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Organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant and preparation method thereof

An acrylate and silicone technology, applied in the field of silicone-phosphorus-containing acrylate core-shell toughening flame retardant and its preparation, can solve the problems of low phosphorus content and insignificant flame retardant effect, and achieve high residual quality , to solve the effect of mechanical properties

Active Publication Date: 2022-04-08
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the organosilicon modified toughening agent has the disadvantages of low phosphorus content, and the flame retardant effect is not obvious when used alone.

Method used

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  • Organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant and preparation method thereof
  • Organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant and preparation method thereof
  • Organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant, comprising the following steps:

[0037] (1) Mix 24.5g of octamethylcyclotetrasiloxane (D4), 0.5g of KH-570, 0.375g of sodium dodecyl sulfate (SDS) and 37.5mL of deionized water at a stirring speed of 600rpm Pre-emulsification for 0.5h;

[0038] (2) Add 20% pre-emulsion, 0.25g SDS and 25mL deionized water into a 250ml three-neck flask, heat it in a constant temperature water bath to 80°C to initiate polymerization, and keep the rotation speed at 180rpm;

[0039] (3) After the blue light appeared in the flask, start to add the remaining pre-emulsion dropwise. After the dropwise addition, stir and react for 3 hours and cool down to 25°C to obtain polysiloxane core emulsion;

[0040] (4) Use 3.0wt% NaOH solution to adjust the pH value of the polysiloxane core emulsion to 8 to obtain an alkaline polysiloxane core emulsion;

[0041] (5) Mix 5g of diethyl methylphosph...

Embodiment 2

[0047] A preparation method of organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant, comprising the following steps:

[0048] (1) Mix 22g octamethylcyclotetrasiloxane (D4), 3g KH-570, 0.375g sodium dodecyl sulfate (SDS) and 37.5mL deionized water, and pre-emulsify at a stirring speed of 600rpm 0.5h;

[0049] (2) Add 20% pre-emulsion, 0.25g SDS and 25mL deionized water into a 250ml three-neck flask, heat it in a constant temperature water bath to 80°C to initiate polymerization, and keep the rotation speed at 180rpm;

[0050] (3) After the blue light appeared in the flask, start to add the remaining pre-emulsion dropwise. After the dropwise addition, stir and react for 3 hours and cool down to 25°C to obtain polysiloxane core emulsion;

[0051] (4) Use 3.0wt% NaOH solution to adjust the pH value of the polysiloxane core emulsion to 8 to obtain an alkaline polysiloxane core emulsion;

[0052] (5) Mix 5g of diethyl methylphosphonate acrylate (DEAMP...

Embodiment 3

[0057] A preparation method of organosilicon-phosphorus-containing acrylate core-shell toughening flame retardant, comprising the following steps:

[0058] (1) Mix 20g octamethylcyclotetrasiloxane (D4), 5g KH-570, 0.375g sodium dodecyl sulfate (SDS) and 37.5mL deionized water, and pre-emulsify at a stirring speed of 600rpm 0.5h;

[0059] (2) Add 20% pre-emulsion, 0.25g SDS and 25mL deionized water into a 250ml three-neck flask, heat it in a constant temperature water bath to 80°C to initiate polymerization, and keep the rotation speed at 180rpm;

[0060] (3) After the blue light appeared in the flask, start to add the remaining pre-emulsion dropwise. After the dropwise addition, stir and react for 3 hours and cool down to 25°C to obtain polysiloxane core emulsion;

[0061] (4) Use 3.0wt% NaOH solution to adjust the pH value of the polysiloxane core emulsion to 8 to obtain an alkaline polysiloxane core emulsion;

[0062] (5) Mix 5g of diethyl methylphosphonate acrylate (DEAMP...

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Abstract

The invention provides an organic silicon-phosphorus-containing acrylate core-shell toughening flame retardant and a preparation method thereof, and belongs to the technical field of design and synthesis of flame retardants. The organic silicon-phosphorus-containing acrylate core-shell toughening flame retardant provided by the invention is prepared by taking octamethylcyclotetrasiloxane as a core layer (D4), KH570 as a cross-linking agent and diethyl methylphosphonate acrylate (DEAMP) and DOPO acrylate as a shell layer through an emulsion polymerization method. The toughening flame retardant prepared by the invention has dual functions of a core-shell elastomer and a macromolecular flame retardant, and the glass-transition temperature of a rubber phase is far lower than room temperature; the phosphorus content is high, and the P-Si synergistic flame-retardant effect is achieved; the initial thermal decomposition temperature is higher than 360 DEG C, and the residual mass after decomposition is higher than 30%.

Description

technical field [0001] The invention relates to the technical field of flame retardant design and synthesis, in particular to an organosilicon-phosphorus-containing acrylate core-shell toughened flame retardant and a preparation method thereof. Background technique [0002] At present, in order to improve the shortcoming of thermoplastic polymer materials being damaged in toughness after flame retardancy, physical blending of core-shell rubber (CSR) particles is often used for toughening. Such CSR particles are usually formed by emulsion polymerization and have a soft rubbery core layer and a harder shell layer of a plastic phase. Typical core materials include polybutylacrylate, polybutadiene, acrylate-polyurethane and siloxane, etc., and shell materials are usually polymethylmethacrylate ((CN202011164362.6; CN202111200846.6; CN202111052659.8 Sun Jiaheng. Synthesis and application of large particle size core-shell structure polysiloxane-acrylate elastomer [D]. South China ...

Claims

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Application Information

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IPC IPC(8): C08F283/12C08F230/08C08F230/02
CPCY02E60/10
Inventor 闫莉高雪雨陈兴刚桑晓明
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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