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Low-viscosity high-strength toughened silicon resin composition and preparation method thereof

A silicone resin composition and high-strength technology, applied in the field of silicone polymers, can solve the problem of difficulty in toughening effect due to co-hydrolysis of functional monomers, and achieve the advantages of improving resin strength, excellent comprehensive performance, and improving reinforcement effect. Effect

Active Publication Date: 2021-01-29
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As previously analyzed, co-hydrolysis of monomers with multiple functionalities is difficult to achieve the desired toughening effect, so it is conceivable that it is difficult to withstand severe thermal shocks, and the preparation methods of CN105218825 and CN101070386 all adopt a water washing process, resulting in a large amount of waste water
[0005] At present, there is no low viscosity (≤1000mPa s), high strength (bending strength ≥50N / mm 2 , Tensile strength ≥ 20MPa) and can withstand 300 times 0-220 ℃ cold and heat impact toughened silicone resin

Method used

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  • Low-viscosity high-strength toughened silicon resin composition and preparation method thereof
  • Low-viscosity high-strength toughened silicon resin composition and preparation method thereof
  • Low-viscosity high-strength toughened silicon resin composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 172.8 g of deionized water, 400 g of toluene, and 10 g of acetic acid into a four-necked flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and add 1,057 g of phenyltrimethoxysilane dropwise. After the addition, the temperature was raised to reflux, reacted for 2h, and then cooled to room temperature. The low boilers were distilled off at a pressure of less than 10KPa at 80°C to obtain 680g of a liquid trifunctional silicone resin prepolymer.

[0034] Add 270 g of deionized water, 0.38 g of trifluoromethanesulfonic acid, and 500 g of toluene into a four-necked flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and dropwise add 900 g of methylphenyldimethoxysilane, A mixed solution consisting of 261 g of methylvinyldimethoxysilane and 262 g of methylvinyldimethoxysilane. After the addition, the reaction was refluxed for 2 hours, cooled to room temperature, and the layers were separated, ...

Embodiment 2

[0037] Add 172.8 g of deionized water, 400 g of toluene, and 10 g of acetic acid into a four-neck flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and add 952 g of phenyltrimethoxysilane dropwise. After the addition, the temperature was raised to reflux, reacted for 2h, and then cooled to room temperature. The low boilers were distilled off at a pressure of less than 10 KPa at 80° C. to obtain 610 g of a liquid trifunctional silicone resin prepolymer.

[0038] Add 402 g of deionized water, 0.5 g of trifluoromethanesulfonic acid, and 600 g of toluene into a four-necked flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and dropwise add 900 g of methylphenyldimethoxysilane, A mixed solution consisting of 371 g of methylvinyldimethoxysilane and 366 g of methylvinyldimethoxysilane. After the addition, the reaction was refluxed for 2 hours, cooled to room temperature, and the layers were separated, a...

Embodiment 3

[0041] Add 144 g of deionized water, 300 g of toluene, and 8 g of acetic acid into a four-necked flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and add 793 g of phenyltrimethoxysilane dropwise. After the addition, the temperature was raised to reflux, reacted for 2h, and then cooled to room temperature. The low boilers were distilled off at a pressure of less than 10KPa at 80°C to obtain 510g of a liquid trifunctional silicone resin prepolymer.

[0042] Add 355 g of deionized water, 0.4 g of trifluoromethanesulfonic acid, and 500 g of toluene into a four-necked flask equipped with a thermometer, a stirring paddle, and a reflux condenser, stir evenly, and dropwise add 900 g of methylphenyldimethoxysilane, A mixed solution consisting of 293 g of methylvinyldimethoxysilane and 288 g of methylvinyldimethoxysilane. After the addition, the reaction was refluxed for 2 hours, cooled to room temperature, and the layers were separated, and th...

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Abstract

The invention discloses a low-viscosity high-strength toughened silicon resin composition and a preparation method thereof. According to the invention, a trifunctional siloxane monomer and a difunctional siloxane monomer are subjected to hydrolytic polycondensation separately to prepare a high-crosslinking-density body type reinforcing structure and a linear toughening structure with certain molecular weights respectively; and further copolycondensation with a monofunctional end-capping reagent is performed to prepare the low-viscosity silicon resin (R1SiO1.5) a (R2R3SiO) b (R43SiO0.5) c withthe T-shaped body polysiloxane-D-type linear polysiloxane-M-type end-capped siloxane block structure. A silicon vinyl group and a silicon hydrogen group are introduced into the resin linear structure,and are uniformly mixed with a silicon resin coated platinum complex, an alkynyl or polyvinyl inhibitor and a tackifier to obtain the low-viscosity high-strength toughened silicon resin composition.The composition has enough strength and toughness after being cured on the premise of low viscosity, and can resist cold and hot impact of 0-220 DEG C.

Description

technical field [0001] The invention relates to a low-viscosity, high-strength, toughened silicone resin composition and a preparation method thereof, belonging to the technical field of silicone polymers. Background technique [0002] Silicone resin is a thermosetting polysiloxane material with a highly cross-linked structure. It has excellent high temperature resistance (200-250 °C can be used for a long time), outstanding dielectric properties, excellent corona resistance, arc resistance, Low dielectric loss tangent, radiation resistance and flame retardant, especially the unique waterproof and moisture resistance, the insulation performance remains basically unchanged in water or humid environments, and is the first choice for impregnated insulation materials for electronic coils and motors. [0003] In order to improve the integrity of the insulation system and obtain an air-gap-free insulation system, the vacuum pressure impregnation (VPI) process is mostly used for la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/44C08G77/06
CPCC08G77/44C08G77/06
Inventor 彭丹牟秋红李金辉王峰
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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