Trimethylasulfane and metamine reaction: synthesis and application of silane pedals (with safety instructions)
Chemical nature of trimethyl chloroform and metamine reactions
1. 1 reactive characterization
Trimethyl-chlorosilane (tms, cas 75-52-5) is the core precursor of silican phenols, and the si-cl key contained in the molecular structure is highly nuclear. The compound can be replaced with amino compounds at constant temperatures, creating a web structure with si-o-si keys, which is a key step in the modification of organic silicon materials。
1. 2 categorization of reagents of ammonium
Methamphetamine (e. G., triethylamine), amphetamine (e. G., diethylamine) and althamphetamine (e. G., n, n-dimethylamine) are commonly used in the response. Of these, belamine, which has two free-amino radicals, can form a double-keyd structure, and amphetamine can produce a more stable ring transition state, which is often used as a catalyst。
Response mechanisms and dynamics studies
2. 1 molecular orbital theoretical perspective
According to molecular orbital theory, the tms sp3 commodified silica atoms and ammonium monotones form electrons, while silica 3d orbits colloquially with pmamines. The process follows the sn2 mechanism and the reaction rate constant k up to 1. 2 x 10^5 m^-1 s^-1 (at 25°c)。
2. 2 calculation of thermodynamic parameters
3. 1 response system construction
It is recommended to use a three-mouth flask device equipped with a magnetic mixing and condensation reflow system. Solvents select a mixture system of cyclohexane (boiling point 80°c) and toluene (boiling point 110°c) (age ratio 3:1), increasing the purity of the product to 98% thiram。
3. 2 catalysing systemic innovation
Experiments have shown that adding 5% of the kah/water system (mass compared to 1:4) increases the response rate 3. 2 times. The by-product trimethyloxysilane (tpos) was reduced to less than 0. 8% when the metamine and tms molby were controlled at 1. 2:1。
Iv. Typical areas of application and cases
4. 1 semiconductor sealed materials
In a 5g communication device, the binding strength of the chip could be increased from 25 mpa to 41 mpa (data source: reported by the central college semiconductor) using an a-187 silane agent prepared by tts and diethylamine reaction。
4. 2 organic silicon modification systems
V. Safe operation and disaster management
5. 1 hazardous chemical characteristics
The hcl gas (pc = 0. 17 ppm) released by the tms and the metamine reaction is irritating and requires a local venting system (12 times/h). Reaction vacuum pressure should be contained within 0. 3-0. 5 mpa to avoid thermal decomposition of silicans。
5. 2 waste liquid treatment programme
Using the neutral-sedition-filtration three-step approach: 30% naoh solution adjusts ph to 9-10, adding 5% peg-400 as a condensant, and ultimately sediments can be recovered as a silicon source after drying at 120°c。
Vi. Advances in front-line research ()
6. 1 green synthetic technology
Microwave auxiliary response device developed by the university of tsinghua team reduced the response time from 120 to 8min, reduced energy consumption by 65 per cent and by-products by 82 per cent (j. Hazard. Mater., 452: 226-234)。
6. 2 new functional materials
The latest development of the tms-pei (polyetheramine) complex in the japanese sino-turkish chemistry showed excellent investment in soft electronics (exposure angles)
Analysis of economic benefits
7. 1 cost accounting
Take, for example, the project to produce 200 tons of silane dosages per year:
- cost of raw materials: tms (150,000 yuan/t) + ammonium (80,000 yuan/t) = 230,000 yuan/t
- energy cost: $0. 35 million/ton
- total cost: 2335,000 yuan per ton (data)
7. 2 market prospects
According to grand view research, the annual compound growth in the size of the silicane puppets market in 2030 is 8. 7 per cent, with the share of electronic sealing increasing to 34 per cent (data)。
Trimethylasulfane and metamine reaction: synthesis and application of silane pedals (with safety instructions)
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