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Preparation method of silane microencapsulated solid powder waterproofing agent

A solid powder and microcapsule technology, applied in the field of building waterproofing, can solve the problems of unstable long-term effect and environmental pollution, and achieve the effect of improving the anti-carbonization ability, improving the resistance to chloride ion penetration, and reducing the entry of CO2

Inactive Publication Date: 2018-05-08
MAANSHAN TUORUI METAL SURFACE TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, because TEOS is volatile and easy to hydrolyze, its long-term effect is not stable when used directly in cement-based materials, and it will cause certain pollution to the environment

Method used

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Embodiment Construction

[0022] The present invention is achieved through the following technical solutions:

[0023] A preparation method of silane microcapsule solid powder water repellent, the specific steps are as follows:

[0024] (1) Preparation of wall material solution:

[0025] Mix 16 parts of polyvinylpyrrolidone, 40 parts of maltodextrin and 120 parts of water, stir and mix at a constant temperature of 260-320r / min in a water bath at 25°C, and ultrasonically disperse for 10 minutes at a power of 300W to make It completely dissolves to form a wall material solution;

[0026] (2) Preparation of silane emulsion:

[0027] Weigh 2 parts of sodium dodecylbenzenesulfonate and 2 parts of polyethylene glycol into distilled water, stir for 30 minutes to mix evenly, add 50 parts of isobutyltriethoxysilane monomer, and place at 35°C Stir in the water bath at constant temperature for 5 hours, keep the rotation speed at 25000r / min, after fully emulsifying, add 16 parts of TEOS, mix and stir for 5 hour...

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Abstract

The invention discloses a preparation method of silane microencapsulated solid powder waterproofing agent. According to the preparation method, by using hydrophilic polyvinylpyrrolidone and maltodextrin as a wall material, a silane monomer is wrapped in the wall material to form microencapsulated droplets through an emulsification and encapsulation technology, and a spray drying technology is adopted to obtain silane microencapsulated powder, so that the stability of TEOS (tetraethoxysilane) in use is effectively improved; when the TEOS is used for mixing of an aqueous solution of a waterproofcoating, the waterborne microencapsulated wall material can be rapidly dissolved into water to release a silane emulsion, and the silane emulsion is combined with the surface of a cement-based material to form a layer of reticular hydrophobic structure; and after the TEOS is hydrolyzed, formed polysilicic acid performs reaction with calcium hydroxide on the surface of concrete to form C-S-H gel as a secondary hydration product, so that pores of a concrete material are blocked, the surface compactness of the concrete is improved, entrance of CO2 and absorption of water are reduced to the maximum, and the water resistance ability and the carbonization resistance ability of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of building waterproofing, and in particular relates to a preparation method of a silane microcapsule solid powder waterproofing agent. Background technique [0002] The existence of water is the main factor causing damage to concrete structures, and controlling water intrusion is one of the main measures to improve the durability of concrete. At present, the method to prevent moisture from intruding into the concrete is mainly to carry out waterproof treatment on the surface of the concrete. Among many waterproof materials, silane can penetrate into the concrete to a certain depth and will not block the pores of the concrete. , has received extensive attention from researchers and engineers in recent years. However, the stability of silane monomer itself is not good enough, and it is easy to volatilize when exposed to the air, producing toxic gas, and there is also the possibility of self-polymerization, w...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/65
CPCC04B40/0046C04B2103/65C04B24/2652C04B24/38C04B24/42C04B24/28C04B24/16C04B40/0042C04B24/32
Inventor 芮明功
Owner MAANSHAN TUORUI METAL SURFACE TECH
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