Silicone rubber reinforced and cross-linked based on POSS, and preparation method thereof
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A silicone rubber and reinforcement technology, which is applied in the field of POSS crosslinked and reinforced silicone rubber and its preparation, can solve problems such as weak force, and achieve the effect of strong practicability, simple and efficient synthesis method, and easy promotion
Active Publication Date: 2018-02-23
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology
The invention avoids the problems of easy agglomeration of inorganic particles and weak interface force between organic / inorganic phases in the traditional reinforcement process, avoids the problems caused by the use of catalysts in the vulcanization process, and simplifies the preparation process of silicone rubber, production process and The product itself is safe, energy-saving and environmentally friendly, practical and easy to promote
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Embodiment 1
[0055] Base glue α,ω-aminopropyl polydimethylsiloxane (viscosity about 30000mPa.s) 100g, cyclocarbonate modified POSS 3g, mix well at room temperature (20℃~25℃), place in the mold , 60 ℃ vulcanization 6h to get silicone rubber;
[0056] Wherein, the structural formula of cyclocarbonate modified POSS is:
[0057]
[0058] where n=6,
[0059] Preferably, the R 3 The structural formula is:
[0060]
[0061] Among them, R 4 for -CH 2 -CH 2 -CH 2 -.
[0062] According to the national standard GB / T531.1-2008, GB / T528-2009, GB / T529-2008 respectively measure the hardness, tensile strength and elongation at break of the vulcanized silicone rubber.
[0063] The hardness is 40Shore A, the tensile strength is 5.6MPa, the elongation at break is 467%, and the tear strength is 13.6kN / m.
Embodiment 2
[0065] Repeat the steps described in Example 1, except that the viscosity of the base glue α, ω-aminopropyl polydimethylsiloxane is 5000 mPa.s.
[0066] The hardness is 45Shore A, the tensile strength is 4.5MPa, the elongation at break is 412%, and the tear strength is 12.3kN / m.
Embodiment 3
[0068] Repeat the steps described in Example 1, except that the base glue α, ω-aminopropyl polydimethylsiloxane has a viscosity of 50000 mPa.s.
[0069] The hardness is 38Shore A, the tensile strength is 7.1MPa, the elongation at break is 532%, and the tear strength is 15.0kN / m.
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Abstract
The present invention relates to a silicone rubber reinforced and cross-linked based on POSS, and a preparation method thereof. According to the concrete preparation method, cyclic carbonate containing vinyl and octa polyhedral oligomeric(mercaptopropyl) silsesquioxane (SH-POSS) are subjected to a thiol-ene reaction to synthesize cyclic carbonate modified POSS as a reinforcing filler, alpha,omega-aminoalkylpolysiloxane is used as a base glue, and the cyclic carbonate group on the POSS and the amino group in the base glue are subjected to a reaction to form a cross-linked curing center so as toprepare the room temperature or high temperature silicon sulfide rubber. According to the present invention, the problems that the inorganic particles are easy to agglomerate and the interaction force at the organic / inorganic two-phase interface is weak during the traditional reinforcing can be avoided, the problems caused by the use of the catalyst during the vulcanization can be avoided, the silicone rubber preparation process is simplified, and the production process and the product have characteristics of safety, energy saving, environmental protection, strong practicality and easy promotion, and have great application potential in the fields of aerospace, electrical and electronic, light industry, chemical industry, textile, machinery, building, transportation, national defense, energy sources, medicine and medical treatment, agriculture and the like.
Description
technical field [0001] The invention belongs to the technical field of organosilicon polymers, in particular to a POSS crosslinked and reinforced silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is one of the most important silicone products. Due to the unique structure of silicone polymers, silicone rubber has some unique properties different from organic rubber, such as high and low temperature resistance, weather resistance, ozone resistance and electrical insulation, etc. It has huge application potential in fields such as engineering, chemical industry, textile, machinery, construction, transportation, national defense, energy, medicine and medicine, and agriculture. [0003] Due to the weak molecular force between the main chains, the preparation of silicone rubber must be reinforced and vulcanized. Commonly used reinforcing fillers are generally inorganic fillers, such as nano-silica, short fibers, carbon nanotubes or n...
Claims
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