Stress-responsive polymethyl-methacrylate-modified silicon-boron polymer microgel and preparation method thereof

The technology of polymethyl methacrylate and methyl methacrylate is applied in the field of stress-responsive polymethyl methacrylate-modified silicon boron polymer microgel and its preparation, and can solve the difficulty of forming complex structures, the impact of shock The problems of low strength and complex synthesis route can achieve the effect of excellent energy absorption efficiency, improved performance of absorbing impact energy, and low reaction temperature

Active Publication Date: 2017-03-15
SHENZHEN ACAD OF AEROSPACE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these above-mentioned disclosures mainly use polysiloxane impact-resistant materials as elastomers instead of gels. Although elastomers have certain impact resistance, their impact strength is not high and not soft, and the molding of complex structures Very difficult
In addition, the previous synthetic route is relatively complex and requires high temperature, but the present invention solves this problem and proposes a low-temperature polymerization, industrially simple synthetic route

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A microgel of polymethyl methacrylate modified silicon boron polymer is prepared by the following steps:

[0065] The molecular weight accounting for 75wt% of the prepolymerization reaction liquid weight is 3500, and the viscosity is 1500mpa at 25°C. s polydimethylsiloxane and cyclohexylethylene borate accounting for 25wt% of the weight of the prepolymerization reaction solution were mixed to form a prepolymerization reaction solution, stirred and reacted at 110°C for 8 hours, and then added to the reaction solution The difunctional group chain extender hexamethyl diisosine ester corresponding to 5% of the mass of the prepolymerization reaction solution continued to stir and react for 6 hours, and the reaction temperature was 60° C. Add γ-methacryloxypropyl trimethoxysilane as a neutralizing agent, stir and react at 70°C for 1 hour, and finally add methyl methacrylate containing ammonium persulfate equivalent to 30% of the mass of the prepolymerization reaction liquid ...

Embodiment 2

[0068] The molecular weight accounting for 75wt% of the prepolymerization reaction liquid weight is 900, and the viscosity is 500mpa at 25°C. s polydimethylsiloxane and triisopropyl borate accounting for 25wt% of the weight of the prepolymerization reaction solution were mixed to form a prepolymerization reaction solution, stirred and reacted at 110°C for 8 hours, and then the equivalent of prepolymerization was added to the reaction solution The difunctional chain extender isophorone diisosine ester of 5% of the mass of the reaction solution was stirred and reacted for 6 hours, and the reaction temperature was 60°C, and then 5% of the mass of the prepolymerized reaction solution was added as a surface modifier γ -Methacryloxypropyltrimethoxysilane, stirred and reacted at 70°C for 1 hour, and finally added ammonium persulfate-containing isopropyl methacrylate equivalent to 15% of the mass of the prepolymerization reaction liquid Alcohol solution, stirred and reacted at 80°C fo...

Embodiment 3

[0071] Polydimethylsiloxane with a molecular weight of 2000 and a viscosity of 1000mpa.s at 25°C, which accounts for 75wt% of the weight of the prepolymerization reaction solution, and cyclohexylethyleneboronic acid, which accounts for 15wt% of the weight of the prepolymerization reaction solution Mix the esters into a pre-polymerization reaction solution, stir and react at 80°C for 8 hours, and then add a bifunctional chain extender hexamethyldiisomate equivalent to 15% of the mass of the pre-polymerization reaction solution in the reaction solution to continue the stirring reaction for 6 hours, the reaction temperature is 60°C, then add the surface modifier gamma-methacryloxypropyltrimethoxysilane equivalent to 3% of the mass of the prepolymerization reaction liquid, and stir and react for 1 hour at 70°C, Finally, add the isopropanol solution of methyl methacrylate containing ammonium persulfate, the methyl methacrylate containing ammonium persulfate accounts for 5% of the pr...

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Abstract

The invention provides stress-responsive polymethyl-methacrylate-modified silicon-boron polymer microgel and a preparation method thereof; the modified silicon-boron polymer microgel is prepared by stirring and reacting pre-polymerization liquid at 80-130 DEG C for 6-8 hours, adding a bifunctional chain extender, continuously stirring and reacting for 6-8 hours at 60-90 DEG C, adding a surfactant, stirring and reacting at 80 DEG C for 1-2 hours, introducing polymethyl methacrylate monomer solution containing a catalyst, reacting at 60-80 DEG C for 4-6 hours, and drying the solvent; the pre-polymerization liquid comprises, by weight, 75.0-95.0% of low-molecular-weight polydiorganosiloxane, and 5.0-25.0% of a boron-containing compound. The preparation method of the invention has low reaction temperature, is simple to perform and facilitates large-scale production, and the microgel prepared has good flexibility and good impact resistance.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a stress-responsive polymethyl methacrylate modified silicon-boron polymer microgel and a preparation method thereof. Background technique [0002] Boron-crosslinked polysiloxanes have unique dilatant properties that allow them to exhibit unique stress-response properties. DOWCORNING was the first to publicly discover the dilation properties of boron-crosslinked polysiloxane, and proposed that it could be used as an energy-absorbing material and successfully applied to protective fabric systems. In addition, other research institutions have disclosed dilatant silicone compositions, sometimes referred to as "elastic putties". However, these above-mentioned disclosures mainly use polysiloxane impact-resistant materials as elastomers instead of gels. Although elastomers have certain impact resistance, their impact strength is not high and not soft, and the mol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/12C08F220/14C08G77/398C08G77/388
CPCC08F283/12C08G77/388C08G77/398C08F220/14
Inventor 晏义伍曹海琳翁履谦李常胜范震
Owner SHENZHEN ACAD OF AEROSPACE TECH
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