4 results about "Methyl isocyanate" patented technology

The application discloses a kind of methyl isocyanate production water washing system, including water washing tank and solvent recovery tank, recovery solvent pump is equipped on feed pipe, water washing tank bottom is connected with solvent recovery tank by bottom reflux pipe, mixed liquid tank is connected with feed pipe near water washing tank, overflow pipe one end in the upper side of water washing tank is connected with tail gas acid tower, and deionized water delivery pipe is connected with the lower side of water washing tank one side.Use, the trichloromethane discharged from the bottom of layered tank enters solvent recovery tank, and by the back and forth switching of control valve on deionized water delivery pipe, overflow valve and control valve on feed pipe, and cooperate with the judgment of liquid level in solvent recovery tank, recovery solvent pump is started, and trichloromethane in solvent recovery tank is sent into water washing tank to be washed by water;Trichloromethane after washing finally goes mixed liquid tank, HCl is sent to tail gas acid tower by overflow pipe, and then trichloromethane and HCl can be separated and recovered separately, the purity of trichloromethane can be improved, and it is conducive to the preparation of methyl isocyanate.

The invention relates to toothpaste essence based on a microcapsule technology and a preparation method of the toothpaste essence. According to the essence, modified essence molecules are wrapped by a microcapsule technology, so that slow and controllable release of the essence is realized. Modified essence molecules are esterified with acetic acid, react with methyl isocyanate to introduce amino groups, react with ethanol to introduce carboxyl groups, and react with ethylamine to introduce aldehyde groups, so that the stability, durability and controlled release performance of the essence molecules are enhanced. Through a microcapsule wrapping technology, the essence can be kept for a long time, and rapid volatilization of the essence is avoided. According to the technology, the essence can be released for a longer time in the toothpaste essence, the stability and the oxidation resistance of the essence are improved, and the use experience of a user is remarkably improved.

A resin includes a cured product of a polymerizable composition including a compound represented by the following general formula (1) and a thiol compound having one or more mercapto groups, and a biomass degree of the resin is 15% or more. In the general formula (1), each of R1 and R2 independently represent a hydrogen atom or a methyl group, and n represents an integer of 0 or 1.

The application discloses a preparation method of terbucarb, which comprises the following steps: taking 2-methylamino-5-tert-butyl-1,3,4-thiadiazole hydrochloride as raw material, reacting with methyl isocyanate in water under the action of a phase transfer catalyst, adjusting the reaction solution to be neutral after the reaction is completed and the temperature is increased to 50-60 DEG C, cooling and crystallizing, filtering, washing and drying the filter cake, and obtaining terbucarb products. The preparation method has the advantages of high yield, less waste, low cost, simple operation and the like.