46results about How to "High limit temperature" patented technology

Disclosed is a novel compound, namely a pentacyclic liquid crystal compound having a CF2O bonding group, which has general physical properties necessary for a compound, stability against heat and light, a wide temperature range of a liquid crystal phase, a high clearing point, good compatibility with other compounds, and large dielectric anisotropy and large refractive anisotropy. This pentacyclic liquid crystal compound has a particularly high clearing point and particularly large refractive anisotropy. Also disclosed are a liquid crystal composition and a liquid crystal display.

The invention relates to a heat-transfer heat-accumulation medium prepared by combining quartz sand and a multi-composition molten nitrate salt and a preparation method, and belongs to the field of solar photo-thermal power generation. The heat-transfer heat-accumulation medium is composed of a multi-composition molten nitrate salt system and quartz sand. The invention also provides the preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium disclosed by the invention keeps the low melting point of the multi-composition molten nitrate salt, and also helps to improve the upper limit operating temperature of the multi-composition molten nitrate salt, and the upper limit operating temperature is up to 700 DEG C. The heat-transfer medium is low in cost, wide in operating temperature range, good in heat stability and high in thermal conductivity, and is extremely suitable for a solar thermal power generation system and a heat-accumulation heat-transfer system based on solar photo-thermal power generation.

Disclosed is a liquid crystalline medium which has a wide liquid crystal phase temperature range, a high refractive index anisotropy and high dielectric anisotropy, and has an optically isotropic liquid crystal phase. The liquid crystalline medium comprises a liquid crystalline compound having a pyridine ring and a linking group -CF2O- and a chiral agent, and can exhibit an optically isotropic liquid crystal phase.

The invention provides a liquid crystal composition and an application thereof. Based on 100 percent by mass of the composition, the liquid crystal composition comprises the following components in percentage by mass: 0-70 percent of a nematic liquid crystal compound shown as a formula I, 0-50 percent of a nematic liquid crystal compound shown as a formula II, 0-50 percent of a nematic liquid crystal compound shown as a formula III, 0-30 percent of a nematic liquid crystal compound shown as a formula IV and 0-30 percent of a nematic liquid crystal compound shown as a formula V. The liquid crystal composition has high birefringence rate, and has the characteristics of high upper limit temperature of a nematic phase, low lower limit temperature of the nematic phase, low rotation viscosity, high response speed and the like. The liquid crystal composition provided by the invention can be applied in the fields of variable-focus liquid crystal lenses and the like.

Disclosed is a liquid crystal compound having general properties required for a compound; stability against heat, light and the like; a wide liquid crystal phase temperature range; a high clearing; good compatibility with other liquid crystal compounds; and a large refractive index anisotropy and dielectric constant anisotropy. Further disclosed is a liquid crystal composition containing said liquid crystal compound. Further disclosed is a liquid crystal display element containing said liquid crystal composition. The compound is expressed by general formula (1). (1) For example, R1 is an alkyl with 1-20 carbons; at least one of the rings A1-A6 is pyrimidine-2,5-diyl or pyridine-2,5-diyl, with the remainder being 1,4-cyclohexylene or 1,4-phenylene; Z1-Z6 are single bonds; L1-L4 are hydrogen or a halogen; X1 is hydrogen, a halogen, -C=N, or an alkyl with 1-10 carbons; and l, m, n, o, p, and q are 0 or 1, with l+m+n+o+p+q= 3.

The invention discloses a heat-transfer heat-accumulation medium prepared by combining quartz sand and a ternary molten nitrate salt and a preparation method thereof, and belongs to the field of solar energy photo-thermal electricity generation. The heat-transfer heat-accumulation medium is composed of a ternary molten nitrate salt system and quartz sand. The invention also provides a preparation method of the heat-transfer heat-accumulation medium. The heat-transfer heat-accumulation medium basically does not change the freezing point of the ternary molten nitrate salt, also the upper limit operating temperature of the ternary molten nitrate salt is improved and is up to 750 DEG C. The heat-transfer heat-accumulation medium is good in thermal stability, high in thermal conductivity, low in cost and extremely suitable for solar energy thermal power electricity generation systems and solar energy photo-thermal electricity-generation heat-accumulation heat-transfer systems.

