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Nano-porous thermal insulation material and preparation method thereof

A heat insulation and nanoporous technology, applied in chemical instruments and methods, ceramic products, and other household appliances, can solve the problems of innovation in drying methods, achieve excellent mechanical properties and heat insulation performance, and the process is simple and feasible. The effect of low cost

Inactive Publication Date: 2020-03-20
上海稀点新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing nanoporous material preparation processes are all improvements to the sol preparation process of porous materials, and no innovations have been proposed in the drying method. Aiming at the problems existing in the above-mentioned processes, the present invention is based on long-term practical experience and rich professional knowledge. Knowledge is actively researched and innovated, and finally a method for preparing nanoporous materials with a porosity of more than 80% by high-temperature expansion is invented to solve the defects in the existing technology

Method used

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  • Nano-porous thermal insulation material and preparation method thereof
  • Nano-porous thermal insulation material and preparation method thereof
  • Nano-porous thermal insulation material and preparation method thereof

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preparation example Construction

[0045] Regarding the preparation of the preform, in one embodiment, the water-soluble silicate is dissolved in water and directly mixed to obtain the preform. In another embodiment, the preparation of the preform may include the following two steps: (1) first dissolve the water-soluble silicate with excess water to obtain a mixed solution. (2) Then, the water in the obtained mixed solution was reduced. Mixing can be performed using a mixing device such as a mixer or a stirrer. It is also possible to mix the water-soluble silicate, curing agent and water mechanically under heated conditions. Mixing can be achieved by using equipment with high temperature functions such as internal mixers, open mills, high temperature kneaders, double cone extruders, twin screw extruders, twin roll presses and the like. Large doses of water can dissolve water-soluble silicates quickly and evenly.

[0046] It should be understood that, in the above-mentioned technical scheme or subsequent tech...

Embodiment 1

[0084] Take by weighing 100g water glass (water glass refers to sodium silicate solution, sodium silicate solid content is 42%, the same below), the sample is put into conical twin-screw extruder, under the condition of temperature 110 ℃, rotating speed 60r / min, Sample water content is reduced to 20wt% (referring to the quality of water accounts for the ratio of raw material gross mass, the same below), the water glass after drying is as follows figure 1 mentioned. The dried sample is taken out and made into a thickness of 2mm and a volume of 1.1cm 3 Place it in the release paper (the function of placing in the release paper is to prevent the sample from sticking to the equipment). Turn on the double-roller press, set the temperature to 230°C, the speed to 4m / min, and the gap between the rollers to 1.5mm. After reaching the set temperature, put the sheet into the rollers for puffing. Put it into a double-roller hot press and carry out high-temperature expansion for about 1 m...

Embodiment 2

[0090] The difference from previous Example 1 is that in the aforementioned 1st step, 100g water glass is weighed in the container, and 30% (this ratio refers to the ratio of curing agent aluminum phosphate quality to water glass quality, the same below) is added simultaneously. Aluminum phosphate (powder) to prepare porous material. Sample is put into conical twin-screw extruder, under temperature 110 ℃, rotating speed 60r / min condition, moisture content is reduced to 20wt%, the aluminum phosphate water glass after drying is as image 3 mentioned. Turn on the double-roller press, set the temperature at 230°C, the speed at 4m / min, and the gap between the rollers at 1.5mm. Figure 4 shown. Before the material enters the double-roller heat press and leaves the double-roller heat press, the thickness changes from 2mm to 4mm, and the volume changes from 0.9cm 3 becomes 6.4cm 3 .

[0091] According to the above method, the density of the material prepared in this example is ρ=...

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Abstract

The invention discloses a nano-porous thermal insulation material and a preparation method thereof. The preparation method comprises the following steps: dissolving raw materials for preparing inorganic hydrosol in water to form a prefabricated body with the water content of 5-40wt%; wherein the inorganic hydrosol comprises at least one of silicon dioxide sol, titanium dioxide sol, aluminum oxidesol and zinc oxide sol; heating the prefabricated body to vaporize water and keep the form to be basically unchanged; and expanding to increase the volume of the material until a required porosity isachieved, thereby obtaining the thermal insulation material with a nano-porous skeleton structure.

Description

technical field [0001] The invention belongs to the field of heat insulation material processing and application, and mainly relates to a heat insulation material with a nanoporous structure and a preparation method thereof. Background technique [0002] Existing thermal insulation materials are generally a special gel that uses gas instead of liquid in the gel without substantially changing the network structure or volume of the gel itself, and is the product of hydrogel or organic gel after drying. It has the characteristics of nanoscale porous structure and high porosity, and is one of the solid materials with low density known so far. This type of insulation material was first prepared by Professor Kistler in the 1930s. Because its preparation process is loaded down with trivial details and lengthy, the shortcoming such as expensive and brittle, has not attracted attention for a long time. Since the 1970s, with the rapid development of sol-gel technology, inorganic the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C01B33/141C01F7/02C01G9/02C01G23/047C04B111/40
CPCC04B38/0045C04B38/0054C01B33/141C01F7/021C01G23/08C01G9/02C04B2111/40
Inventor 刘爱林
Owner 上海稀点新材料科技有限公司
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