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Flame-retardant modified PMMA (polymethylmethacrylate) microspheres and preparation method thereof

A technology of polymethyl methacrylate and microspheres, applied in coating and other directions, can solve the problem of low flame retardant level, and achieve the effect of improving flame retardant performance, realizing dispersibility, and requiring low operating conditions

Active Publication Date: 2017-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the combination of various inorganic nanoparticles has been applied in polymers to improve their fire safety performance, but the flame retardant level of commonly used nanocomposite technology is generally low

Method used

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  • Flame-retardant modified PMMA (polymethylmethacrylate) microspheres and preparation method thereof
  • Flame-retardant modified PMMA (polymethylmethacrylate) microspheres and preparation method thereof
  • Flame-retardant modified PMMA (polymethylmethacrylate) microspheres and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Pretreatment of polymethyl methacrylate (PMMA) microspheres: Soak polymethyl methacrylate microspheres in isopropanol for 45 seconds, and then centrifuge at 8000 rpm for 12 minutes to obtain a precipitate. Processed PMMA microspheres, standby;

[0056] (2) Preparation of graphite phase carbon nitride suspension: 5g graphite phase carbon nitride (g-C 3 N 4 ) into 300mL of isopropanol, ultrasonicated for 4 hours to obtain a suspension, then sequentially added 4.5g of acetic acid and 0.70g of chitosan, ultrasonicated for 4 hours, and the upper suspension was taken to obtain a graphite phase carbon nitride suspension;

[0057] (3) Preparation of graphene oxide dispersion: put 0.5 g of graphene oxide (GO) into 500 mL of deionized water for 10 hours of ultrasonic dispersion, take the upper dispersion liquid, and obtain a 1 g / L graphene oxide dispersion liquid;

[0058] (4) Layer-by-layer self-assembly: Soak the pretreated PMMA microspheres in graphite-phase carbon nitri...

Embodiment 2

[0061] (1) Pretreatment of polymethyl methacrylate (PMMA) microspheres: Soak polymethyl methacrylate microspheres in isopropanol for 80 seconds, and then centrifuge at 6000 rpm for 15 minutes to obtain a precipitate. Processed PMMA microspheres, standby;

[0062] (2) Preparation of graphite phase carbon nitride suspension: 5g graphite phase carbon nitride (g-C 3 N 4 ) into 300mL of isopropanol, ultrasonicated for 3 hours to obtain a suspension, then sequentially added 2.4 g of acetic acid and 0.50 g of chitosan, ultrasonicated for 7 hours, and the upper suspension was taken to obtain a graphite phase carbon nitride suspension;

[0063] (3) Preparation of graphene oxide dispersion: put 0.25g graphene oxide (GO) into 500mL deionized water for 8 hours and ultrasonically disperse, take the upper dispersion to obtain 0.5 g / L graphene oxide dispersion;

[0064] (4) Layer-by-layer self-assembly: Soak the pretreated PMMA microspheres in graphite-phase carbon nitride suspension, soni...

Embodiment 3

[0067] (1) Pretreatment of polymethyl methacrylate (PMMA) microspheres: Soak the polymethyl methacrylate microspheres in isopropanol for 120 seconds, and then centrifuge them at 9000 rpm for 10 minutes to obtain a precipitate. Processed PMMA microspheres, standby;

[0068] (2) Preparation of graphite phase carbon nitride suspension: 5g graphite phase carbon nitride (g-C 3 N 4 ) into 300mL of isopropanol, ultrasonicated for 7 hours to obtain a suspension, then sequentially added 7.0 g of acetic acid and 1.25 g of chitosan, ultrasonicated for 3 hours, and the upper suspension was taken to obtain a graphite phase carbon nitride suspension;

[0069] (3) Preparation of graphene oxide dispersion: put 1 g of graphene oxide (GO) into 500 mL of deionized water for ultrasonic dispersion for 12 hours, take the upper dispersion to obtain a 2 g / L graphene oxide dispersion;

[0070] (4) Layer-by-layer self-assembly: Soak the pretreated PMMA microspheres in the graphite-phase carbon nitrid...

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Abstract

The invention discloses flame-retardant modified PMMA (polymethylmethacrylate) microspheres and a preparation method thereof. The flame-retardant modified PMMA microspheres are of a nanometer core-shell structure, an inner core is PMMA microspheres, and an outer shell is an electrolyte layer formed by alternately depositing of different two-dimensional nanosheet layers. The preparation method comprises the steps as follows: soaking the PMMA microspheres pretreated by isopropanol in a graphite phase carbon nitride suspension liquid and a graphene oxide dispersion liquid sequentially for layer-by-layer self-assembly to obtain the flame-retardant modified methyl methacrylate microspheres. According to the flame-retardant modified PMMA microspheres, the hindering effect on oxygen and volatile gas transfer and the barrier effect on heat flow are realized mainly based on the physical barrier function of the two-dimensional nanometer sheet layers, and accordingly, excellent flame retardant performance and self-extinguishing performance are obtained. The preparation method is simple and flexible to operate, good in stability, lower in cost, low in operation condition requirement, and beneficial to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of flame-retardant modified materials, in particular to a flame-retardant modified polymethyl methacrylate microsphere and a preparation method thereof. Background technique [0002] Polymethyl methacrylate (PMMA) is a typical thermoplastic polymer capable of large-scale production. Due to its many excellent properties, such as good comprehensive mechanical properties and excellent light transmission, it is widely used in Building construction, optical fiber manufacturing, sanitary ware, various lamps, etc., have become an indispensable material in modern society. However, like the majority of thermoplastic polymer materials, it is extremely flammable, and has a large heat release rate, high calorific value, fast flame propagation speed, and is not easy to extinguish. Sometimes it also produces dense smoke and toxic gases, causing environmental damage. Harm, which greatly limits its applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C08J7/06C08L33/12
CPCC08J7/0423C08J7/065C08J2333/12
Inventor 江赛华谢波
Owner SOUTH CHINA UNIV OF TECH
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