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Modified sulfydryl-containing liquid silicone resin, non-toxic, colorless and odorless light-cured liquid silicone rubber and preparation method and application thereof

A liquid silicon and light-curing technology, which is applied in the field of non-toxic and tasteless light-curing silicone materials, can solve the problems of bad smell and high toxicity, and achieve the effects of moderate viscosity, fast curing speed and high application value

Active Publication Date: 2021-11-12
SHENZHEN INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These small molecular substances are easy to escape before the liquid silicone rubber is cured, especially the introduction of small molecular crosslinking agents containing mercapto and acrylate double bonds will cause the product to have an unpleasant smell and high toxicity before curing, so the above products Generally used in 3D printing, not suitable for medical industry and human body

Method used

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  • Modified sulfydryl-containing liquid silicone resin, non-toxic, colorless and odorless light-cured liquid silicone rubber and preparation method and application thereof
  • Modified sulfydryl-containing liquid silicone resin, non-toxic, colorless and odorless light-cured liquid silicone rubber and preparation method and application thereof

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preparation example Construction

[0046] In some specific technical solutions of the present invention, a kind of preparation method of photocuring liquid silicone rubber prepolymer liquid is provided, and it comprises following preparation method:

[0047] S1-1) Preparation of vinyl-modified silica

[0048]

[0049] The preparation of vinyl-modified silica is shown in formula (1).

[0050] Take white carbon black and dissolve it in a container with a solvent. After ultrasonic dispersion, add a composition of vinyl dimethyl chlorosilane and trimethyl chlorosilane under heating conditions. After the reaction is complete, dry under reduced pressure to obtain a surface covered with vinyl Modified silica powder.

[0051] Wherein, the solvent is one or more mixtures of n-hexane, cyclohexane, ethyl acetate, butyl acetate, and toluene; preferably, the solvent is n-hexane and ethyl acetate, and the mixing volume ratio is 1:1 .

[0052] Preferably, the silica is one or a mixture of fumed silica, precipitated sili...

Embodiment 1

[0075] A modified mercapto-containing liquid silicone resin and the corresponding non-toxic, colorless, and odorless light-cured liquid silicone rubber are respectively prepared by the following methods:

[0076] S1) Preparation of modified liquid silicone resin containing mercapto groups

[0077] S1-1) Preparation of vinyl-modified silica

[0078] Take 5.0g of fumed silica, 0.4g of trimethylchlorosilane and 0.1g of vinyl dimethylchlorosilane and add it to a 1:1 mixed solvent of 50g of n-hexane and ethyl acetate, ultrasonically disperse it for 10min, and at 40 °C for 4 hours, and vacuum-dried to obtain modified white carbon black powder.

[0079] S1-2) Preparation of modified mercapto-containing liquid silicone resin

[0080] Take 8g mercaptopropyltrimethoxysilane, 2g mercaptopropylmethyldimethoxysilane, 8g dimethyldimethoxysilane, 2g trimethoxysilane, 4.0g ultrapure water, 20g hexamethyldisilazane Ether (MM), 0.1 g of concentrated hydrochloric acid were stirred and reacted...

Embodiment 2

[0085] A modified mercapto-containing liquid silicone resin and the corresponding non-toxic, colorless, and odorless light-cured liquid silicone rubber are respectively prepared by the following methods:

[0086] S1) Preparation of modified mercapto-containing liquid silicone resin

[0087]S1-1) Preparation of vinyl-modified silica

[0088] Take 5.0g of fumed silica, 0.4g of trimethylchlorosilane and 0.1g of vinyl dimethylchlorosilane, and add it to a 1:1 mixed solvent of 50g of n-hexane and ethyl acetate, and ultrasonically disperse it for 10min. °C for 3 hours, and vacuum-dried to obtain modified white carbon black powder.

[0089] S1-2) Preparation of modified mercapto-containing liquid silicone resin

[0090] Take 6.0g mercaptopropyltrimethoxysilane, 4.0g mercaptopropylmethyldimethoxysilane, 5.0g dimethyldimethoxysilane, 5.0g trimethoxysilane, 5.0g ultrapure water, 30g six Methyldisiloxane (MM), 0.05g of concentrated hydrochloric acid was stirred and reacted at 40°C, an...

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Abstract

The invention discloses a preparation method and application of modified sulfydryl-containing liquid silicone resin and non-toxic, colorless and odorless light-cured liquid silicone rubber. The modified sulfydryl-containing liquid silicon resin is prepared by the following steps: S1-1) preparing vinyl modified white carbon black; S1-2) preparing modified sulfydryl-containing liquid silicon resin: stirring and reacting a mercaptopropyl silane coupling agent, dimethyl dialkoxy silane, trialkoxy silane, an end-capping reagent, a solvent and an acid catalyst under a heating condition to obtain the sulfydryl-containing liquid silicon resin; and reacting a photoinitiator, the vinyl modified white carbon black prepared in the step S1) and an acid catalyst to obtain the modified sulfydryl-containing liquid silicon resin. The initiator, the filler, the cross-linking agent and other components are in bond connection with the self-made-SH liquid silicon resin through chemical reaction, the problems that traditional light-cured silicon rubber has unpleasant smell before curing, small molecule components are prone to escaping and the like are fundamentally solved, and the light-cured silicon rubber can be applied to medical light-cured materials.

Description

technical field [0001] The invention relates to the field of non-toxic and tasteless light-curing silicone materials, in particular to a preparation method and application of a modified mercapto-containing (-SH) liquid silicone resin and non-toxic, colorless and tasteless extremely fast light-curing liquid silicone rubber. Background technique [0002] Organosilicon materials not only have excellent water resistance, high and low temperature resistance, aging resistance, and good insulation, but also have good biocompatibility and air permeability, and are non-toxic and harmless. Therefore, organosilicon materials have been widely used in medical, In the medical beauty industry. [0003] Common photocurable silicone materials are classified according to the photosensitive active functional groups used, and can be roughly divided into silicon hydrogen (-SiH) and vinyl (-CH=CH 2 ) type, acryloyloxy (CH 2 =CHCOO-) type, and -SH and -CH=CH 2 type etc. Among them, containing ...

Claims

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Application Information

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IPC IPC(8): C08G77/38C08L83/08C08L83/07
CPCC08G77/38C08L83/08C08L83/04C08L2205/035C08L2205/025
Inventor 何睿喻学锋康翼鸿余学成陈曦张光武
Owner SHENZHEN INST OF ADVANCED TECH
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