Method for preparing silica aerogel composite material by chlorine-free and alcohol-free process
A composite material and silicon dioxide technology, applied in applications, ceramic products, household appliances, etc., can solve the problems of increased cost and difficulty of anti-corrosion, achieve low thermal conductivity, increase safety, and improve the effect of application range
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Embodiment 1
[0046] A method for preparing a silica airgel composite material using a chlorine-free and alcohol-free process, comprising the following steps:
[0047] (1) Preparation of gel:
[0048] S1, take 500ml of water glass and add 800ml of water to dilute, stir evenly to obtain the aqueous solution of water glass; take 50ml of concentrated H 2 SO 4 The solution is diluted with 500ml of water to obtain diluted H 2 SO 4 solution, the aqueous solution of water glass was added to the diluted H 2 SO 4 In the solution, stir while adding, control the pH of the mixed solution at 3.0, then perform ion exchange resin desalination treatment on the mixed solution, add additives, and stir evenly to obtain the first mixed solution;
[0049] The addition amount of the additive is 1‰ of the weight of the silica airgel composite material, and the inorganic additive is iron oxide.
[0050] (2) Composite:
[0051] S2. Immerse the glass fiber material in the first mixed solution for a period of ...
Embodiment 2
[0063] A method for preparing a silica airgel composite material using a chlorine-free and alcohol-free process, comprising the following steps:
[0064] (1) Preparation of gel:
[0065] S1. Dilute the potassium silicate with water to obtain an aqueous solution of potassium silicate, wherein the volume ratio of potassium silicate to water is 1:5; 3 Add water to dilute, and add the aqueous solution of water-soluble silicon source to the diluted HNO 3 In the solution, the double-membrane method is used to pretreat and desalinate, and the inorganic additive is added and stirred evenly to obtain the first mixed solution; the added amount of the added inorganic additive is 1.5% of the weight of the silica airgel composite material, and the The inorganic additive is carbon black.
[0066] (2) dipping:
[0067] S2. Submerging the fiber reinforcement material in the first mixed solution, and standing and aging for 24 hours at 35° C. to obtain a composite gel, wherein the volume rat...
Embodiment 3
[0079] A method for preparing a silica airgel composite material using a chlorine-free and alcohol-free process, comprising the following steps:
[0080] (1) Preparation of gel:
[0081] S1. Dilute sodium metasilicate with water to obtain an aqueous solution of sodium metasilicate, wherein the volume ratio of sodium metasilicate to water is 1:3; 3 PO 4 Add water to dilute, and add the water-soluble silicon source aqueous solution to the diluted H 3 PO 4 In the solution, after freeze crystallization and desalination in an environment of 5°C, add inorganic additives and stir evenly to obtain the first mixed solution;
[0082] The amount of the added inorganic additive is 1% of the weight of the silica airgel composite material, and the inorganic additive is titanium dioxide.
[0083] (2) dipping:
[0084] S2. Immersing the fiber reinforced material in the first mixed solution, and standing in an environment of 70°C. Take out after the composite gel is formed.
[0085] (3)...
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