48 results about "Aminopropionitrile" patented technology

The invention discloses a method for preparing an outdoor weather-resistant advertising car sticker, which comprises a base material layer, an adhesive layer and a release layer, one side of the base material layer is coated on the adhesive layer, and the adhesive layer The side opposite to the substrate layer is provided with a release layer, and the adhesive layer is obtained by coating and drying the glue solution. The glue solution is obtained by the following steps: S1, adding 15 to 25 parts of methyl methacrylate, Mix 15~25 parts of styrene, 15~20 parts of 2-ethylhexyl acrylate, 1~1.5 parts of trimethylpentanediol, 1~5 parts of dimethylaminopropionitrile and 50~75 parts of deionized water , heat up to 75~80°C, add dropwise 0.5~1.5 parts of azoisobutylcyanoformamide and 1~10 parts of acrylic acid to the mixed system, and react for 3~4 hours; S2, cool to room temperature, add bis peroxide 2 , 1-5 parts of 4-dichlorobenzoyl, 1-1.5 parts of curing agent, 0.2-1 part of emulsifier and 0.1-1 part of hydroquinone, mix evenly to obtain glue; S3, evenly coat the glue On the substrate layer, dry to obtain the adhesive layer. The invention improves the waterproof performance, the adhesive force is basically unchanged, and the bonding is stable.

The invention provides a method for preparing pentamethyldipropylene triamine. The method comprises the following steps: (1) 3-dimethylaminopropylamine and acrylonitrile are reacted to generate 3-[[3-(dimethylamino)propyl]amino]propionitrile reaction solution, and 3-[[3 -(dimethylamino)propyl]amino]propionitrile pure product; (2) adding 3-[[3-(dimethylamino)propyl]amino]propionitrile to hydrogen and solvent under the action of a catalyst; Hydrogen reaction obtains N'-(3-aminopropyl)-N,N-dimethyl-1,3-propanediamine reaction solution; (3) N'-(3-aminopropyl) obtained in step (2) base)-N,N-dimethyl-1,3-propylenediamine reaction solution and formaldehyde and hydrogen undergo methylation reaction under the action of a catalyst to obtain pentamethyldipropylenetriamine. The method has the advantages of cheap and easy-to-obtain starting materials, good product selectivity, high product yield, economical and effective method, and industrialization prospect.

The invention relates to a method for preparing dimethylamino propylamine through hydrogenating dimethylamino propionitrile in the presence of nickel. The method comprises the following step: under the reaction condition thatdimethylamino propionitrile is hydrogenated to prepare dimethylamino propylamine in the presence of a catalyst, contacting dimethylamino propionitrile with hydrogen for reaction, wherein the catalyst contains at least one amorphous Ni-Al-Mo-M catalyst; by taking the weight of the catalyst as a reference, the weight ratio of Ni to Al to Mo to M is (5-500):(1-150):(1-150):1; and M is selected from one or more of transition metals in IB group, IIB group, IIIB group, IVB group, VIIB group, VIB group except for Mo and VIII group except for Ni. Compared with the prior art, the invention has the advantage that the selectivity of the dimethylamino propylamine prepared through hydrogenation by dimethylamino propionitrile is obviously increased.

The invention discloses a process for preparing N-methyl-1,3-propylenediamine through continuous catalytic reaction in two fixed-bed reactors, which belongs to the technical field of organic chemical industry. Using monomethylamine and acrylonitrile as raw materials, first continuously pass through the first fixed-bed reactor to react to generate 3-methylaminopropionitrile intermediate, and then continuously enter the second fixed-bed hydrogenation reactor for catalytic hydrogenation Hydrogen to generate N-methyl-1, 3-propylenediamine, yield ≥ 99%. The process of the invention is continuous production, simple, less three wastes, energy saving, environmental protection, low cost, and easy to realize industrialization.

The weather-resistant advertisement sticker comprises a base material layer, a back adhesive layer and a release layer, one face of the base material layer is coated with the back adhesive layer, and the release layer is arranged on the face, opposite to the base material layer, of the back adhesive layer; the back adhesive layer is obtained by coating and drying an adhesive solution, and the adhesive solution is prepared from the following components in parts by weight: methyl methacrylate, styrene, 2-ethylhexyl acrylate, acrylic acid, bis (2, 4-dichlorobenzoyl) peroxide, azoisobutyronitrile, trimethylpentanediol, dimethylaminopropionitrile, a curing agent, deionized water, an emulsifier and hydroquinone. According to the weather-resistant advertisement sticker, the waterproof performance is improved, the adhesive force of the weather-resistant advertisement sticker is basically unchanged under the condition that the environment humidity is relatively high, and the weather-resistant advertisement sticker is stable in adhesion and does not fall off.

The invention belongs to the technical field of nitrile group hydrolysis and demethylation hydrolysis reaction which is one of the key steps for chemical synthesis of a methyldopa drug or a chiral drug of L-methyldopa [L-alpha-methyl-(3,4-dimethoxyphenyl)-alpha-aminopropionitrile, the same below], that is, a reaction for preparing alpha-methyl-(3,4-dimethoxyphenyl)-alpha-aminopropionitrile or L-alpha-methyl-(3,4-dimethoxyphenyl)-alpha-aminopropionitrile by nitrile group hydrolysis and demethylation hydrolysis. Under an acidic condition, the preparation of methyldopa by nitrile group hydrolysis and demethylation hydrolysis of alpha-methyl-(3,4-dimethoxyphenyl)-alpha-aminopropionitrile (or hydrochloride) requires a long period, a large material using amount, and heating hydrolysis of high-concentration acids (and the long-time heating of the high-concentration acids allows the acids to volatilize, so continuous acid addition is required during hydrolysis); however, the long-time high-concentration acid heating hydrolysis can cause unknown change of certain compound structures of alpha-methyl-(3,4-dimethoxyphenyl)-alpha-aminopropionitrile (or hydrochloride), and thus by-products are increased, and the purity and yield are decreased. Therefore, improvement of the hydrolysis technology is necessary.