Provided is a polar compound which has high chemical stability and high ability of aligning liquid crystal molecules, and which enables the achievement of high voltage holding ratio if used for a liquid crystal display element. A compound represented by formula (1). (In the formula, R1 represents, for example, an alkyl group having 1-15 carbon atoms; each of rings A1-A5 represents 1,4-cyclohexylene or 1,4-phenylene; each of Z1 and Z5 represents a single bond or an alkylene group having 1-10 carbon atoms; each of a and b represents a number of 0-4, and the sum of a and b is 4 or less; d represents a number of 1-4; each of c and e represents a number of 0-4; each of P1-P3 represents a polymerizable group represented by one of formulae (P-1)-(P-5), wherein each of M1-M3 represents a hydrogen atom or an alkyl group having 1-5 carbon atoms; and R2 represents a group represented by one of formulae (1a)-(1c), wherein each of Sp1-Sp5 represents a single bond or an alkylene group having 1-10 carbon atoms, S1 represents >CH-, S2 represents >C<, and X1 represents -OH.)

The compound represented by formula (1). For example, the rings A1, A2, A3 and A4 are 1,4-phenylene, Z1 and Z2 are alkylene having 1 to 10 carbons in which at least one —CH2— may be replaced by —O— or —CH═CH—; L1, L2 and L3 are a single bond, —COO— or —CH═CH—; G1 and G2 are —O—; s, t and u are 0 or 1; and P1 and P2 is the group (P-1), the group (P-2) or the group (P-3). M1 and M2 are hydrogen or methyl.

Provided is a polar compound having high chemical stability, high ability to align liquid crystal molecules, and high solubility in a liquid crystal composition, and which has a large voltage holding ratio when used in a liquid crystal display element. A compound represented by formula (1). For example, R2 represents a C1-15 alkyl, MES represents a mesogenic group having at least one ring, Sp1 represents a single bond or a C1-10 alkylene, M1 and M2 represent hydrogen, R2 represents a group represented by formulas (1a) through (1c), Sp2 and Sp3 are single bonds or C1-10 alkylenes, S1 represents >CH-, S2 represents >C<, and X1 represents -OH.

A liquid crystal medium, which has a liquid crystal phase over a wide temperature range, a large refractive index anisotropy, and a large dielectric anisotropy, and exhibits an optically isotropic liquid crystal phase, is provided. The liquid crystal medium is characterized by containing a liquid crystal compound having four benzene rings and a difluoromethyleneoxy group, and a chiral reagent, and exhibiting an optically isotropic liquid crystal phase.

Disclosed are a compound which has a large refractive index anisotropy, a large dielectric constant anisotropy, and a low melting point; and a liquid crystal medium which has a wide liquid crystal phase temperature range, a large refractive index anisotropy, a large dielectric constant anisotropy, and an optically isotropic liquid crystal phase. Specifically disclosed are a liquid crystal compound which has a chlorobenzene ring, and a liquid crystal medium which contains the liquid crystal compound and a chiral agent and exhibits an optically isotropic liquid crystal phase.

Disclosed is a liquid crystalline compound which is stable against heat, light or the like and has a nematic phase in a wide temperature range, while having a low viscosity, an adequate optical anisotropy, an adequate dielectric anisotropy and excellent compatibility with other liquid crystalline compounds. A liquid crystal composition containing the liquid crystalline compound, and a liquid crystal display element containing the liquid crystal composition are also disclosed. The liquid crystalline compound is represented by formula (a). In formula (a), Ra represents, for example, an alkyl having 1-10 carbon atoms; Rb represents, for example, an alkenyl having 2-10 carbon atoms; La represents, for example, a hydrogen; and Z1, Z2 and Z3 each represents, for example, a single bond. The liquid crystal composition contains the liquid crystalline compound, and the liquid crystal display element contains the liquid crystal composition.

