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Double-layer microencapsulated red phosphorus flame retardant containing cyclodextrin as well as preparation method and application of double-layer microencapsulated red phosphorus flame retardant

A technology of microencapsulated red phosphorus and cyclodextrin, which is applied in the flame retardant field of polymer materials, can solve the problems of further improvement of flame retardant effect, weak char formation performance, and weak interaction, so as to improve interfacial compatibility, The effect of reducing impact and enhancing compatibility

Active Publication Date: 2022-03-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the intramolecular interaction between the molecular chains of polydopamine is weak, which is a reversible non-covalent interaction. It is easy to decompose and produce non-combustible gases such as nitrogen during combustion, and the char formation performance is slightly weak, and this technology is mainly composed of two flame retardant elements, phosphorus and nitrogen. , the flame retardant effect needs to be further improved

Method used

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  • Double-layer microencapsulated red phosphorus flame retardant containing cyclodextrin as well as preparation method and application of double-layer microencapsulated red phosphorus flame retardant
  • Double-layer microencapsulated red phosphorus flame retardant containing cyclodextrin as well as preparation method and application of double-layer microencapsulated red phosphorus flame retardant
  • Double-layer microencapsulated red phosphorus flame retardant containing cyclodextrin as well as preparation method and application of double-layer microencapsulated red phosphorus flame retardant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 20g of red phosphorus, 3.2g of melamine, 1.6g of boric acid, and 0.16g of sodium hexametaphosphate into 150ml of water, stir evenly at 80°C and react for 4 hours at a stirring rate of 300r / min. Then lower the temperature to 40° C., the melamine borate is precipitated, and continue to stir for 3 hours, so that the melamine borate is evenly precipitated on the surface of the red phosphorus, and the stirring rate is 500 r / min. Then vacuum filter, dry and grind to obtain melamine borate microcapsule red phosphorus.

[0040]Dissolve 5 g of β-cyclodextrin in 50 ml of pyridine and stir at 75°C for 60 minutes to completely dissolve it. Add 20 g of melamine borate microcapsule red phosphorus into 150 ml of pyridine, and stir at 75° C. for 60 minutes to make it uniformly dispersed in the solution. The above two solutions were mixed and stirred for another hour, and then 0.03 mol of toluene diisocyanate (TDI, also a trimer of toluene diisocyanate) was added dropwise to the mi...

Embodiment 2

[0042] Add 20g of red phosphorus, 3.2g of melamine, 1.6g of boric acid, and 0.16g of OP-10 into 150ml of water, stir evenly at 80°C and react for 4 hours at a stirring rate of 400r / min. Then lower the temperature to 40° C., the melamine borate is precipitated, and continue to stir for 3 hours, so that the melamine borate is evenly precipitated on the surface of the red phosphorus, and the stirring rate is 500 r / min. Then vacuum filter, dry and grind to obtain melamine borate microcapsule red phosphorus.

[0043] Dissolve 5g of β-cyclodextrin in 50ml of N,N-dimethylformamide and stir at 75°C for 60 minutes to dissolve completely. Add 20g of melamine borate microcapsule red phosphorus into 150ml of N,N-dimethylformamide, and stir at 75°C for 60 minutes to make it uniformly dispersed in the solution. The above two solutions were mixed and stirred for another hour, and then 0.03 mol of diphenylmethane diisocyanate (MDI, or a trimer of diphenylmethane diisocyanate) was added dropw...

Embodiment 3

[0045] Add 20g of red phosphorus, 3.2g of melamine, 1.6g of boric acid, and 0.16g of sodium lauryl sulfate into 150ml of water, stir evenly at 80°C and react for 4 hours at a stirring rate of 400r / min. Then lower the temperature to 40° C., the melamine borate is precipitated, and continue to stir for 3 hours, so that the melamine borate is evenly precipitated on the surface of the red phosphorus, and the stirring rate is 500 r / min. Then vacuum filter, dry and grind to obtain melamine borate microcapsule red phosphorus.

[0046] Dissolve 5 g of β-cyclodextrin in 50 ml of dimethyl sulfoxide, and stir at 75° C. for 60 minutes to completely dissolve it. Add 20 g of melamine borate microcapsule red phosphorus into 150 ml of dimethyl sulfoxide, and stir at 75° C. for 60 minutes to make it uniformly dispersed in the solution. The above two solutions were mixed, stirred for another hour, and then 0.03 mol of hexamethylene diisocyanate (HDI, also a trimer of hexamethylene diisocyanate...

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Abstract

The invention discloses a cyclodextrin-containing double-layer microencapsulated red phosphorus flame retardant as well as a preparation method and application thereof. According to the flame retardant, firstly, melamine and boric acid are dissolved in water at high temperature, amino groups of the melamine and hydroxyl groups of the boric acid are combined through ionic bonds, and after the temperature is lowered, the melamine and the boric acid are precipitated on the surface of red phosphorus to form a first coating layer; and then cyclodextrin reacts with polyisocyanate, so that a cross-linked cyclodextrin coating layer is formed on the surface of the melamine borate microencapsulated red phosphorus. The obtained flame retardant is not prone to water absorption, good in compatibility with polymers, resistant to melt drops, excellent in flame retardant effect and excellent in comprehensive performance, and compared with the prior art, due to the fact that the flame retardant contains three flame retardant elements of boron, nitrogen and phosphorus, and a gas source and a carbon source are introduced into a system at the same time, the double-layer microencapsulated red phosphorus has the characteristics of an intumescent flame retardant, and the flame retardant performance of the double-layer microencapsulated red phosphorus is greatly improved. The flame retardant has obvious advantages in flame retardant property, and has good compatibility with a base material, and the prepared material has excellent mechanical properties.

Description

technical field [0001] The invention relates to the technical field of flame retardancy of polymer materials, in particular to a cyclodextrin-containing double-layer microcapsule red phosphorus flame retardant and a preparation method and application thereof. Background technique [0002] With the continuous in-depth research of polymer materials by scientists, the types of polymer materials have proliferated, and they have many superior properties, and are widely used in industrial production and daily life. However, most polymer materials are flammable, which hinders their application in more fields, and the use of flame retardants can significantly enhance the flame retardancy of polymer materials. [0003] As a highly efficient halogen-free flame retardant, red phosphorus has the advantages of low price, low toxicity, green environmental protection and low smoke generation. However, red phosphorus also has major defects. Red phosphorus easily absorbs water in the air an...

Claims

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Application Information

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IPC IPC(8): C08K9/10C08K3/02C08K5/3492C08K3/38C08L77/02
CPCC08K9/10C08K3/02C08K5/34928C08K3/38C08K2003/026C08K2003/387C08L2201/02C08L77/02
Inventor 刘俊邦刘平艾梁辉冯天赐
Owner SOUTH CHINA UNIV OF TECH
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