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Preparation method of microencapsulated gradient halogen-free flame retardant system

A technology of microencapsulation and inorganic flame retardants, which is applied in the field of composite materials, can solve the problems of poor compatibility between halogen-free flame Good combustion effect, low cost, and the effect of improving flame retardancy

Inactive Publication Date: 2012-06-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are some deficiencies in existing flame retardants and flame retardant technology, which are mainly manifested in the following aspects: Although halogenated flame retardants have good flame retardant effects, the amount of flame retardants is small, and the compatibility with flame retardants Good and other advantages, but halogen-based flame retardants will produce harmful halogen and hydrogen halide gases during the combustion process, which seriously pollutes the atmosphere; halogen-free flame retardants have the advantages of environmental friendliness, but halogen-free flame retardant When the flame retardant has the same flame retardant effect as the halogen-based flame retardant, the amount of flame retardant used is large, and the compatibility between the halogen-free flame retardant and the flame retardant is poor, and it is easy to be removed from the flame retardant during storage or transportation. Precipitation in the middle, resulting in a decline in flame retardant performance; a single flame retardant can no longer fully meet the requirements of today's polymer flame retardant, and the synergistic effect of multiple flame retardants is an effective way to improve the performance of halogen-free flame retardants

Method used

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  • Preparation method of microencapsulated gradient halogen-free flame retardant system
  • Preparation method of microencapsulated gradient halogen-free flame retardant system
  • Preparation method of microencapsulated gradient halogen-free flame retardant system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] ——Microencapsulation of halogen-free flame retardants:

[0030] a. After uniformly mixing 2.0 grams of ammonium polyphosphate and 1.0 grams of aluminum hydroxide, disperse them in 80 ml of chloroform, then transfer them to a four-necked flask with mechanical stirring and condenser, and heat at a stirring speed of 300 rpm At 55°C, add 30ml of chloroform solution containing 0.1g of toluene diisocyanate dropwise, and then gradually add 0.05g of melamine into the system after the dropwise addition, and continue the reaction for 7 hours, then stop heating and stirring.

[0031] b. Vacuum suction filtration, wash twice with chloroform, then rinse twice with slightly hot distilled water, collect the filter cake, and dry it in a constant temperature vacuum drying oven at 50°C for 12 hours to finally obtain microencapsulated halogen-free barrier Fuel. Calculate the efficiency of microencapsulation.

[0032]

[0033] - Surface modification of pentaerythritol:

[0034] a. Pu...

Embodiment 2

[0040] ——Microencapsulation of halogen-free flame retardants:

[0041] a. After uniformly mixing 1.5 grams of ammonium phosphate and 1.5 grams of aluminum hydroxide, disperse them in 80 ml of chloroform, then transfer them to a four-necked flask with mechanical stirring and condenser, and the stirring speed is 300 rpm and heated to At 55°C, add 40ml of chloroform solution containing 0.1g of toluene diisocyanate dropwise. After the dropwise addition, gradually add 0.06g of melamine into the system and continue the reaction for 7 hours before stopping heating and stirring.

[0042] b. Vacuum suction filtration, wash twice with chloroform, then rinse twice with slightly hot distilled water, collect the filter cake, and dry it in a constant temperature vacuum drying oven at 50°C for 12 hours to finally obtain microencapsulated halogen-free barrier Fuel. Calculate the efficiency of microencapsulation.

[0043]

[0044] - Surface modification of pentaerythritol:

[0045] a. Put ...

Embodiment 3

[0051] ——Microencapsulation of halogen-free flame retardants:

[0052] a. After 1.5 grams of ammonium phosphate and 1.5 grams of magnesium hydroxide are evenly mixed, they are dispersed in 80ml of chloroform, and then transferred to a four-necked flask with mechanical stirring and condenser, and the stirring speed is 300 rpm and heated to At 55°C, add 20ml of chloroform solution containing 0.1g of diphenylmethane diisocyanate dropwise, and then gradually add 0.07g of melamine into the system after the dropwise addition, and continue the reaction for 7 hours, then stop heating and stirring.

[0053] b. Vacuum suction filtration, wash twice with chloroform, then rinse twice with slightly hot distilled water, collect the filter cake, and dry it in a constant temperature vacuum drying oven at 50°C for 12 hours to finally obtain microencapsulated halogen-free barrier Fuel. Calculate the efficiency of microencapsulation.

[0054]

[0055] - Surface modification of pentaerythrit...

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Abstract

The invention relates to a preparation method of a microencapsulated gradient halogen-free flame retardant system. The preparation method comprises the steps of: mixing a phosphorus-series flame retardant with an inorganic flame retardant according to a certain ratio to obtain a microencapsulated halogen-free flame retardant, then carrying out surface modification on a charring agent, and then mixing the microencapsulated halogen-free flame retardant, a phosphorus-containing organic flame retardant and surface-modified charring agent according to a certain ratio to obtain the microencapsulated gradient halogen-free flame retardant system. By using the system, distributed gradient flame retarding is realized, the flame retardancy of a polymer material is greatly improved, the defect that compatibility between the flame retardant and the polymer is poor is solved, the migration of the halogen-free flame retardant from the polymer matrix under high-temperature and moisture conditions is significantly reduced, and the long-term storage of a flame-retardant polymer material is facilitated. The method has the characteristics of simple process, convenience for operation, environmental friendliness, and lower cost. The obtained flame retardant system has good flame retarding effect and wide application field.

Description

technical field [0001] The invention relates to a composite material, especially a preparation method of a microencapsulated gradient halogen-free flame retardant system with excellent flame retardancy. Background technique [0002] Entering the 21st century, polymer materials have entered our lives and are widely used in many fields such as electricity, transportation, construction, and military industry. However, the vast majority of polymers are flammable. As long as they encounter a fire source, they will be ignited in the air and then burn. The molten droplets can also ignite other combustibles. They generate a lot of heat and high temperature during the combustion process, easily generate incompletely burned black smoke, and release toxic and corrosive gases, which brings difficulties to firefighting and lifesaving work. As the world's safety and fire prevention standards become increasingly stringent, the global flame retardant market demand has been increasing. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K13/06C08K9/10C08K3/32C08K3/22C08K9/04C08K5/053C08K5/49C08K5/523C08K5/521B01J13/02
Inventor 王洪艳郑再航高岩孟繁雨赵天琦
Owner JILIN UNIV
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