, so this material is also flammable and dripping, causing a fire
The existing technology is to add inorganic flame retardants such as magnesium hydroxide or aluminum hydroxide to XLPE insulation. This inorganic flame retardant has a great influence on the mechanical and electrical properties of XLPE, and is not easy to process, so it is rarely used. In the field of wire and cable
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[0021] 1. Add 0.1mol of pentaerythritol to 50ml of 1,4-dioxane, heat to 50±5°C, then slowly add 0.2mol of phosphorus oxychloride dropwise, after the dropwise addition, raise the temperature to 60±5°C, and keep it warm for 4h , then heated up to 105°C, kept for 2 hours, and dried;
[0022] 2. Weigh 0.05mol of the product obtained in step 1 and add it to 50ml of N,N-methylformamide. Keep the temperature of the ice-water bath at 10~15°C, and slowly add 0.5mol of ethylenediamine and 5ml of N,N-methylformamide dropwise. For the mixed solution of formamide, keep it warm for 1.5 hours after the dropwise addition, then raise the temperature to 30~40°C, keep it for 2 hours, filter it with suction, wash it with water, and dry it to get a white powdery solid which is the flame retardant.
[0023] 3. Mix 30-10 parts of the flame retardant prepared by the present invention, 1-4 parts of the catalyst dibutyltin dilaurate and silane-grafted linear low-density polyethylene (Shanghai Xinshang ...
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Abstract
The invention discloses a phosphorus-nitrogen-carbon intumescent flame retardant and a preparation method thereof. The general structural formula of the intumescent flame retardant is shown in the specification, wherein n is the degree of polymerization and ranges from 10-1000. The flame retardant has good flame retardance effect after being added to silane crosslinked polyethylene insulating materials in a certain proportion and can not release toxic gases or lots of smoke during combustion, thus being environment-friendly.
Description
1. Technical field [0001] The invention relates to a phosphorus-nitrogen-carbon expansion flame retardant and a preparation method thereof, belonging to the field of flame-retardant polymer materials. 2. Background technology [0002] According to the statistics of the National Fire Administration, 30% of fires in China are caused by fire cables. Since traditional cables mostly use polyvinyl chloride (PVC) insulation and cross-linked polyethylene (XLPE) insulation, that is, flame retardant cables and insulating materials do not add flame retardants, but are used in cable sheath materials. Flame retardant material. Many fires are caused by insulation fires caused by cable overload or short circuit. Although PVC insulation itself has a certain flame retardant effect, PVC insulation will release a lot of smoke and toxic gases when it is on fire, and it is easy to drip when burning. , so it will not only cause fire, but also affect the escape of personnel, and XLPE insulation ...
Claims
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IPC IPC(8): C08G79/04C08L51/06C08L27/06C08L85/02
Inventor 史铁钧余乐华
Owner HEFEI UNIV OF TECH