A method for preparing hollow calcium silicate thermal insulation material by using yam starch

A technology of yam starch and thermal insulation material, which is applied in the direction of silicate, alkaline earth metal silicate, application, etc., can solve the problems of difficult dispersion, easy flocculation, and inability to be recycled multiple times, and achieves the advantages of easy operation and improved thermal insulation performance Effect

Active Publication Date: 2018-06-19
广东御天正康生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: In view of the problems that calcium silicate is difficult to disperse, easy to flocculate, and unable to be recycled many times in the process of preparation as a common high-strength thermal insulation material on the market, it provides a method using yam A method for preparing hollow calcium silicate thermal insulation materials from starch. The method uses yam as a raw material, and centrifuges to obtain yam starch after grinding and enzymatic hydrolysis. Starch is used as the main body of the template, and the principle of calcium chloride and sodium silicate deposition in an aqueous medium is used. , synthesize calcium silicate precipitation in situ on the starch surface, and then remove the template by ablation, and finally make a hollow calcium silicate insulation material. The hydroxyl groups produce chemical bonds and are evenly arranged on the surface of the starch, which reduces the van der Waals force between calcium silicate crystals and effectively solves the problems of difficult dispersion and easy flocculation in the traditional preparation of calcium silicate. At the same time, the hollow space obtained after ablation of the template Calcium silicate, using the characteristics of air insulation, further improves the insulation performance of the material, and has broad application prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] First weigh 2kg of yam with deionized water to rinse the surface impurities, peel and cut into small pieces with a side length of 1cm, put the obtained small pieces into a stone mortar and manually mash them with a stone pestle, and then mash them The Chinese yam is transferred in the ball mill, is 30:1 to add stainless steel ball milling beads in the ball mill tank by the ball-to-material ratio, grinds 1h, discharges and obtains Chinese yam powder; Then by solid-liquid ratio is 1:3 the Chinese yam powder and distilled water obtained above Put them together in a ceramic fermenter, stir and mix them with a magnetic stirrer at a speed of 400r / min for 20min to obtain a yam powder suspension and move it into a ceramic fermenter, add 0.5% of the total mass of yam powder alkaline protease, and use a concentration of 0.5mol / L sodium hydroxide solution to adjust the pH to 9.0, and put it in a 45°C incubator for 5 hours to insulate for enzymolysis; Move the filtrate into a hori...

example 2

[0022]First weigh 2.5kg of yam with deionized water to rinse the surface impurities, peel and cut into small pieces with a side length of 1.5cm, put the obtained small pieces into a stone mortar and manually mash them with a stone pestle, and then pound them The crushed yam is transferred to the ball mill, and the ball-to-material ratio is 30:1 to add stainless steel ball milling beads to the ball mill tank, grind for 1.5h, and discharge to obtain yam powder; Powder and distilled water are put into ceramic fermenter together, stir and mix 25min with 450r / min rotating speed with magnetic mixer to obtain yam powder suspension and move it into ceramic fermenter, add the alkaline protease of 0.65% of yam powder gross mass, with concentration Adjust the pH to 9.5 for a 0.5mol / L sodium hydroxide solution, put it in a 48°C incubator and incubate the enzymolysis for 6 hours; after the enzymolysis is complete, pass the enzymolysis product through a 200-mesh standard sieve, separate and ...

example 3

[0025] First weigh 3kg of Chinese yam with deionized water to rinse off the surface impurities, peel and cut into small pieces with a side length of 2cm, put the obtained small pieces into a stone mortar and manually mash them with a stone pestle, and then mash them The Chinese yam is transferred in the ball mill, is 30:1 to add stainless steel ball milling beads in the ball mill jar by ball-to-material ratio, grinds 2h, and discharging obtains Chinese yam powder; Then is 1:3 by the solid-liquid ratio that above-mentioned Chinese yam powder and distilled water are mixed Put them together in a ceramic fermenter, stir and mix with a magnetic stirrer at a speed of 500r / min for 30min to obtain a yam powder suspension and move it into a ceramic fermenter, add 0.8% of the total mass of yam powder alkaline protease, and use a concentration of 0.5mol / L sodium hydroxide solution to adjust the pH to 10.0, put it in a thermostat at 50°C for 7 hours for enzymolysis; Move the filtrate int...

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Abstract

The invention discloses a method for preparing a hollow calcium silicate thermal insulation material from rhizoma dioscoreae starch, and belongs to the technical field of preparing a thermal insulation material. According to the method, rhizoma dioscoreae is taken as a raw material and subjected to grinding, enzymolysis and centrifugation to prepare rhizoma dioscoreae starch; the starch is taken as a template main body, and according to the principle that calcium chloride and sodium silicate are precipitated in a water media, a calcium silicate precipitation is synthesized on the surface of starch in situ; and the template is removed through ablation to finally prepare the hollow calcium silicate thermal insulation material. The polyhydroxy characteristic of rhizoma dioscoreae starch is utilized, so that chemical bonds are formed between calcium silicate crystals obtained from precipitation and hydroxyl groups located on the surface of starch, and the calcium silicate crystals are uniformly dispersed on the surface of starch. The Van der Waals' force between the calcium silicate crystals is reduced, thereby solving the problem that calcium silicate is hard to disperse and prone to flocculate in a conventional preparation process of calcium silicate. After the template is ablated, hollow calcium silicate is obtained. Since air has the thermal insulation characteristic, the thermal insulation performance of the material is further improved. The hollow calcium silicate thermal insulation material has bright application prospects.

Description

technical field [0001] The invention discloses a method for preparing a hollow calcium silicate heat insulating material by using yam starch, and belongs to the technical field of heat insulating material preparation. Background technique [0002] Thermal insulation refers to a material or combination of materials that has a significant resistance to heat flow. Traditional thermal insulation materials, such as glass fiber, asbestos, rock wool, silicate, etc., new thermal insulation materials, such as airgel felt, vacuum panels, etc. They are used in building envelopes or thermal equipment, materials or material composites that resist heat flow transfer, including thermal insulation materials and cold insulation materials. Thermal insulation materials are an important component of energy development and conservation projects, and are closely related to ecology, environmental protection and sustainable development. On the one hand, it satisfies the thermal environment of bui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/24C04B38/08C04B35/16
CPCC01B33/24C01P2004/30C04B35/16C04B38/08C04B2235/3454
Inventor 姚少锋
Owner 广东御天正康生物科技有限公司
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