45results about How to "Wide phase transition temperature range" patented technology

The invention provides a composite phase-change thermal storage material. A porous material with high thermal conductivity is used as a supporting framework, and low-melting-point metal or low-melting-point metal with nano-particles is distributed in pores of the porous material, wherein melting point or solidus temperature of the low-melting-point metal is less than or equal to 80 DEG C; and thermal conductivity of the porous material is within 40-400 W/(m.K). The material provided by the invention has high equivalent thermal conductivity and high storage energy density; there is a large contact area between the liquid metal and the porous material; and the material has a wide application temperature range, has good fixability, stable physico-chemical property and good reversibility; and the problem of decreasing heat storage efficiency after multiple times of heat adsorption and release cycles is avoided.

The invention discloses a liquid crystal composition, comprising a first variety of compound shown as a general formula I, a second variety of compound shown as a general formula II, a third variety of compound shown as a general formula III and a fourth variety of compound shown as a general formula IV; the invention also provides a liquid crystal lens employing the liquid crystal composition. The liquid crystal composition of the present invention has characteristics of low nematic phase initial voltage, wide phase transition temperature scope, small viscoelastic coefficient ratio gamma 1/K11, large optical anisotropy and large dielectric anisotropy, etc., and can reduce a thickness value of a liquid crystal lens box and increase response speed of the liquid crystal lens box.

The invention provides a liquid crystal composition for TFT (Thin-Film Transistor) display. The liquid crystal composition is prepared from the following components in percentage by weight: 1-40 percent of I-type compound, 1-70 percent of II-type compound, 1-40 percent of III-type compound, 0-45 percent of IV-type compound and 0-20 percent of V-type compound. The liquid crystal composition has excellent performance, extremely low total response time (ttot=ton+toff), lower voltage, high resistance ratio and voltage retention ratio, and can also have different threshold voltages, clearing points and delta n characteristics by adjusting the contents of the components, thereby being particularly suitable for manufacturing rapid-response TN-TFT liquid crystal displays.

The invention relates to an organic phase change thermal storage material and a production method thereof. The method comprises the following steps: preparing organic phase change material emulsion, preparing an organic phase change thermal storage material and the like. According to the method, the problems of dispersion and compatibility of the organic phase change material in ardealite are effectively solved, the prepared ardealite composite phase change energy storage material is stable in performance, the organic phase change material difficultly diffuses, and the adopted technical scheme is simple in steps and easy to implement. The technology can be widely applied to a process of compounding gypsum materials and organic phase change materials and has good application prospects.

The invention discloses a preparation method for phase-M vanadium dioxide nanometre powder. The preparation method comprises the following steps: mixing polyhydric alcohol with a carbon chain length of 3 to 10 with monohydric alcohol with a carbon chain length of 1 to 5 in a volume ratio of 1: (6 to 15), so as to obtain a mixed alcohol solution; then adding quaternary ammonium salt with a carbon chain length of 1 to 16 in the mixed alcohol solution, so as to obtain electrolyte, wherein the concentration of quaternary ammonium salt in the electrolyte is 1-5 g/L; then using a vanadium metal block as an anode, using a platinum metal block or a vanadium metal block as a cathode, keeping a distance between the anode and the cathode to be 2 mm to 5 cm, placing the anode and the cathode in the electrolyte, and electrolysing for 1 to 3 hours under a voltage of 2 to 30 V, so as to obtain a reaction solution containing precipitates; then performing a solid-liquid treatment and a washing treatment on the reaction solution, so as to obtain an intermediate product; and after that, annealing the intermediate product for 1 to 3 hours at a temperature of 350 to 450 DEG C and under a pressure of 10 to 100 Pa, so as to prepare the target product with a particle size of 50 to 100 nm. The preparation method has the characteristics of being time-saving, energy-saving, environment-friendly, low in preparation cost, and easy to realize large-scale industrialized production.