Provided is a liquid crystal medium which has stabilities to heat, light and so on, a wide liquid crystal phase temperature range, a large refractive index anisotropy, and a large dielectric anisotropy and which exhibits an optically isotropic liquid crystal phase. A liquid crystal composition which comprises, as the first component, an achiral component (T) containing at least one compound selected from the group consisting of compounds represented by formula (1) shown in the description [wherein R1 is C1-20 alkyl or the like; L1, L2, L3, L4, L5 and L6 are each independently hydrogen or fluorine; and X1 is halogen or the like], and contains a chiral agent, and which is characterized by exhibiting an optically isotropic liquid crystal phase.

A polymer containing perspex as its main component features that the content of its syndiotactic structure is 55 mole% and its weight decreasing temp is 290 deg.C or higher for the 5 Wt%. Its advantage is high resistance to thermocracking and high temp.

The purpose of the present invention is to provide a liquid crystal composition having the appropriate balance in relation to at least one or at least two characteristics from among characteristics such as the following: a high nematic phase upper-limit temperature; a low nematic phase lower-limit temperature; low viscosity; appropriate optical anisotropy; large dielectric anisotropy; large relative permittivity; high stability with respect to ultraviolet rays or heat; and a large elastic constant. A further purpose is to provide an active matrix element that has: a short response time; a large voltage retention rate; a low threshold voltage; a large contrast ratio; a large negative DC luminance relaxation time constant; and a long life. Provided are the following: a liquid crystal composition that has positive dielectric anisotropy, that contains, as an additive component, a compound which contributes to high-stability with respect to heat or ultraviolet rays, and that contains, as a first component, a prescribed compound having low viscosity; and a liquid crystal display element that contains the composition. The composition may contain the following: a prescribed compound which serves as a second component and has large positive dielectric anisotropy; a prescribed compound which serves as a third component and which has a high upper-limit temperature or low viscosity; or a prescribed compound which serves as a fourth component and which has negative dielectric anisotropy.

The invention discloses a solar boiler constant-temperature energy conservation control system capable of conducting composite amplification type temperature detection. The solar boiler constant-temperature energy conservation control system is composed of a boiler, a heater, a first water pump, a first ball valve, an air energy heat pump, a second water pump, a second ball valve, a softened water processor and a solar power generation system. The solar power generation system is composed of a solar cell panel, a protection circuit, a control circuit, a storage battery connected with the control circuit, a switch circuit connected with the storage battery, an adjustable integrated filtering and voltage stabilizing circuit connected between the switch circuit and the storage battery in series, and a composite amplification type temperature detection circuit connected between the adjustable integrated filtering and voltage stabilizing circuit and the switch circuit in series. The solar boiler constant-temperature energy conservation control system is characterized in that a constant-temperature adjustable circuit is connected between the switch circuit and the heater in series. The solar power generation system is adopted in a boiler heat supply system, energy is effectively saved due to the adoption of the solar boiler constant-temperature energy conservation control system, the pollution to the atmosphere is reduced, and real energy conservation and environment protection are achieved.

The invention relates to the technical field of preparation of nuclear fuel pellets, and particularly discloses a method for preparing an annular FCM pellet. The method comprises the following steps of: (1) processing a mould; (2), coating TRISO particles, and performing material mixing; (3), forming the annular FCM pellet; and (4), sintering the annular FCM pellet. The annular FCM pellet preparedby using the method has a good surface appearance, and the density and chemical composition of the annular FCM pellet can meet requirements of technical indexes, and can be applied to a light-water reactor.

The invention discloses a constant-temperature controllable inversion energy-saving control system integrating solar energy and a boiler. The constant-temperature controllable inversion energy-saving control system is composed of the boiler, a heater arranged at the bottom of the boiler, a first water pump, a first ball valve, an air energy heat pump, a second water pump connected with the air energy heat pump, a second ball valve connected with the second water pump, a softened water processor connected with the second ball valve and a solar power generation system connected with the heater. The solar power generation system is composed of a solar cell panel, a protection circuit, a control circuit, a storage battery, an adjustable integrated filtering voltage stabilizing circuit, an on-off circuit and a thyristor controllable inversion circuit. The constant-temperature controllable inversion energy-saving control system is characterized in that a constant-temperature adjustable circuit is further in series connection between the on-off circuit and the heater. The constant-temperature adjustable circuit is adopted and has high-precision constant voltage, constant current and temperature limiting effects and the like, the practicality and controllability of the energy-saving control system are improved effectively, and genuine energy saving and environmental protection are achieved.

