Preparation of environment-protective glass fibre flame-retardant nylon flame retardant

Abstract

The invention discloses a preparation method of a flame retardant of environment-protective fiberglass retardant nylon. At first, diammonium phosphate, phosphorus pentoxide, carbamide and a multi-amino group compound are added into a kneader according to a proportion and are reacted for 4 to 12 hours under an ammonia atmosphere to obtain modified APP; then the APP is dispersed in solvent and cation surface activator is added to carry out ion exchange reaction with cyanamide salt for 1 to 10 hours under the situations of micro-boiling and circumfluence of the solvent; after the reaction is finished, the nitrogen-phosphor flame retardant used for nylon is obtained after the reagent is cooled, filtered, washed and dried. The flame retardant prepared by the invention has more uniform chemical components, better thermal stability, more excellent compatibility with nylon as well as more excellent flame retardant performance and more reasonable price. No corrosive and poisonous compounds are generated during the use process of the flame retardant. The product prepared by the invention is mainly used as the flame retardant of fiberglass reinforced retardant nylon and fiberglass reinforced retardant polyester.

Description

technical field [0001] The invention relates to a preparation method of a flame retardant, in particular to a preparation method of an environment-friendly glass fiber flame retardant nylon flame retardant. Background technique [0002] At present, the flame retardants used for glass fiber reinforced nylon resin compositions on an industrial scale are mainly halogen-containing flame retardants or red phosphorus. However, these flame retardants have obvious disadvantages. For example, halogen flame retardants have several disadvantages: ① Materials containing halogen flame retardants may poison people when burned in a fire; Toxic substances pollute the atmospheric environment; ③ when this type of plastic is formulated and processed, it may harm the health of workers. Red phosphorus flame retardants also have several disadvantages: ①During processing, red phosphorus generates phosphine and further leads to end products with inherent dark red or dark brown color; ②Materials co...

AI Technical Summary

Problems solved by technology

However, these flame retardants have obvious disadvantages. For example, halogen flame retardants have several disadvantages: ① Materials containing halogen flame retardants may poison people when burned in a fire; Toxic substances pollute the air environment; ③ when this type of plastic is formulated and processed, it may harm the health of workers

Red phosphorus flame retardants also have several disadvantages: ①During processing, red phosphorus generates phosphine and further leads to end products with inherent dark red or dark brown color; ②Materials containing red phosphorus flame retardants Burning in a fire will also release poisonous gas, causing poisoning

[0003] Melamine cyanurate is also widely used in the flame retardancy of nylon resin compositions, but it is used in glass fiber reinforced nylon resin compositions, which cannot meet sufficient flame retardancy requirements

However, they still have several disadvantages: ①Although they have a certain flame retardant effect, they still cannot meet the flame retardant requirements for use; ②The compatibility with nylon is not good, resulting in limited performance of glass fiber reinforced nylon resin compositions ; ③ The electrical performance of the flame retardant is poor, resulting in a low leakage trace index (CTI) of the product

The use of melamine polyphosphate in glass fiber reinforced nylon compositions can achieve a combustion rating of 94V0 (1.6mm), but its electrical performance defects and high price determine the limitations of its application range.

[0007] Patents such as US6547992, US6255371, US2004021135A1, and US2006058432A1 disclose the application of non-halogen flame retardants based on organic hypophosphite esters in glass fiber reinforced nylon, such as: the OP1311 and OP1312 series of flame retardants developed by Exolit, Germany, which are used in flame retardants. It shows excellent performance in terms of combustion, mechanics and electricity, but its very expensive price greatly limits its application range.