200results about How to "Extended opening time" patented technology

The invention is directed to latex compositions comprising sequentially designed polymer having a first stage, a second stage and a third stage corresponding to a seed, a core and a shell. The latex polymer is suitable for aqueous low volatile organic compounds (“VOC”) paint (less than 50 g / L) with good block resistance, improved open time and increased water softening resistance. To attain good block resistance, the seed and the core contain monomers that form polymers with relatively harder characteristics and higher glass transition temperature (“Tg”) while the shell contains monomers that form polymers with softer characteristics and lower Tg. To gain improved open time, the latex polymer contains suitable level of hydrophilic monomers necessary to hold water. To achieve water softening resistance, hydrophobic monomers are grafted on hydrophilic portions of the shell or the core layers. The invention is also directed to the process of making the latex by a sequential emulsion polymerization.

A two-part adhesive systems exhibiting improved fixture and open times are disclosed. In one embodiment, the system includes (a) an adhesive part being a mixture formed from (I) an ethylenically unsaturated monomer, (II) a metal molybdate, (III) a metal salt of an ethylenically unsaturated carboxylic acid in an amount less than 3 weight percent, and (IV) an ethylenically unsaturated carboxylic acid, and (b) an activator part which includes a free radical generator. In another embodiment, the system includes the above-described adhesive part substantially free of a metal salt of an ethylenically unsaturated carboxylic acid. Curable adhesives and laminates prepared with the two-part system are also disclosed.

An apparatus for dispensing a post-foaming gel soap is disclosed. The dispenser includes a housing containing a first actuator and a second actuator. A motor is operatively connected to said first and second actuator. A circuit is connected to said motor, as well as a sensor assembly and a power supply. In operation, said first and second actuator moves a stem valve and a cylindrical pump located on a reservoir containing a gel soap and an inert propellant gas. The cylindrical pump operates on a piston principle and also closes to prevent any dripping after use. Further disclosed are various methods of accurately dispensing a consistent dose of gel soap.

A chatter resistant shuttle valve is provided to direct fluid flow from at least two sources of pressurized fluid to a downstream apparatus. The shuttle valve includes a valve body with a shuttle valve member movably mounted inside. A dampening chamber is provided which dampen opening movement of the shuttle as it moved from a closed position on one side of the shuttle toward a closed position on the other end of the shuttle. One or more dampening chambers may be provided.

The present invention relates to water soluble open time extenders, which are mixed with an architectural coating, such as aqueous latex paints, to increase the coating's open time and crosslink to the architectural coating upon drying. The open time extender comprises neutralized water soluble polymers with hydrophobic, hydrophilic and cross-linkable monomers, and at least one crosslinking agent. The open time extender also comprises water and the total solid content of the open time extender is less than about 25% by weight.

The present invention provides wood adhesive binder compositions comprising a naturally occurring protein component, e.g. soy flour, and an oxazoline-functional group containing polymer or resin component, the two components in a solids weight ratio of from 60:40 to 98:2. As formulated, the compositions may comprise from 40 to 98 wt. % of the naturally occurring protein component, preferably, 50 wt. % or more. Preferably, the wood adhesive binder further comprises lignins or lignosulfonate. Where the wood adhesive binder compositions comprise lignins or lignosulfonates, they remain more fluid and workable at a higher pH such as, for example, 4.5 or more. Any of the compositions may be formulated with one or more in situ acid generator compound to insure more rapid cure on heating or pressing. The binder enables the provision of mechanically sound, low cost and biodegradable composites, such as, medium density fiberboard (MDF).

The invention discloses a high-voltage double-break circuit breaker. The high-voltage double-break circuit breaker comprises circuit breaker casings and driving mechanisms, wherein two arc extinguishing chambers are symmetrically arranged in the circuit breaker in a left and right manner, a certain distance is formed between the arc extinguishing chambers, movable cover-plate ends of the arc extinguishing chambers are oppositely arranged, a fixed contact and a movable contact are arranged in each arc extinguishing chamber, the movable contacts are electrically connected with each other and are connected with one ends of connecting-rod mechanisms, and the fixed contacts are led out of the arc extinguishing chambers; the driving mechanisms are connected with the other ends of the connecting-rod mechanisms at the same position through insulated tension rods, the driving mechanisms drive the insulated tension rods to move up and down so as to drive the connecting-rod mechanisms to synchronously move, and further the gathering movement and the separating movement of the movable contacts and the fixed contacts are synchronously realized, wherein the leading-out terminals of the two fixed contacts are used as the circuit access terminals of the circuit breaker. The high-voltage double-break circuit breaker disclosed by the invention solves the problem that the switching voltage of vacuum circuit breakers is not high, and besides, the time for opening or closing a brake is shortened; the mechanical structure is simple, and the reliability of the circuit breaker is improved.

