185 results about "Impurity" patented technology

There is provided a thin film transistor having improved reliability. A gate electrode includes a first gate electrode having a taper portion and a second gate electrode with a width narrower than the first gate electrode. A semiconductor layer is doped with phosphorus of a low concentration through the first gate electrode. In the semiconductor layer, two kinds of n⁻-type impurity regions are formed between a channel formation region and n⁺-type impurity regions. Some of the n⁻-type impurity regions overlap with a gate electrode, and the other n⁻-type impurity regions do not overlap with the gate electrode. Since the two kinds of n⁻-type impurity regions are formed, an off current can be reduced, and deterioration of characteristics can be suppressed.

A deformable Al-Mn alloy contains Si (0-0.6%), Fe (0-0.7%), Cu (0-0.3%), Mn (0.3-1.6%), Mg (0-1.3%), Ti (0.005-0.15%), RE (0-0.4%), B (0-0.03%), impurities (0-0.7%) and Al (rest). Its preparing process includes such steps as smelting fine-crystal Al ingot, adding others, smelting Al-Mn alloy, and pressure machining.

There are provided a chemical treatment cartridge capable of executing various extraction processes with ease and a method of using the same. There are formed recesses, each in a predetermined shape, in the back surface of an elastic member. The recesses create empty spaces between the cartridge substrate and the elastic member, thereby making up a well for receiving a sample, a well for pre-removing unnecessary moisture, a well for accommodating the sample at the time of distillation, a well for storing impurities therein, a well for taking out an object constituent, a flow path interconnecting the side surface of the cartridge and the well, a flow path interconnecting the well and the well, a flow path interconnecting the well and the well, a flow path interconnecting the well and the well and a flow path interconnecting the well and the well.

The invention relates to a method of preparing a vine tea mask capsule. The method comprises the steps of preparing vine tea powder, degreasing, extracting vine tea flavonoid, crystallizing and removing impurities, crushing and disinfecting, preparing mask capsule powder and finally filling the powder into a capsule. The vine tea mask capsule is composed of pure plant components, is antiseptic-free and additive-free, and causes no irritation and harm to skins. When a user is using the capsule, the user opens the capsule, fetches 80ML hot water with 80 DEG C, and slowly and uniformly pours thepowder in the capsule into the hot water while stirring. The user stirs the capsule powder to make the power fully dissolved and then pours into a mold plate. When the dissolved powder is cooled to be a mask, the user applies the mask onto the face for 20 to 30 minutes. The vine tea mask is prepared from pure natural konjac gum andxanthan gum, is crystal clear in appearance, and is fast in penetration and fine in absorption. No non-woven fabric needs to be a medium, and most essences are not liable to be absorbed by mask paper. Furthermore, various masks with beauty treatment efficacies can be prepared based on needs of skin whitening, skin dullness removal, rosy cheek improvement, acne clearance, toxin expelling or the like.

The present invention concerns a process for separation of a monomer including at least one double bond, hereafter referred to as “monomer,” in particular (meth)acrylic acid, from a composition Z including this monomer and at least one impurity different to the monomer, including the steps of bringing into contact of the composition Z with an additive by forming a separation phase. The additive has a melting point of at most about 150° C. and a vapour pressure at a temperature of 20° C. of at most about 1 mbar. The monomer is then separated from the separation phase. A device for producing a monomer, the use of additives in the separation of a monomer from a monomer-comprising composition, the monomer obtainable by the process according to the invention, chemical products comprising the monomer as well as the use of the monomer in or for production of chemical products.

The invention relates to a method for purifying citrulline from a watermelon, which comprises the following steps: removing the pulp of a citrulline, carrying out ultrasonic extraction twice to three times with acid water, settling impurities with a settling agent, purifying citrulline with macroporous resin columns and strong-acid cation resin columns in series, eluting with ammonia water, carrying out concentrative crystallization, dissolving roughly crystallized substances with acid water, adjusting the pH with ammonia water, recrystallizing and the like. The method has the advantages of high extraction efficiency, low energy consumption and high product purity.

The invention relates to a cotton blowing mechanism and a cotton picker consisting of the same. The cotton blowing mechanism comprises a shell, a cotton inlet, a cotton outlet, a thorn roller and an impurity discharge port; the lower part of the thorn roller is provided with an impurity removing screen; the cross section of a reinforced rib forming the impurity removing screen is a polygon; the cotton picker consisting of the cotton blowing mechanism comprises a cotton picking head, power, a transmission mechanism, a walking mechanism, a cotton storage tank and a manipulation mechanism; and the upper part of the cotton picker is provided with the cotton blowing mechanism. Compared with the prior art, the cotton blowing mechanism has a simple structure, does not substantially add the complexity of the mechanism and the destroying degree on cotton fibre and greatly improves the impurity removing effect when applied to the cotton picker in particular, can remove most of the cotton leaves, cotton hulls and other impurities in the process of completing cotton picking so that the impurity content of the picked cotton is greatly reduced and mechanical cotton picking can be suitable for the prior cotton processing equipment in Chinese cotton regions currently and reduces cost for cotton production.

