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Halogen-free flame retardant and application thereof in preparation of halogen-free flame-retardant PA6

A technology of flame retardant and graphite phase carbon nitride, which is applied in the field of polymer flame retardant materials, can solve the problems that the flame retardant effect cannot be fully exerted and is difficult to disperse, and achieve uniform dispersion and stability, and strengthen uniform dispersion Effect

Pending Publication Date: 2021-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems existing in the prior art, the first object of the present invention is to provide a kind of halogen-free flame retardant, and this halogen-free flame retardant is graphite-like carbon nitride (g-C 3 N 4 ) or g-C 3 N 4 A compound composed of a metal flame retardant, the halogen-free flame retardant can use g-C 3 N 4 The surface amino group grafted PA6 through chemical bonding, so that the g-C with excellent flame retardant properties 3 N 4 And metal flame retardants are evenly dispersed in PA6 materials, endowing PA6 with high flame retardancy, overcoming the defects that existing conventional flame retardants are difficult to disperse in PA6 materials and cannot fully exert the flame retardant effect

Method used

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  • Halogen-free flame retardant and application thereof in preparation of halogen-free flame-retardant PA6
  • Halogen-free flame retardant and application thereof in preparation of halogen-free flame-retardant PA6
  • Halogen-free flame retardant and application thereof in preparation of halogen-free flame-retardant PA6

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 500g of caprolactam in the reaction kettle, add 40mL of distilled water into the reaction kettle, pass through nitrogen and vacuumize, go through 5 cycles to exhaust the air in the kettle, stir fully, raise the temperature to 255°C, maintain the pressure at 0.55MPa, and react 4h, release the pressure to normal pressure, keep vacuuming, and fill with nitrogen for 1.5h; Dry in a drying oven at 95°C to obtain PA6 material. Sample preparation of the obtained product was carried out for combustion performance test, and the results are shown in Table 1.

Embodiment 2

[0027] Weigh 10g of melamine and place it in a crucible, wrap it with tin foil, calcinate at 600°C for 4h, take it out after it is naturally cooled to room temperature, wash it with distilled water, filter it with suction, and dry it; put 5g g-C 3 N 4 Mix with 495g caprolactam in the reaction kettle, heat to 95°C, stir for 1 hour to obtain a uniform mixture; add 40mL distilled water to the reaction kettle, feed nitrogen and vacuumize, cycle 5 times, exhaust the air in the kettle, stir, and heat up To 255°C, maintain the pressure at 0.55MPa, react for 4 hours, release the pressure to normal pressure, continue vacuuming, and fill with nitrogen for 1.5 hours; times; dry the obtained product in a vacuum drying oven at 95°C to obtain a flame-retardant PA6 composite material. Sample preparation of the obtained product was carried out for combustion performance test, and the results are shown in Table 1.

Embodiment 3

[0029] Weigh 10g of melamine and 8.37g of magnesium chloride hexahydrate, mix them evenly, dry them at 50°C, place them in a crucible, wrap them in tin foil, and calcinate them at 600°C for 4h, after they are naturally cooled to room temperature, take them out, wash them with distilled water, filter them with suction, and bake them. dry; 5 g of prepared g-C 3 N 4 / MgO and 495g caprolactam were mixed in a reaction kettle, heated to 95°C, stirred for 1 hour to obtain a uniform mixture; 40mL of distilled water was added to the reaction kettle, nitrogen was introduced and vacuumized, and the air in the kettle was exhausted after 5 cycles. Stir well, raise the temperature to 255°C, maintain the pressure at 0.55MPa, react for 4 hours, release the pressure to normal pressure, continue vacuuming, and fill with nitrogen for 1.5 hours; after the reaction, the product is cooled and drawn in water, pelletized and extracted in boiling water for 10 hours , changing the water 5 times; dryin...

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PUM

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Abstract

The invention discloses a halogen-free flame retardant and application thereof in preparation of halogen-free flame-retardant PA6. The halogen-free flame retardant comprises graphite-like phase carbon nitride or a compound of graphite-like phase carbon nitride and a metal flame retardant, and is applied to preparation of the halogen-free flame-retardant PA6 by an in-situ copolymerization method. The halogen-free flame retardant can be grafted through g-C3N4 and caprolactam in the caprolactam polymerization process, uniform dispersion of the halogen-free flame retardant in polycaprolactam is achieved, PA6 is endowed with excellent composite flame retardant performance, and the dosage of the flame retardant can be reduced.

Description

technical field [0001] The invention relates to a flame retardant, in particular to a modified flame retardant obtained by modifying graphite-like carbon nitride and a metal flame retardant, and also to an in-situ copolymerization method of the modified flame retardant The application in the preparation of halogen-free flame-retardant PA6 belongs to the field of polymer flame-retardant materials. [0002] technical background [0003] Due to its excellent mechanical properties, PA6 is widely used in many fields such as automobiles, machinery, electrical appliances, engineering accessories, chemicals, daily necessities, aerospace and building materials. Compared with PA66, in addition to the advantages of excellent toughness, specific strength and wear resistance, PA6 also has the advantages of impact resistance and dissolution resistance. Although PA6 products have various excellent performances, they have the disadvantage of being flammable, that is, the risk of fire, and P...

Claims

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Application Information

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IPC IPC(8): C08K9/12C08K3/28C08K3/22C08G69/14C08G69/16
CPCC08K9/12C08K3/28C08K3/22C08G69/14C08G69/16C08K2003/222
Inventor 刘耀驰伍千新李先华肖朝晖郑涛
Owner CHINA PETROLEUM & CHEM CORP
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