79results about How to "Shorten the polymerization reaction time" patented technology

The present invention provides a preparation method of poly(carbonic ester-ether)polyol. The method comprises the steps of: reacting carboxylic acid with acidity constant of 0.2-4with epoxide to obtain an intermediate product; reacting the intermediate product with carbon dioxide for a polymerization reaction under the effect of Zn3[Co(CN)6]2 rare earth-doped double metal cyanide to obtain poly(carbonic ester-ether)polyol. The preparation method of poly(carbonic ester-ether)polyol provided by the present invention employs carboxylic acid with appropriate acidity constant as an initiator; carboxylic acid is used to activate the epoxide; and the activated in-situ generated polyethers with different molecular weight are used as a chain transfer agent for participating polymerization reaction of carbon dioxide and an epoxide under the effect of Zn3[Co(CN)6]2 rare earth-doped double metal cyanide. The preparation method of the poly(carbonic ester-ether)polyol the has short reaction time, and content of a byproduct propylene carbonate is low.

The invention provides a method for improving the molecular weight of a thermotropic liquid crystal polymer. According to the method, in the process of preparing the thermotropic liquid crystal polymer by using p-hydroxybenzoic acid / p-acetoxybenzoic acid, 6-hydroxy-2-naphthoic acid / 6-acetoxy-2-naphthoic acid, hydroquinone / hydroquinone diacetate and terephthalic acid, the molar ratio of the hydroquinone / hydroquinone diacetate to the terephthalic acid is controlled to be (1.005-1.025): 1. The molecular weight of the polymer product is controlled by controlling the addition amount of certain monomers, so that the polymerization time can be greatly shortened and the production efficiency is improved.

The present invention relates to a new process of synthesizing conductive polymers from monomers substituted with amine group. The process provides simple synthesizing steps for the conductive polymers without using other additives such as stabilizers or emulsifiers. The conductive polymers synthesized according to the present invention have highly enhanced solubility in common organic solvents and electrical conductivity compared to conventional conductive polymers. Therefore, the conductive polymers synthesized according to the present process can be utilized in applications that require high electrical conductivity, for example an electro-magnetic interference shield or a transparent electrode of thin film, as well as in specific applications such as various conductive films, fibers, polymer blends, battery electrodes or conductive etch mask layers.

The invention discloses a method for preparing an acrylonitrile / methacrylic acid copolymer foam plastic, which comprises the following steps: adding deionized water, a suspending agent and a water-phase polymerization inhibitor into a reaction vessel, and stirring evenly; After the nitrile, methacrylic acid and initiator are mixed evenly, add to the reaction vessel, and stir at room temperature to obtain a stable suspension, heat up to the reaction temperature, and carry out free radical suspension polymerization reaction under the condition of stirring again; the slurry obtained after the reaction The mixture is dried; after drying, the obtained copolymer powder, carbonamide foaming agent, and bismaleimide (BMI) crosslinking agent are mixed evenly; the obtained mixture is hot-pressed and foamed, and heat-treated to obtain polymethacrylic Amine foam. The technical scheme of the invention has high production efficiency, high yield, stable product performance, simple and convenient operation, and environmental friendliness, thereby obtaining beneficial implementation effects.

The invention provides a synthesis method and application of a water soluble chitosan-based flocculant. The method comprises the steps of adding chitosan into acid solution, adding acylated monomer aqueous solution into the acid solution, uniformly stirring and mixing, performing vibration reaction for 1 to 10 h at 5 to 60 DEG C, performing precipitation and purification through ethyl alcohol and acetone, drying, and obtaining N-acylated chitosan; sequentially adding the N-acylated chitosan, deionized water, acrylamide and strong cation functional monomer into a reactor, uniformly stirring, leading nitrogen into homogenous solution to remove oxygen, adding a photoinitiator and a cosolvent, uniformly stirring and mixing, putting the raw materials into an ultraviolet light reaction device to perform polymerization reaction, drying, performing granulation and powder process, and obtaining the water soluble chitosan-based flocculant; the flocculant can be used for the removal treatment of alga in source water. The flocculant is good in solubility property, high in viscosity coefficient and short in synthesis time, does not need temperature reduction control, simplifies the production technology, reduces energy consumption, and reduces the production cost.

The invention discloses a titanium-silicon catalyst and a preparation method as well as an application thereof. The preparation method includes the following steps: (1) organic titanic acid ester and 2 / 3 cubic content of anhydrous alcohol are mixed evenly, and stirred sufficiently to achieve A solution; deionized water is mixed with the remained 1 / 3 cubic content of anhydrous alcohol sufficiently, acid or alkali is added, the acid or alkali concentration is controlled within 0.01-1mol / L, B solution is prepared, and B solution is dripped into A solution by a burette; (2) the mixture is stirredfor 3-5 hours after dripping, the precipitate achieved after centrifugal separation is grinded and calcined to achieve titanium-silicon catalyst. The titanium-silicon catalyst achieved by the method is stable during the process of polymerization without hydrolysis reaction; the method can be used to catalytic synthesis of aliphatic and aromatic co-polyester, the titanium-silicon catalyst can reduce the dosage of catalyst, shorten the duration of polymerization, improve the quality of biodegradation co-polyester product, and the terminal carboxyl group content in the product as well as the b value are reduced.

The present invention relates to a new process of synthesizing conductive polymers from monomers substituted with amine group. The process provides simple synthesizing steps for the conductive polymers without using other additives such as stabilizers or emulsifiers. The conductive polymers synthesized according to the present invention have highly enhanced solubility in common organic solvents and electrical conductivity compared to conventional conductive polymers. Therefore, the conductive polymers synthesized according to the present process can be utilized in applications that require high electrical conductivity, for example an electro-magnetic interference shield or a transparent electrode of thin film, as well as in specific applications such as various conductive films, fibers, polymer blends, battery electrodes or conductive etch mask layers.