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488results about How to "Low thermal conductivity" patented technology

Modified vitrification micro-bead thermal insulation mortar and preparation method thereof

The invention discloses a modified vitrified micro bubbles thermal insulation mortar and a preparation method thereof. The steps of the preparation method are as follows: (1) modifying low quality vitrified micro bubbles: organic silicon hydrophobic agent is diluted by water, and the volume ratio between the hydrophobic agent and the water is 1: 10-1: 80 and the diluted hydrophobic agent is sprayed uniformly on the low quality vitrified micro bubbles; (2) drying: the vitrified micro bubbles treated by the hydrophobic agent is put into an oven for drying; (3) compounding the thermal insulation mortar: the master batch of the mortar and the modified vitrified micro bubbles are stirred uniformly according to the weight ratio 1:2-2:1, thus obtaining the modified vitrified micro bubbles thermal insulation mortar. The method can not only decrease the water absorption of the low quality vitrified micro bubbles but can also keep certain water-retaining rate; furthermore, the method also can decrease the thermal conductivity of the thermal insulation mortar and has simple production technique and obvious effect. The thermal conductivity of the thermal insulation mortar made by low quality vitrified micro bubbles not only meets the national quality standards, but also greatly reduces cost, thus being more easily to be popularized.
Owner:SOUTH CHINA UNIV OF TECH

Vehicle composite friction material containing potassium titanate whisker and preparation method thereof

InactiveCN101200551ALow thermal conductivitySlow down energy transferToxinPhenol formaldehyde resin
The present invention discloses vehicle composite friction material with potassium titanate crystal whisker and the preparation method. In terms of weight percentage, the composite friction material includes the following components: 10 to 50 percent of cashew oil modified phenol formaldehyde resin, 3 to 8 percent of NBR, 10 to 20 percent of crystal potassium titanate, 3 to 8 percent of squamose potassium titanate, 3 to 8 percent of vermiculite, 1 to 3 percent of aramid fiber, 3 to 8 percent of meerschaum fiber, etc. In preparation, the composite friction material is made into prepare material according to the proportion, the prepare material is evenly mixed and poured into a die for pressing and molding, and then the pressed finished product is taken out; the pressed finished product is put into a constant-temperature box and processed for 8 to 24 hours under the temperature of 145 to 165 DEG C, thus finally obtaining the vehicle composite friction material with potassium titanate crystal whisker. The prepared material has stable chemical performance and no toxin and harm; the potassium titanate powder produced by the friction of crystal whisker in braking process will rapidly settle down on the ground, thus preventing the body hurt and air pollution.
Owner:SOUTH CHINA UNIV OF TECH

Preparation method of fiber reinforced phosphate high-temperature-resistant composite material

The invention relates to a preparation method of a fiber reinforced phosphate high-temperature-resistant composite material. The preparation method comprises the following steps of: (1) preparing a fiber preform; (2) pretreating the fiber preform; (3) soaking or coating the fiber preform, and curing the fiber preform: putting the fiber preform into a soaking tank, sucking a phosphate solution in vacuum until a fabric is submerged, soaking the fabric for more than or equal to 10 minutes, heating to 50-500 DEG C, and preserving the heat for 1-60 hours; or soaking or coating the fiber preform by using an aluminum, zirconium or magnesium inorganic salt solution, heating to more than or equal to 500 DEG C, preserving the heat for more than or equal to 2 hours, sucking a phosphoric acid solution in vacuum until the fabric is submerged, soaking the fabric for more than or equal to 10 minutes, heating to more than or equal to 500 DEG C, and preserving the heat for more than or equal to 2 hours; and (4) performing high-temperature treatment to obtain the fiber reinforced phosphate high-temperature-resistant composite material. The composite material prepared by the method can be widely used in high-temperature resistance, bearing, wave transmitting, corrosion resistance and the like.
Owner:NAT UNIV OF DEFENSE TECH

Foam microcrystalline glass and preparation method thereof

The invention discloses foam microcrystalline glass. The foam microcrystalline glass is prepared by taking liquid-state red-heat steel slag as a main raw material and adding auxiliary raw materials including a certain quantity of mineral raw materials, a few quantities of chemical materials and the like. The preparation method comprises the following steps of: firstly, performing slag ladle precipitation on the liquid-state red-heat steel slag to remove steel to obtain iron-free liquid-state red-heat steel slag, adding the iron-free liquid-state red-heat steel slag and the mixed auxiliary raw materials into a stirring pond, and uniformly stirring the steel slag, the auxiliary raw materials and air bubbles generated by reacting the steel slag and the auxiliary raw materials by a group of rotary stirrers in the stirring pond, thus forming foam glass; secondly, forming the foam glass at 1,000-1,250 DEG C to prepare a foam glass blank; thirdly, feeding the foam glass blank into a heat preserving furnace, crystallizing and annealing the foam glass in a cooling process along with the furnace, and converting the foam glass into a foam microcrystalline glass blank; and fourthly, processing the foam microcrystalline glass blank to be in the required size of the product. The preparation method is energy-saving and environment-friendly, and additional energy sources do not need to be supplemented.
Owner:北京盛康宁科技开发有限公司

Hybrid high-efficiency thermal-insulation material and preparation method thereof

The invention relates to a hybrid high-efficiency thermal-insulation material and a preparation method thereof. The preparation method comprises the following steps: by using a pretreated light-weight porous material as aggregate, an inorganic active material as an initiator, reactive polymer powder and white cement as gelling materials and ash calcium and gypsum powder as propping materials, mixing with fibers, a water repellent, cellulose ether, a surfactant and the like, stirring and dispersing to obtain the hybrid high-efficiency thermal-insulation material. The hybrid high-efficiency thermal-insulation material is composed of the following components in parts by weight: 20-40 parts of aggregate, 10-15 parts of inorganic active material, 5-10 parts of reactive polymer powder, 20-35 parts of white cement, 15-20 parts of propping material, 5-15 parts of fiber, 1-5 parts of water repellent, 0.1-0.5 part of cellulose ether and 0.5-1 part of surfactant. A right amount of water can be added into the material and stirred to obtain a paste, and the paste is directly spread onto the basal plane of the wall. The product has the advantages of low heat conductivity coefficient, high compression strength, favorable binding strength, thermal insulation, water resistance, fire resistance, crack resistance, no toxicity, environment friendliness, low shrinkage, simple construction technique, low unit area cost and the like, and is suitable for thermal insulation of various building external walls.
Owner:JIANGXI ZHONGKEXIN NEW BUILDING MATERIALS
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