The invention relates to the technical field of integrated circuit chip electro-static discharge protection, in particular to a multiple RC triggered power supply clamp electro-static discharge (ESD) protective circuit. The circuit detects access of static pulses through an ESD impact detecting unit and sends response signals to a tapping transistor to open a passage, the tapping transistor releases electrostatic charges carried by impacts and then the tapping transistor close the passage, and small leakage during normal electrification is guaranteed. Furthermore, a CR structure is used for replacing an RC+ inverter structure to serve as the ESD impact detecting unit, a circuit structure is simplified, and opening time of the tapping transistor is prolonged to some extent. Further, passive capacitance of the tapping transistor for closing the passage uses a current mirror unit, and opening time of the tapping transistor can be effectively prolonged. Therefore, the protective circuit can effectively prolong opening time of the tapping transistor under the ESD impact in a reasonable domain area and guarantees that leakage of the protective circuit during normal electrification is small.

The invention provides a power clamping electrostatic discharge protection circuit which comprises a power pin, a grounding pin, a decision circuit (310), a time-delay circuit (320), a trigger circuit (330) and a clamping circuit (340), wherein the decision circuit (310) is used for sensing of an electrostatic discharge voltage, the time-delay circuit (320) is used for recording and storing a sensed electrostatic discharge voltage signal so as to provide time delay, the trigger circuit (330) is used for converting the electrostatic discharge voltage signal stored by the time-delay circuit (320) to an electrostatic discharge trigger signal, and the clamping circuit (340) is used for bleeding electrostatic current after the electrostatic discharge trigger signal is received. The decision circuit and the time-delay circuit are separated, the probability of clamping circuit false triggering caused by rapid electrifying is avoided, and meanwhile, a longer starting time for the clamping circuit can be obtained when electrostatic discharge impact occurs, and the reliability of electrostatic discharge protection is improved.

Disclosed are low Tg latex polymers and low VOC aqueous coating compositions having an improved open time profile, as well as drying time, stain resistance, wet edge time, low temperature film formation, block resistance, adhesion, water sensitivity and low-VOC content. The latex polymers and aqueous coating compositions include at least one latex polymer derived from at least one monomer copolymerized or alkoxylated compounds or blended with an alkoxylated compound, for example an alkoxylated tristyrylphenol or an alkoxylated tributylphenol. Also provided is an aqueous coating or adhesive composition including at least one latex polymer, water and one or a blend of two or more open time additives or drying time additives. The blend can comprise nonionic and anionic open time additives. Typically, the open time and / or drying time additive is present in an amount greater than about 1.3% by weight of the polymer or composition, typically in an amount greater than about 2% by weight of the polymer or composition, in an amount greater than about 4% by weight of the polymer or composition, in an amount greater than about 7.5% by weight of the polymer or composition, in an amount greater than about 10% by weight of the polymer or composition or in an amount greater than about 20% by weight of the polymer or composition.

The invention provides an ESD (electrostatic discharge) power supply clamping protection circuit. The ESD power supply clamping protection circuit comprises a power supply end, a grounding end, an electrostatic discharge (ESD) detection circuit, a triggering holding circuit and a leakage circuit, wherein the power supply end is used for supplying a power supply voltage; the grounding end is used for supplying a ground electrical level; the ESD detection circuit is used for detecting an ESD shock signal and outputting an ESD trigger signal; the triggering holding circuit is used for triggering a discharging transistor in the leakage circuit to be switched on according to the ESD trigger signal, and prolonging the starting time of the discharging transistor through a feedback mechanism; and the leakage circuit is used for supplying a low-resistance channel between the power supply and the ground when the ESD trigger signal output by the triggering holding circuit is received so as to realize electrostatic current discharge. The ESD power supply clamping protection circuit provided by the invention can effectively restrain current leakage of the electrostatic protection circuit and can effectively prevent the internal circuit from being damaged by electrostatic discharge.

The invention relates to an aqueous coating composition comprising a film-forming first polymer and a second polymer for improving the open time, the wet edge time, adhesion and / or hardness of the resulting coating. The invention further relates to said novel second polymer, its use in coating compositions for improving the open time and coalescence. The water soluble second polymer is an addition polymer comprising 25-95 wt % specific non-ionic hydrophilic monomers A and 5-75 wt % of hydrophobic monomers B which second polymer is sparingly water soluble and a solution of only said second polymer in water has a substantially Newtonian flow behaviour in a wide solid contents range.