The invention relates to high-performance graphitized free cutting steel for machining construction members. The high-performance graphitized free cutting steel comprises the following components in percentage by weight: 0.1-1.5% of C, 0.5-2.5% of Si, 0.05-2.0% of Al, not more than 1.0% of Mn, not more than 0.020% of P, not more than 0.02% of S and the balance of Fe and inevitable impurities, and simultaneously, the sum of Si and Al is 1.0-4.0%. In the invention, the graphitization time is not more than 5 hours, therefore, the production efficiency is greatly improved, and C in the steel can be converted into graphite within the time period; and moreover, graphite granules have small size and are evenly distributed, and the high-performance graphitized free cutting steel does not contain harmful elements to the environment and has the advantages of good cutting performance, cold molding and high fatigue strength.

The invention discloses a slurry stirring device for coated fabric production. The slurry stirring device comprises a stirring tank and a base and is characterized in that a feeding hopper and a wateradding port are respectively arranged on two sides of the top of the stirring tank, a crushing motor is mounted on the lateral wall of the feeding hopper, a crushing roller is connected to the outputshaft of the crushing motor through a reducer, crushing teeth are evenly distributed on the outer wall of the crushing roller, a filter screen is arranged at the bottom of the inner cavity of the stirring tank, an impurity cleaning push plate is arranged on the upper side of the filter screen, and the bottom of the stirring tank is fixedly connected with the base through damping spring columns. The slurry stirring device has the advantages that caked slurry can be crushed and refined before slurry stirring, slurry stirring time is reduced, impurities in the slurry can be removed through filtering by the aid of the filter screen arranged in the stirring tank, the quality of mixed slurry is increased, the impurity cleaning push plate arranged on the upper side of the filter screen can fastpush the impurities accumulated on the filter screen out of the stirring tank, and manual cleaning is not needed.

The present invention discloses a sulfur attack resistant steel and its smelting process. Said sulfur attack resistant steel can be used as steal for seamless steel conduit wiring tube, possesses favorable economy and excellent welding performance, can be applied widely for seamless steel conduit wiring tube for oil gas conveying in high acidic oil and gas fields. Said steel has the chemical constituent as follows (based on weight percentage ): C 0.08 -0.14%, Si 0.20 -0.30%, Mn 1.25 -1.45%, Nb 0.03 -0.05, Al 0.02 -0.05,Ti 0.02-0.05, and the rest is Fe and impurities. The present invention possesses the beneficial effects that the matching between the low carbon equivalent weight and the high strength in lateral direction and vertical direction is realized by adding two microalloy elements (Nb and Ti ) and introducing Al, as alloying element, into the sulfur attack resistant steel, and then said sulfur attack resistant steel possesses favorable economy and excellent welding performance, can be applied widely for seamless steel conduit wiring tube for oil gas conveying in high acidic oil and gas fields.

The invention discloses a full extracting process for preparing ultra-pure gadolinium oxide and a product thereof. Compared with the traditional ion exchange and chromatography extraction method, the process has the characteristics of large yield and low cost. The primary-pure gadolinium oxide (Gd2O3 at the grade of 99.99 percent) is obtained in advance by adopting a rough gadolinium enriching substance (Gd3O3 at the grade of 10-90 percent) as a raw material and adopting a mixed extracting agent of P507 and P204 through optimized control of factors, such as material liquid concentration, grade, phase ratio, acidity, and the like and classical extraction and separation in two steps; then the electrochemical reduction and the fully-closed type extraction and separation are performed for carrying out deep purification, and trace rare-earth element impurities are removed; and finally, the ultra-pure gadolinium oxide product with the rare-earth impurity content below 0.5ppm is obtained.

The invention discloses a halogen-free flame retardant and a preparation method thereof and a flame-retardant polyolefin composition composed of the same. The structural formula of the halogen-free flame retardant is shown in the description, wherein the ratio of x to y to z is 1:(5-10):(1-5). The preparation method comprises the steps that melamine, phosphoric acid and piperazine are weighed and put into a high-speed mixer of which the top is provided with a liquid spray device to be stirred and mixed to be uniform, and a halogen-free flame retardant premixed material is obtained; the halogen-free flame retardant premixed material is subjected to a high-temperature dehydration condensation reaction, and the polyphosphoric acid-melamine-piperazine composite salt halogen-free flame retardant is obtained. The halogen-free flame retardant with the composite salt structure has the advantages that the halogen-free flame retardant is good in heat stability, high in phosphorus content and free of impurities such as halogens and inorganic salts, and the index of whiteness is larger than 90; few synthesizing process steps are needed, operation is simple and easy to carry out, the requirement on equipment is low, and the product yield reaches up to 80% or above; the flame-retardant polyolefin composition containing the halogen-free flame retardant has the good flame-retardant property, high water-resistant and heat-resistant properties and the excellent pigmenting property.

