36results about How to "Short defoaming time" patented technology

A transparent silicone gel for bonding liquid crystal screens. The raw material formula includes 35-55 parts of component A; 10-25 parts of component B; 15 parts of component C2; 5 parts of adhesion promoter; 5-25 parts of component E; 0.1-5 parts of the catalyst; 0.1-1.0 parts of the inhibitor; the component A is a vinyl-terminated polysiloxane conforming to the general formula (1): the component B is a vinyl-terminated polysiloxane conforming to the general formula (2) Propoxy polypropylene oxide: the component C is a vinyl MQ silicone resin, and the M:Q ratio is 0.8-1.5; the component E is a terminal hydrogen polysiloxane conforming to the general formula (3). The transparent silicone gel for bonding liquid crystal screens prepared by the invention has the advantages of low viscosity, short defoaming time, fast curing and molding, and moderate hardness.

The invention relates to a food antifoaming agent without bitterness and a preparation method thereof. The antifoaming agent is prepared from the raw materials of dimethicone, silicon dioxide, glyceryl polyether, span, tween and water. By means of regulating matching, reaction temperature and time, temperature rise speed, emulsification temperature and emulsification time of all components, the food antifoaming agent prepared through the method has no any bitterness. The preparation method avoids adding a thickening agent and is simple; a prepared product has the advantages of being stable and free of layering for a long time and having short defoaming time and long antifoaming time.

The invention belongs to the technical field of medicine preparation and relates to a preparation method for producing starch-based capsules. The method specifically includes the following steps: starch etherification, gelatinization, defoaming, impurity removal, gel-dipping molding and the like. The hydroxypropyl starch capsule prepared by the invention not only has the advantages of smooth surface, high transparency, short disintegration time limit, etc., but also simplifies the production process, saves production cost, and is suitable for industrial production.

The invention discloses a defoaming kettle and a defoaming method for preparing polyamide acid resin. A thin layer distributor with an arch rotary curve surface is fixedly installed in a defoaming kettle tank body; the distance from the curve surface arch top of the thin layer distributor to the lower end opening of a feeding pipe ranges from 0.01mm to 1 / 3 of the height of the tank body; the clearance between the lower edge of the curve surface of the thin layer distributor and the inner wall of the tank body is 0.01mm-10mm; the rotary curve surface of the thin layer distributor is a spherical surface; a resin conveying pipeline between a reaction kettle and the defoaming kettle is provided with a metering pump; the tank body is provided with a sandwiched sleeve, and an heat conduction medium inlet and outlet are formed at the top and bottom of the tank body. The defoaming method comprises the step that resin entering the defoaming kettle falls on the arch top of the curve surface of the thin layer distributor, and disperses and flows downward along the curve surface of the thin layer distributor to form a thin layer which results in bubble breakage. The metering pump is used for adjusting the flow rate of resin so as to keep that the thickness of the resin solution layer on the thin layer distributor is less than 5mm. Defoaming is completed immediately when resin is conveyed completely, and then pressurization is carried out for discharging. During defoaming, a heat conduction medium is introduced for warming, and negative pressure is kept in the tank body. According to the invention, defoaming is complete, and the defoaming time is shortened greatly so as to guarantee subsequent continuous film preparation. The defoaming kettle is simple in structure and convenient to operate.

The invention discloses alkaline cleaning composition for dairy product processing equipment. The alkaline cleaning composition is prepared from 1%-5% of a nonionic surfactant, 1%-5% of a stabilizer, 3%-5% of a chelating agent, 0.5%-3% of a penetrating agent, 2%-6% of a dispersing agent, 2%-5% of a bactericide, 20%-30% of strong base, 0.5%-2% of a scale adsorbent and the balance of water. After a surface is treated with the alkaline cleaning composition, the time for foam to reduce to 5 mm or smaller is 10 s or longer. A preparation method of the alkaline cleaning composition comprises the following steps: deionized water and the strong base are mixed and stirred until dissolution; the chelating agent, the dispersing agent, the bactericide and the stabilizer are added sequentially and stirred to dissolution, and the reaction temperature is controlled at 50-60 DEG C in the stirring process; the penetrating agent, the nonionic surfactant and the scale adsorbent are added sequentially and stirred until complete dissolution and clear and transparent solution appearance are realized, and a product is cooled to room temperature. The alkaline cleaning composition is low in corrosivity, strong in cleaning force, little in foam, easy to rinse, resistant to scale redeposition and capable of killing bacteria and inhibiting corrosion and scale, and is an efficient environment-friendly cleaning agent.

According to the aqueous ophthalmic composition comprising (A) polyoxyethylene castor oil and (B) sesame oil, defoaming time is reduced, preservative efficacy is enhanced, and photostability is improved.

The invention belongs to the field of food additives, and particularly relates to a defoaming agent for food and a preparation method of the defoaming agent. The defoaming agent is prepared from 15%-22% of polysiloxane, 3%-10% of polyether-modified silicone oil, 6%-12% of hydrophobic white carbon black, 3%-5% of an emulsifying agent, 3%-6% of a thickening agent and 30%-70% of water, wherein polysiloxane is prepared from dimethicone I with the viscosity of 0.1-0.5 pa.s, dimethicone II with the viscosity of 50-100 pa.s and hydroxyl silicone oil according to the weight ratio of 1:(0.6-0.8):(0.3-0.5). The defoaming agent for the food has the advantages of being high in defoaming and foam inhibiting capacity, good in stability and the like and is safe, free of toxicity, easy to prepare, low in production cost and suitable for usage and application.

The invention discloses a defoaming method in the synthesizing process of polyamide resin. The method comprises the following steps: heating and slowly stirring polyamide resin solution in a kettle at first at the temperature of 35 to 100 DEG C at normal pressure for 0.5 to 1.5h, wherein the stirring speed is less than or equal to 50r / min; then, quickly stirring the polyamide resin solution at a stirring speed of 60 to 100r / min at the same temperature for 2 to 4h; and casting film when the defoaming is completed, wherein CO2, nitrogen or other inert gas can be fed during the casting of the film to prevent the resin from discoloring and deteriorating at a gas flow of 0.1 to 0.8 m<3> / min, and a relative pressure of 0.3 to 0.5MPa is kept in the kettle. According to the method, the foaming is thorough, the surface quality of the film obtained later is improved, the defoaming time is short and the defoaming process is convenient in operation.

The invention discloses a method for continuously preparing p-phenylene terephthalamide (PPTA) fiber, including the steps of: (1) continuously adding 98-100% oil of vitriol and PPTA with specific logarithmic viscosity of 4.0-8.5 dl / g to an double spiral extruder, where the weight percent of PPTA is 14-24% and the mixing temperature is 50-100 deg.C; (2) fully mixing and entering in the other extruder, where the adjusting temperature is 50-100 deg.C and the staying time is 10-60 min, fully mixing, adjusting temperature and defoaming and then extruding them; (3) after measuring and filtering spinning solution, obtaining the invention by the routine steps, such as dry spraying-wet spinning. The advantages are short time for mixing materials, adjusting temperature and defoaming high mixing uniformity of materials able to implement continuous, stable filature in a short time, raising the production efficiency.