Skin-friendly silica gel and preparation method thereof

A skin-friendly, silica gel technology, applied in the field of silica gel, can solve problems such as easy precipitation of small molecular substances, achieve excellent microstructure, improve service life, and eliminate internal stress

Inactive Publication Date: 2020-01-07
东莞新东方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a skin-friendly silica gel and its preparation method, aiming to solve the technical problem that the silica gel in the prior art is easy to precipitate small molecular substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] An embodiment of the present invention provides a skin-friendly silica gel, comprising the following raw materials: 100 parts by weight of raw rubber; 20 parts by weight of white carbon black; 30 parts by weight of silicone oil; 0.5 parts by weight of a crosslinking agent; 0.2 parts by weight release agent.

[0032] The vinyl content of the raw rubber is 0.03%; its molecular weight is 400,000. The volatile content of the raw rubber is less than 0.5%.

[0033] The viscosity of the silicone oil is 5000CS.

[0034] Described white carbon black is that specific surface area is 195m 2 / g of fumed silica.

[0035] The surface treatment rate of the white carbon black is 30%.

[0036] The embodiment of the present invention also provides a preparation method of the above-mentioned skin-friendly silica gel, comprising the following steps:

[0037] 1) Cold dispersing: add 100kg of raw rubber to the mixer, control the rubber temperature at 50°C, add 20kg of white carbon black...

Embodiment 2

[0041] An embodiment of the present invention provides a skin-friendly silica gel, comprising the following raw materials: 100 parts by weight of raw rubber; 40 parts by weight of white carbon black; 65 parts by weight of silicone oil; 3 parts by weight of a crosslinking agent; 0.35 parts by weight The release agent of 200 parts by weight of n-octanol.

[0042] The vinyl content of the raw rubber is 0.055%; its molecular weight is 450,000.

[0043] The volatile content of the raw rubber is less than 0.5%.

[0044] The viscosity of the silicone oil is 7500CS.

[0045] Described white carbon black is that specific surface area is 200m 2 / g of fumed silica.

[0046] The surface treatment rate of the white carbon black is 40%.

[0047] Also includes the following ingredients: .

[0048] The embodiment of the present invention also provides a preparation method of the above-mentioned skin-friendly silica gel, comprising the following steps:

[0049] 1) Weigh 40kg of white car...

Embodiment 3

[0056] An embodiment of the present invention provides a skin-friendly silica gel, comprising the following raw materials: 100 parts by weight of raw rubber; 60 parts by weight of white carbon black; 100 parts by weight of silicone oil; 6 parts by weight of a crosslinking agent; 0.5 parts by weight The release agent of 600 parts by weight of n-octanol.

[0057] The vinyl content of the raw rubber is 0.08%; its molecular weight is 500,000.

[0058] The volatile content of the raw rubber is less than 0.5%.

[0059] The viscosity of the silicone oil is 10000CS.

[0060] Described white carbon black is that specific surface area is 205m 2 / g of fumed silica.

[0061] The surface treatment rate of the white carbon black is 50%.

[0062] The embodiment of the present invention also provides a preparation method of the above-mentioned skin-friendly silica gel, comprising the following steps:

[0063] 1) Weigh 60kg of silica, place the silica in a muffle furnace, dry at 210°C for 1...

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Abstract

The invention belongs to the technical field of silica gel, and particularly relates to skin-friendly silica gel and a preparation method thereof. The skin-friendly silica gel comprises the followingraw materials in parts by weight: 100 parts of a raw gel; 20 to 60 parts of white carbon black; 30 to 100 parts of silicone oil; 0.5 to 6 parts of a cross-linking agent; and 0.2 to 0.5 part of a release agent. The preparation method of the skin-friendly silica gel comprises the following steps: 1) cold mixing and dispersing; 2) carrying out heat refining reaction; and 3) eliminating gel material stress. According to the preparation method of the skin-friendly silica gel, a low molecule removal procedure is added in the hot refining reaction process, the temperature of a cold refined product isincreased to 160-180 DEG C, the constant temperature is kept for 2-4 hours, and moisture in reactants is removed; vacuumizing is carried out, constant temperature treatment is carried out for 2-4 hours at a vacuum degree of -0.1 to 0.08 Mpa, and low molecules in reactants are removed; the mass content of low-molecular-weight substances after reaction is 0.01-0.5%, the content of the low-molecular-weight substances in the prepared skin-friendly silica gel is low, and the phenomenon that the low-molecular-weight substances is separated out is reduced.

Description

technical field [0001] The invention belongs to the technical field of silica gel, and in particular relates to a skin-friendly silica gel and a preparation method thereof. Background technique [0002] Silicone rubber has excellent physical stability and physiological inertia, and is odorless, non-toxic, environmentally friendly and healthy. In addition, silica gel has the closest texture and touch to human skin. Therefore, silica gel has been widely used in the manufacture of objects that come into contact with the human body, such as silicone bracelets, silicone insoles, and silicone earplugs. [0003] Silicone rubber in the prior art generally has the phenomenon of easy precipitation of small molecular substances, such as precipitation of frost or oil, resulting in poor touch of the silicone rubber. And in the process of product forming, there are phenomena such as long vulcanization time, mold sticking, air bubbles, easy to break, and short service life. Contents of ...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/04C08K9/04C08K7/26B29B7/00
CPCB29B7/005C08K2201/006C08L83/04C08L2205/025C08K9/04C08K7/26
Inventor 田玉文田再良
Owner 东莞新东方科技有限公司
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