The invention discloses a power-off ghosting elimination control circuit and a control method thereof and a liquid crystal display device. After voltage rectification and voltage division through a rectification and voltage division module, switch control signals are outputted; when an alternating-current power supply is in power failure, voltage of the switch control signals is reduced to be notlarger than preset voltage, and a voltage division control module is controlled to output first-level discharge control signals; in power supply through the alternating-current power supply, the voltage of the switch control signals is increased to be larger than the preset voltage, and the voltage division control module is controlled to output second-level discharge control signals; only under the control of the first-level discharge control signals, a level switch module outputs gate-on signals to all TFT gates in a liquid crystal display panel to control on of TFTs. Therefore, by detectionof voltage of the alternating-current power supply after rectification and voltage division, all TFTs in a liquid crystal display panel can be turned on when the alternating-current power supply is in power failure, and power-off ghosting elimination effects are improved.

The invention provides an electromagnetic resonance control circuit, an electromagnetic heating device and a method for controlling a transistor. The electromagnetic resonance control circuit comprises a power module, a resonance circuit, the transistor and a controller, the resonance circuit is connected to the power module, the transistor is arranged between the resonance circuit and the ground, and used for executing the power-on or power-off operation according to pulse width modulation signals sent by the controller to control the work state of the resonance circuit, and the controller is connected to the power module and the control end of the transistor, and used for adjusting the duty ratio of the pulse width modulation signals sent to the transistor according to the change condition of voltages output to the resonance circuit by the power module to control the power-on time of the transistor. According to the technical scheme, the power-on time of the transistor can be controlled according to the voltages output to the resonance circuit, power output is increased in a low-voltage area, power output is reduced in a high-voltage area, the peak voltage and the peak current of the transistor are reduced under the condition of identical power, and therefore the transistor is effectively protected.

The invention relates to a waterproof structure used to avoid the water at the surface of joints of cement concrete road and bridge plate to leak into road and bridge, and a method for using waterproof sheet to avoid the surface water at the joints leaked into inner structure, belonging to road project technique. The invention irrigates, adheres or mounts sheet structure on the joints of cement concrete road and bridge, irrigates, adheres or mounts waterproof sheet structure when irrigates or mounts road and bridge plates, while the sheet structure can be plane, or fold shape, with aging resistance and corrosion resistance corresponding to the road and bridge plates. The invention can adapt with deformation and movement of road and bridge plates, to seal and avoid water leaked into road and bridge, with simple structure, easy construction, improved waterproof effect, prolonged service life of road and bridge and improved application property, improved normal traffic time, reduced maintenance and construction costs of road and bridge.

The invention relates to a drive circuit for preventing the oscillation of grid drive signals. The drive circuit is characterized by comprising a buffer circuit, an amplitude limiting circuit and a rapid discharge circuit, wherein the buffer circuit receives and processes a drive signal PWM (Pulse Width Modulation) and then outputs the signal to the amplitude limiting circuit; the amplitude limiting circuit processes the received signal and then respectively outputs the signal to the grid of an MOS (Metal Oxide Semiconductor) transistor and the rapid discharge circuit; and the rapid discharge circuit also receives the drive signal PWM. The drive circuit has the advantages of lowering the voltage change rate of the MOS transistor, decreasing the open surge in the opening process, reducing the impact and damage to the MOS transistor, improving the EMC (Electro Magnetic Compatibility) property of the whole switch power supply, decreasing the turnoff loss, effectively avoiding the abnormal oscillation of drive signals, protecting normal working states of the MOS transistor and the circuit, and the like.

The invention discloses 3D (three-dimensional) overvoltage confirming method, an LCD (Liquid Crystal Display) driving method, an LCD system and a television and mainly aims at providing a method for precisely confirming the overvoltage parameter under a 3D state. The 3D overvoltage confirming method comprises the following steps: 1.1 measuring the brightness of a plurality of different gray scales at 0 and 255 and at the range from 0 to 255 of an LCD as reference brightness; 1.2 presetting overvoltage needed by change between two different adjacent grey scale images; 1.3 driving the display by utilizing the preset overvoltage to test the brightness of the LCD after a set time for driving of the overvoltage correspondingly as test brightness; 1.4 comparing the reference brightness with the test brightness, if not, regulating the overvoltage according to the comparison result, and returning the step 1.3, and if yes, stopping. According to the invention, the accuracy of the overvoltage is further improved, and the brightness of the LCD is effectively promoted.

An apparatus and method for controlling hydrogen purging are provided. The hydrogen purging control apparatus includes a purge valve that is disposed at an outlet on an anode side of a fuel cell stack and is configured to adjust an amount of emission of hydrogen containing impurities. Additionally, a controller is configured to adjust an opening and closing cycle of the purge valve based on a required output or an output current of the fuel cell stack.