An object of the invention is to provide a preparation process of a latent catalyst that can gives a latent catalyst, which can exert an excellent catalytic activity at the time of molding and therefore, can provide a resin composition having good curing property, fluidity and storage stability, in a short time in a high yield without mixing in ionic impurities. The present invention relates to a preparation process of a phosphonium silicate latent catalyst, comprising reacting (A) a proton donor represented by the following formula (1):

[Chemical Formula 1]

HY¹-Z¹-Y²H  (1)

[wherein Y¹ and Y² may be the same or different and each represents a group resulting from a proton donating substituent through release of a proton, Z¹ represents a substituted or unsubstituted organic group which bonds to the proton donating substituents Y¹H and Y²H, and two substituents Y¹ and Y² in the same molecule are capable of bonding to a silicon atom to form a chelate structure], (B) a trialkoxysilane compound and (D) a phosphonium salt compound represented by the following formula (2):

[wherein R¹, R², R³ and R⁴ may be the same or different and each represents an organic group having a substituted or unsubstituted, aromatic or heterocyclic ring or represents a substituted or unsubstituted aliphatic group and X⁻ represents a halide ion, a hydroxide ion or an anion resulting from a proton donating group through release of a proton], wherein the reaction is carried out in the presence of (C) a metal alkoxide compound.

An iron removing flux for Mg alloy contains magnesium chloride, potassium chloride, sodium chloride, calcium chloride, calcium fluoride and Ti (or Mn) compound. Its advantages are high effect on removing iron and other impurities from Mg alloy, high activity and low cost.

The invention relates to high-strength Mg-Y-Ni-Mn alloy and a manufacturing method thereof. The high-strength Mg-Y-Ni-Mn alloy comprises 5.0-12.5% of Y, 2.0-6.0% of Ni, 0.4-1.0% of Mn and the balance magnesium and inevitable impurities. The alloy is manufactured through the following process of material preparing, vacuum melting ingot casting, cyclic homogenizing annealing, extruding and double aging. Materials do not need to be refined; the extrusion ratio is low (lambda=11); the limitations that the manufacturing process of high-performance magnesium alloy is complex and the manufacturing conditions are rigorous are broken; the process is simple; transportability is high; operation is easy, the room temperature tensile strength and the yield strength of the alloy are obviously improved; the high-performance magnesium alloy can be directly produced under existing industrial conditions; the problem that the application of the Mg alloy is limited due to the poor mechanical performance of the Mg alloy is solved; and the application range of the magnesium alloy is expanded.

The invention discloses a sewage impurity filtering device, which comprises support legs. A filtered sewage output pipe and a filtrate discharge pipe are located on the support legs; a filter disc isconnected to the upper parts of the filtered sewage output pipe and the filtrate discharge pipe, and one side of the filter disc is connected to a sewage input device; a rotary column is vertically installed at the center of the filter disc; filter screens in different directions are uniformly dispersed at the edge of the rotary column; a tilted filter screen impurity cleaning apparatus is arranged at the lower part at the inner wall of the filter disc; a pressure discharge switch is installed in the filtered sewage output pipe; and a transmission apparatus connected to the pressure dischargeswitch and the rotary column is arranged at the rear outer wall of the filter disc. The problem that large impurity is left in sewage and blocks the filter screens is overcome, the sewage filtering efficiency is increased, and sewage and large impurity are automatically separated. The impurity left on the filter screens doesn't need manual cleaning. The sewage impurity filtering device is convenient for people, simple in structure and convenient to use.

The invention provides a purification method for gallium, which comprises the following steps of pre-purification, freezing crystallization, pickling, and packaging, wherein in the pre-purification step, liquid gallium is put into single equipment containing pickling liquid for stirring reaction, ultrasonic vibration is adopted, and spongy gallium impurities are separated from the liquid gallium preliminarily; in the freezing crystallization step, the liquid gallium separated preliminarily is subjected to freezing crystallization treatment, and heavy metal impurities in the gallium are removed; in the pickling step, the gallium subjected to the freezing crystallization treatment is placed into the single equipment for heating and fusing, a pickling solution is added and stirred, and the gallium is separated from spongy gallium through the ultrasonic vibration after stirring; and in the packaging step, the gallium separated after the pickling step is completed is packaged. The purification method can better achieve a purification effect; the purification flow is simple; the purification method can be automatically controlled easily, and is safe, environment-friendly and power-saving; no special equipment is required; and the enterprise cost is lowered.

The invention provides a method for preparing chitosan with ultrahigh deacetylation degree from euphausia superba as a raw material. The method sequentially comprises the following steps: removing mineral substances, removing proteins and lipids, removing mineral substances, removing proteins and lipids, deacetylating and purifying. According to the method, the euphausia superba is taken as the raw material, and the prepared chitosan has few impurities and a high deacetylation degree, and can be applied to the fields of medicines and biology.