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A kind of nanoparticle type in situ initiator and its preparation method and application

A nanoparticle and initiator technology, applied in the field of nanoparticle type in-situ initiator and its preparation, can solve the problems of high gel rate, insufficient modification effect, and difficulty in uniform dispersion of nanoparticles, so as to improve water resistance and Mechanical strength, the effect of reducing the gelation rate

Active Publication Date: 2022-04-19
HANGZHOU TRANSFAR FINE CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the nano-silica particles are directly added to the acrylate emulsion, the nanoparticles will be difficult to disperse evenly, and even phase separation will occur, making it difficult to work.
[0003] The preparation of silica-acrylate hybrid emulsion by in-situ miniemulsion polymerization is a polymerization technology developed in recent years, which can realize the coating of polyacrylate on nano-silica particles, and improve the dispersion effect and utilization rate; It is also possible to modify the nanoparticles with a silane coupling agent containing double bonds first to obtain nanoparticles with polymerization activity, and then carry out in-situ miniemulsion polymerization with acrylate, which can improve the interaction force between nanoparticles and polyacrylate and compatibility, but there are often disadvantages such as high gel rate and insufficient modification effect in this system

Method used

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  • A kind of nanoparticle type in situ initiator and its preparation method and application
  • A kind of nanoparticle type in situ initiator and its preparation method and application
  • A kind of nanoparticle type in situ initiator and its preparation method and application

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Effect test

Embodiment 1

[0020] Under nitrogen protection, 400g of ethanol was added to the reaction vessel, the stirring was started, the temperature was controlled at 15°C, 40g of sodium bisulfite aqueous solution (mass concentration was 25%) was added, and then 20g of γ-isocyanatopropyl triethoxy Silane, reacted for 30 minutes; be warming up to 40 ℃, add 5g ammoniacal liquor (mass concentration is 25%), then add 20g nano-silicon dioxide (particle diameter is 50 nanometers) and react for 3 hours, centrifuge then and wash three times with ethanol, dry to obtain obtained The nanoparticle type in situ initiator described above.

Embodiment 2

[0022] Under nitrogen protection, 300g of ethanol was added to the reaction vessel, the stirring was started, the temperature was controlled to be 25°C, 40g of sodium bisulfite aqueous solution (mass concentration was 25%) was added, and then 20g of γ-isocyanatopropyltriethoxy Silane, reacted for 35 minutes; be warming up to 50 ℃, add 3g ammoniacal liquor (mass concentration is 25%), then add 10g nano-silicon dioxide (particle diameter is 50 nanometers) and react for 4 hours, then centrifuge and rinse with ethanol three times, dry to obtain the The nanoparticle type in situ initiator described above.

Embodiment 3

[0024] Under nitrogen protection, 200g of ethanol was added to the reaction vessel, the stirring was started, the temperature was controlled at 25°C, 30g of sodium bisulfite aqueous solution (mass concentration was 25%) was added, and then 15g of γ-isocyanatopropyltriethoxy Silane was reacted for 30 minutes; the temperature was raised to 50°C, 2g of ammonia (mass concentration was 25%) was added, and 10g of nano silicon dioxide (particle diameter was 20 nanometers) was added for reaction for 2 hours, then centrifuged and washed three times with ethanol, and dried to obtain the The nanoparticle type in situ initiator described above.

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Abstract

The invention discloses a nano particle type in-situ initiator, a preparation method and application thereof. The preparation method of the present invention comprises: first reacting γ-isocyanatopropyl triethoxysilane and sodium bisulfite for 30 to 35 minutes, using ethanol as a solvent and hydrolysis inhibitor, then adding ammonia and nano silicon dioxide to react after heating up. ~4 hours, then centrifuged and rinsed with ethanol, dried to obtain the nanoparticle-based in situ initiator. In the present invention, through the chemical modification of nano-silica particles, the surface has initiator activity. During the in-situ miniemulsion polymerization process, the nano-particle initiator can initiate acrylate polymerization, so that the acrylate polymer is directly grafted on the particles. Surface, thereby reducing the gel rate, improving the water resistance and mechanical strength of the resin.

Description

technical field [0001] The invention relates to a chemical initiator, in particular to a nano particle type in-situ initiator and its preparation method and application. Background technique [0002] Water-based polyacrylate has excellent film-forming properties, adhesion, transparency, light resistance and weather resistance, and is widely used in leather, coatings, adhesives and other fields. Introducing nano-silica particles into polyacrylate to prepare organic-inorganic hybrid materials can effectively improve the water resistance and mechanical properties of polyacrylate. However, if the nano-silica particles are directly added to the acrylate emulsion, the nanoparticles will be difficult to disperse evenly, and even phase separation will occur, making it difficult to work. [0003] The preparation of silica-acrylate hybrid emulsion by in-situ miniemulsion polymerization is a polymerization technology developed in recent years, which can realize the coating of polyacry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F292/00C08F220/14C08F220/18
CPCC08F292/00C08F220/14
Inventor 敬小波包界杰张丹丹王胜鹏赵婷王小君洪京
Owner HANGZHOU TRANSFAR FINE CHEM CO LTD
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