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Take you to know the common titanate coupling agent of calcium carbonate (CaCO3)

Oct 27th, 2022 at 08:11   Real estate   Saddiqabad   49 views

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Examples are as follows: TiCl4+-4C4H90HTi( OC4H9)4+4HC1↑ A 1000 ml four-necked flask was equipped with a sealed stirrer, a reflux condenser, and a dropping funnel. Add 4.8mol of n-butanol into the flask, place it in a water bath, and slowly add 0.3mol of TiCl 4 dropwise when the temperature in the flask does not exceed 80 ℃. After dropping, replace the dropping funnel with an ammonia inlet tube, and slowly introduce dry ammonia. When ammonia is introduced,titanium exhaust tubing, white smoke is produced in the reaction bottle, and the temperature in the bottle keeps rising. The reaction temperature is controlled not to exceed 100 deg C by adjusting the ammonia feeding speed. When the HC1 produced by the reaction is completely neutralized by ammonia, the introduction of ammonia is stopped. At this time, that wat bath was replaced with an oil bath, and the reaction was carry out at 110. degree. C. to 115. degree. C. for one hour. Then cooling to normal temperature, and carrying out suction filtration by using a dry filter in a moisture-free environment. Distilling the white NH4Cl4 filtrate under normal pressure after removing the filter cake, intercepting excessive n-butanol, distilling under reduced pressure, and collecting 172-3. /6 distillate, I. e., that product, is obtain in an amount of 80-85 G, with a yield of 80% for TiCI4. As an industrial production method, it is said that the ammonia method is preferred, and the production methods of other Titanic acid lower esters are not described in detail. 2. Preparation of titanium coupling agent : There is no formal report on the specific preparation method of titanium coupling agent at home and abroad. The author makes an inference only from the point of view of the given molecular structure. Isopropyl tri (acrylic acid) titanate of (I) alkoxy type It is the reaction between tetraisopropyl titanate and acrylic acid, and the end point of the reaction is determined by removing a certain amount of isopropanol. The reaction equation is: III. Functions and Types of Titanium Coupling Agents 1. Function It is well known that tetravalent carbon atoms form the basis of life. Chemists, inspired by the characteristics of tetravalent titanium,3d titanium wire, have ingeniously designed multi-functional titanates with the general formula: (R1O) mTi- (OX-R2-Y) n, in an attempt to act as molecular bridges linking inorganic fillers to organic polymers. Another problem is that the processing temperature of the system should be below the decomposition temperature of the titanate. If the processing temperature is higher than the decomposition temperature of the titanate, the titanate will fail due to decomposition. For example, the decomposition temperature of TTS is 210 ℃, while the processing temperature of polypropylene is 1 ~ 210 ℃, so the coupling agent can be decomposed prematurely. At this time, it is necessary to adopt the pretreatment method or fully knead below 210 ℃ until the reaction is complete, and then re-pelletize. After the reaction of the titanate and the filler, the decomposition point is obviously improved. For example,ti6al4v eli, the decomposition temperature of the combination of TTS and filler is 335 ℃, and the processing is not a problem in general. b. Pretreatment method : The advantage of the pretreatment is that the efficiency of the filler and the titanate coupling agent is high. The filler is changed from hydrophilic to hydrophobic and lipophilic through pretreatment. Prevent moisture invasion And that performance of the fill is kept stable. At present, several foreign companies have sold fillers pretreated by titanate. Return to Sohu to see more Responsible Editor:. yunchtitanium.com

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