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A kind of preparation method of self-dispersing micron-scale hydrophobic powder
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A micron-scale, self-dispersing technology, applied in the field of construction, can solve the problems of weak bonding between hydrophobic groups and powder, affecting materials, hydrophobic effect of products, and large particle size of hydrophobic powder, achieving controllable hydrophobic effect and cost. Low, easy production and operation effect
Active Publication Date: 2022-04-19
FIRST NEW MATERIAL TECH DEV +1
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However, the above method has the following problems: most of the hydrophobic groups carried by the powder of the former are physically adsorbed on the powder, the combination of the hydrophobic groups and the powder is not firm, the loading rate is low and it is not easy to disperse; the hydrophobic groups prepared by the latter Water powder usually has a large particle size and is not easy to disperse in the material, which affects the hydrophobic effect of materials and products
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Embodiment 1
[0020] A preparation method of self-dispersing micron-scale hydrophobic powder, which comprises the following preparation steps:
[0021] Weigh 96g of water, add 3g of polyvinylpyrrolidone under stirring, mix and dissolve thoroughly, then add 1g of hydroxyacrylic acid emulsion, and use AMP-95 to adjust the pH of the system to 8-9 to obtain a precursor solution.
[0022] Weigh 30g of methyltrimethoxysilane and add it to the precursor solution of (1), add dropwise 20g of methyltrimethoxysilane and 20g of dodecyltrimethoxysilane mixture within 1h under stirring, and continue the reaction for 20min to obtain Viscous white emulsion.
[0023] Add 2g of methoxy(dimethyl)octylsilane to the above emulsion, adjust the pH of the system to 9-10, let it stand until a gel is formed, put it in an oven and dry it to obtain a micron-sized powdery hydrophobic powder.
[0024] The above-mentioned micron-sized powdery hydrophobic powder prepared as figure 1 and figure 2 As shown, the hydropho...
Embodiment 2
[0026] A preparation method of self-dispersing micron-scale hydrophobic powder, which comprises the following preparation steps:
[0027] Weigh 84g of water, add 15g of 2-acrylamido-2-methylpropanesulfonic acid polymer solution (20wt%) under stirring, fully mix and dissolve, then add 1g of hydroxyacrylic acid emulsion, and use 10% NaOH solution to adjust the pH of the system To 8-9, the precursor solution is obtained.
[0028] Weigh 30g of methyltrimethoxysilane and add it into the precursor solution of (1), add dropwise 20g of methyltrimethoxysilane and 20g of octadecyltrimethoxysilane mixture within 1h under stirring, and continue to react for 20min to obtain Viscous white emulsion.
[0029] Add 1 g of trimethylmethoxysilane to the above emulsion, adjust the pH of the system to 9-10, let it stand until a gel is formed, put it in an oven and dry it to obtain a micron-sized powdery hydrophobic powder.
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Abstract
A method for preparing self-dispersing micron-sized hydrophobic powder, which includes the following steps: adding a low-molecular-weight water-soluble polymer and a hydroxyacrylic acid emulsion into water, adding organosiloxane in proportion, reacting to prepare a viscous white emulsion, adding a sealant Terminal agent, adjust the pH to form a gel, and then obtain a micron-sized powdery hydrophobic powder after drying. The wet gel is obtained through siloxane polycondensation and dispersion polymerization. After drying, micron-sized spherical hydrophobic powder can be obtained without mechanical crushing. It has low cost, easy production and operation, controllable hydrophobic effect of powder, and wide adaptability to application scenarios, etc. features.
Description
technical field [0001] The invention relates to a preparation method of self-dispersing micron-sized hydrophobic powder used in the construction field. Background technique [0002] The anti-seepage and waterproof in construction engineering has always been a concern. In the aspect of anti-seepage and waterproof of houses, bridges and other concrete buildings, various waterproof agents and waterproof emulsion additives have been developed. Liquid waterproofing agent is inconvenient to transport and is usually applied on the surface of the substrate, which has poor durability and limited application range. Hydrophobic powder, as a kind of waterproofing agent, can be used in cement and dry mix mortar powder materials. Adding a small amount can play a waterproof and anti-seepage effect, and at the same time, it has a certain anti-alkali effect. [0003] At present, the preparation methods of hydrophobic powder are mainly divided into two ways: loading or modifying by adding su...
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