The invention relates to the technical field of integrated circuit chip ESD (Electronic Static Discharge) protection, in particular to a high-reliability power supply clamping ESD protection circuit. The ESD protection circuit comprises a capacitor-resistor module (1), a clamping transistor open module (2), a clamping transistor (4) which are connected in sequence; the ESD protection circuit also comprises a clamping transistor close module (3) which is respectively connected with the capacitor-resistor module (1) and the clamping transistor (4). According to the invention, through separating a circuit structure used for controlling the open and close of the clamping transistor, the clamping transistor can obtain enough open time under the condition that of the capacitor-resistor module in the ESD protection circuit has very small time constant.

An aqueous coating composition having an extended open time and capable of providing coating films with good properties including stain resistance and block resistance, a process of preparing the aqueous coating composition, and a method of extending open time of an aqueous coating composition.

The invention relates to an anti-slide tie-steel pipe pile composite structure for repairing a cave-in roadbed and a method, which belong to the technical field of constructional engineering. The anti-slide tie-steel pipe pile composite structure for repairing the cave-in roadbed comprises prefabricated anti-slide ties, a prefabricated steel pipe pile and inhaul cables, wherein the prefabricated anti-slide tie is fixed in a stable soil under a cave-in body; the prefabricated steel pipe pile is arranged at the front edge of the cave-in body and fixed in the stable soil body; the inhaul cable is flatly laid in a fill; and two ends of the inhaul cable are respectively fixed on the prefabricated anti-slide tie and the prefabricated steel pipe pile. The anti-slide tie-steel pipe pile composite structure further comprises geogrids, wherein the geogrids and the inhaul cable are simultaneously laid in the fill; and the two ends of the geogrids are respectively fixed on the prefabricated anti-slide tie and the prefabricated steel pipe pile. The invention further provides a method for repairing the cave-in roadbed by using the anti-slide tie-steel pipe pile composite structure. The whole repairing method is simple in the construction process, the road repairing time is saved, and the method is suitable for roadbed cave-in projects which need to be rapidly repaired. The anti-slide tie-steel pipe pile composite structure for repairing the cave-in roadbed exerts a very good anti-slide supporting and retaining effect and can also preferably reduce roadbed settlement due to being provided with the geogrids.

The invention discloses a temperature and humidity control algorithm for an intensive curing barn controller and relates to the technical field of environmental control in facility agriculture. Optimized PID (proportion integration differentiation) algorithm is used, and accurate control of temperature and humidity is realized by a controller. The controller comprises a PID controller, a relay link and a fuzzy controller for calibrating PID parameters; the PID controller completes control algorithm and calculates the control amount of output; initial parameters of the PID controller are achieved through the relay link; the fuzzy controller conducts online and real-time adjustments of the PID parameters of KP, Ki and KD according to deviation e and deviation rate of change ec so that the PID controller has adaptive capacity, and the system is always in an optimal control state. The temperature and humidity control algorithm for the intensive curing barn controller has the advantages of calculating parameters and variation amount of various environmental conditions in a curing barn, realizing accurate control of the temperature and humidity of the curing barn, and the like. Furthermore, the temperature and humidity control algorithm for the intensive curing barn controller can be used as a temperature and humidity controller in an intensive curing barn in domestic regions of any different latitude to conduct algorithm.

The invention discloses an LED driving circuit and a dimming control method thereof. The LED driving circuit comprises a rectifier bridge for converting an AC input voltage into a DC bus voltage having a half power frequency period; A main circuit connected between the first output terminal and the second output terminal of the rectifier bridge for supplying the load current required by the LED and adjusting the duration of the load current in the half power frequency period according to the DC bus voltage so as to realize dimming; And a drain circuit connected between the first output terminal and the second output terminal of the rectifier bridge for supplying a drain current, wherein the drain circuit controls on and off of the drain current according to the DC bus voltage and the loadcurrent, and the drain current is used for supplying a sustain current of the dimmer. The LED driving circuit adopts different modes to compensate the discharge current according to different conduction angles of the thyristor in the dimmer, thereby suppressing the flicker of the LED lamp, improving the compatibility of the LED driving circuit and the thyristor dimmer, and expanding the dimming range.

The invention relates to moisture-reactive hotmelt adhesive compositions which comprise at least one polyurethane prepolymer P1 being liquid at room temperature containing isocyanate groups and also at least one linear polyurethane P2 being solid at room temperature which comprises polycaprolactone segments, contains hydroxyl groups and has a melt viscosity of 100-300 Pa·s at 170° C. The compositions are notable in particular for a prolonged open time.