A phase change energy storage material prepared from oleic acid or esters of the energy storage material is characterized in that the general molecular formula of the material is CH3(CH2)7CHOH-CHOH(CH2)7COOR, wherein R is H, CH3 or CH2CH3. The material belongs to the compound of fatty acid derivatives and has phase change temperature between 35 DEG C and 130 DEG C and phase change latent heat of 110-206kJ/kg. The material has the advantages of controllable phase change temperature and wider range of phase change temperature.

The invention discloses a liquid crystal composition. The liquid crystal composition has a wide phase transition temperature scope, high resistance, high stability, high double refraction anisotropy and rapid response and good high- and low-temperature stability, can still produce fast response at a low temperature of 0-30 DEG C and is especially suitable for industrial control instruments and vehicle-carried TNTFT-LCD. The liquid crystal composition comprises 1-20wt% of a compound I, 1-50wt% of a compound II, 1-30wt% of a compound III, 1-50wt% of a compound IV, 1-20wt% of a compound V and 0.05-0.5wt% of an optical rotation component.

The invention relates to a thermal diffusion method for manufacturing a nitinol with wide temperature phase transition, pertaining to the filed of metallic functional materials. The invention is characterized in that the composition range of the nitinol with wide temperature phase transition is: Ni50.5-Ti to Ni52-Ti, and the manufacturing method comprises: (1) the nitinol with wide temperature phase transition is obtained by adopting a plurality of short-term heating and quenching; (2) the heating temperature for the quenching of the nitinol with wide temperature phase transition ranges from 300-900 DEG C; (3) the heating time for the quenching of the nitinol with wide temperature phase transition is 1-600s; (4) the treatment times for the quenching of the nitinol with wide temperature phase transition are 1-30. From the beginning of the phase transition to the end of the phase transition Ms-Mf, the temperature range is more than 50 DEG C. The temperature range of the martensitic phase transformation of the invention is wide, high damping temperature range is wide, good damping effect is performed under poor strain condition; the austenite phase always kept in the interior of the nitinol can ensure good hyperelasticity, thus leading an oscillating damper to have tightening effect to improve the damping effect; the thermal diffusion method requires simple equipment and is easily operated.

The invention belongs to the technical field of aluminum-based copper-clad plates, and particularly relates to an EB curing copper-clad aluminum-based plate heat dissipation coating which comprises the following components in parts by weight: 20-30 parts of acrylic resin, 10-20 parts of active monomers, 30-60 parts of phase change capsules, 0.1-0.5 part of a flatting agent, 0.1-0.5 part of a dispersing agent, 0.1-0.5 part of a defoaming agent, 5-10 parts of absolute ethyl alcohol and 10-20 parts of modified inorganic powder. According to the EB curing copper-clad aluminum substrate heat dissipation coating, the phase change capsule is added, heat dissipated by an aluminum-based copper-clad plate can be rapidly absorbed and further dissipated through the surface of the coating, and the phase change capsule is obtained by coating an organic phase change material with an organic matter and has good compatibility with a coating system; and the transparency of the coating and the original texture and texture of the material are not influenced while the heat dissipation effect is improved, excessive solvents do not need to be added, and the method is more environment-friendly.

The invention provides a flame-retardant phase change material, which is prepared from the following raw materials in parts by mass: 1 to 90 parts by weight of polyhydric alcohol, 1 to 90 parts by weight of resin, 1 to 10 parts by weight of solid porous material, 0.1 to 7 parts by weight of flame retardant, 0.1 to 5 parts by weight of heat conduction agent and 0.01 to 2 parts by weight of coupling agent and/or curing agent. The temperature-control heat-conduction phase-change material is obtained by taking polyhydric alcohol and the like as a phase-change agent, taking resin as a support body of the phase-change material, taking a solid porous material as an auxiliary setting agent, combining with a specific heat-conduction agent and a flame retardant, uniformly mixing the phase-change agent, the support body, the auxiliary setting agent, the heat-conduction agent and the flame retardant, and polymerizing or curing. The solid-solid phase change composite material provided by the invention is wide in phase change temperature range, large in phase change latent heat and adjustable in phase change temperature and phase change latent heat, does not need complex use devices and packaging containers with good sealing performance, and is wider in application occasion and lower in system cost.