Stone protective film nanometer material and preparation method thereof

A technology of nanomaterials and protective films, applied in the field of nanomaterials, to achieve the effects of mild reaction conditions, low cost, and simple steps

Inactive Publication Date: 2012-03-28
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic protective film materials have been used for surface protection of stone cultural relics for more than 40 years, but the protective effect is still unsatisfactory
The main problems are as follows: (1) The actual effective life of organic polymer protective materials outdoors is generally only a few years, up to 20 or 30 years, while the life expectancy of stone cultural relics is much longer
However, the difficulty of using this method to prepare thin film materials lies in the selection and coordination of components such as inorganic precursors, surfactants, organic monomers, and organic solvents. At present, the self-assembly method (EISA) has not been successful in preparing nano-film materials for stone protection. instance report

Method used

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  • Stone protective film nanometer material and preparation method thereof
  • Stone protective film nanometer material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of silica sol: Mix and stir 0.5-2 parts by mass of tetraethyl orthosilicate (TEOS) and 0.3-1 parts by mass of absolute ethanol; slowly add 2-10 parts by mass of deionized water and ethanol solution of hydrochloric acid, wherein The concentration of hydrochloric acid is 37wt% commercially available concentrated hydrochloric acid, the mass ratio of deionized water, hydrochloric acid and ethanol is 1:0.001~0.01:0.3~0.8; stir for 0.3~0.7 h to make it evenly mixed, at 20~40℃ Aged in an oven to obtain a uniform silica sol.

Embodiment 2

[0037] Example 2 Monodisperse SiO 2 Colloidal sphere preparation:

[0038] 1. Dissolve 8~15ml TEOS in 80~130ml absolute ethanol to obtain liquid A;

[0039] 2. Dissolve 15~45 ml concentrated ammonia water (25 wt %) in 100~200 ml absolute ethanol to obtain liquid B;

[0040] 3. In a constant temperature water bath at 35~45°C, slowly drop liquid A into liquid B under stirring conditions, stir and react for 10 hours after the addition is complete, and centrifuge and wash with absolute ethanol three times after the reaction, and finally the precipitate obtained Soak in hydrogen peroxide (30 wt %) for 35-50 h at 25-40 °C, and then centrifuge to obtain SiO with different particle sizes (30-300 nm). 2 Colloidal sphere particles.

[0041] The reagents required in this example are all analytically pure or chemically pure without purification treatment, and the water used is secondary deionized water.

Embodiment 3

[0042] Example 3 Preparation of 1# protective film material: Add 75 parts by mass of commercially available silica sol, 25 parts by mass of PDMS-PEO and 35 parts by volume of absolute ethanol into a round bottom flask, wherein the unit correspondence between the reaction raw materials and the solvent It is: g corresponds to ml or kg corresponds to L, and so on (the following examples are the same); magnetically stir at room temperature for 2 to 4 hours. The hybrid silica sol is painted or sprayed on the stone, and the solvent is slowly volatilized under natural environmental conditions, thereby forming a colorless and transparent stone cultural relic protective film material. After the material is fully gelled, its basic characteristic parameters are as follows: viscosity (25°C) 1.3 mPa.s, specific surface area 256.4 m 2 / g, pore volume 0.155 cm 3 / g, pore size 2.1 nm.

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Abstract

The invention relates to a stone protective film nanometer material; a preparation method of the stone protective film nanometer material comprises the following steps of: adding silica solution used as a matrix, monodisperse SiO2 colloidal spheres and a polydimethylsiloxane-polyoxyethylene (PDMS-PEO) two-block copolymer used as modifiers to a solvent, and preparing the stone protective film nanometer material by adopting a solvent evaporation induced self-assembly (EISA) method; and the bore diameter of the stone protective film nanometer material is 2.0-5.5nm. The stone protective film nanometer material has good adhesion to stone relics and a series of excellent performances such as waterproofness, hydrophobic property, weather resistance, recoatability and the like; the stone protective film nanometer material can resist acid rains, does not hinder the evaporation of water vapor in stones and avoids the adverse effect caused by completely closing porous channels of the stones; andthe hydrophily and the hydrophobicity of the surface of the protective film can be changed according to the need so as to adapt to different climatic environments. Meanwhile, the preparation method of the stone protective film nanometer material has the advantages of simple steps, mild reaction conditions, low cost, suitability for industrial scale production and very good application prospect.

Description

technical field [0001] The invention relates to a nano material, in particular to a stone protective film material and a preparation method thereof. Background technique [0002] my country has a large number of precious stone cultural relics resources, such as grottoes, stone carvings, steles, stone Buddhas, etc., most of which are exposed to nature and have undergone serious weathering, especially the environmental pollution caused by the development of modern industrialization has accelerated The weathering and corrosion of these precious stone cultural relics, therefore, actively taking protective measures is an urgent task in the current cultural relics protection work. [0003] The most commonly used method for the protection of stone cultural relics is to use various protective materials on the surface of stone cultural relics to prevent weathering and corrosion. These protective materials can play the following roles: reinforcement, waterproof, anti-acid, anti-foul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/12C04B41/50
Inventor 刘玉荣
Owner CHONGQING UNIV OF ARTS & SCI
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