The invention discloses a high-temperature-resistance carbon aluminum composite pipe in the technical field of carbon aluminum composite pipes. The high-temperature-resistance carbon aluminum composite pipe comprises a carbon aluminum composite pipe body; a high-temperature resisting layer is wrapped on the outer wall of the carbon aluminum composite pipe body; a thermal insulation layer is wrapped on the outer wall of the high-temperature resisting layer; heat conducting columns are uniformly mounted out of the thermal insulation layer; the ends, far from the thermal insulation layer, of theheat conducting columns are connected with cooling layers; condensation pipes, matched with the heat conducting columns, are uniformly mounted in inner cavities of the cooling layers; cooling liquid layers are mounted in inner cavities of the condensation pipes; the condensation pipes are connected through annular liquid guide pipes; liquid filling pipes are mounted at the tops of the annular liquid guide pipes; heat on the thermal insulation layers is transferred into the condensation pipes by the heat conducting columns; cooling liquid in the condensation pipes is used for cooling; the cooling liquid is injected through a liquid charging port; and the cooling liquid flows into three sets of liquid filling pipes through flow separation pipes, and flows into the annular liquid guide pipesto enter the condensation pipes for continuous cooling. The high-temperature-resistance carbon aluminum composite pipe is simple in structure, high in temperature upper limit, and good in cooling effect, and filling of the cooling liquid is convenient.

The invention provides a liquid crystal compound having general physical properties necessary for a liquid crystal compound, that is to say, stability to heat, light or the like, a small viscosity, a suitable value of refractive index anisotropy, a suitable value of dielectric anisotropy, steep characteristics electro-optic characteristics, a wide temperature range of a nematic phase and an excellent compatibility with other liquid crystal compounds, and a liquid crystal compounds especially having a wide temperature range of a nematic phase. A compound represented by formula (1). For example, R 1 and R 2 are each independently alkyl having 1 to 9 carbons or alkenyl having 2 to 9 carbons, alkoxy having 1 to 8 carbons or alkenyloxy having 2 to 8 carbons; Q 1 and Q 4 are each independently fluorine or chlorine; Q 2 and Q 3 are each independently hydrogen, fluorine or chlorine, and one of Q 2 and Q 3 is hydrogen; Z is -CH 2 O or -COO-; and h is 1 or 2.

The invention provides a method and a device for preparing ethylene glycol by hydrogenating dimethyl oxalate. A nickel-based catalyst is adopted to improve the upper limit temperature of a catalyst operation temperature window; meanwhile, multi-stage reaction is adopted, so that the amount of circulating hydrogen can be reduced, and the energy consumption of the circulating compressor is reduced;the device can adopt an adiabatic reactor, so that the equipment cost can be reduced.

The invention provides a liquid crystal compound having stability to heat, light and so forth, a wide temperature range of the nematic phase, a small viscosity, a suitable optical anisotropy, a suitable dielectric anisotropy and an excellent compatibility with other liquid crystal compounds. The invention also provides a liquid crystal composition containing this liquid crystal compound and a liquid crystal display device containing this liquid crystal composition. The compound is represented by formula (a). R a is, for example, alkyl having 1 to 10 carbons, and R b is, for example, alkenyl having 2 to 10 carbons; L a is, for example, hydrogen; and Z 1 , Z 2 and Z 3 are, for example, a single bond. The liquid crystal composition comprises this compound. The liquid crystal display device comprises this liquid crystal composition.

Provide a compound with large refractive index anisotropy, large dielectric constant anisotropy, and low melting point; and a compound with a wide temperature range of liquid crystal phase, large refractive index anisotropy, large dielectric constant A liquid crystal medium with constant anisotropy and an optically isotropic liquid crystal phase. The present invention is a liquid crystal compound having a chlorobenzene ring, and a liquid crystal medium characterized by containing the liquid crystal compound and a chiral agent and exhibiting an optically isotropic liquid crystal phase.