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Preparation method of waterproof agent

A technology of waterproofing agent and preparation steps, which is applied in the field of preparation of waterproofing agent, which can solve the problems of high price, inapplicability to high-rise buildings, and poor durability, and achieve the effects of cheap raw materials, improved emulsification performance, and simple process

Pending Publication Date: 2020-04-24
广州国色生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main technical problem to be solved by the present invention is to provide a preparation method of a waterproofing agent in view of the serious corrosion of concrete by water and the use of silicone waterproofing agents, which are expensive and have poor durability and cannot be applied to high-rise buildings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of gelatinized grafted starch:

[0034] In terms of parts by weight, 80 parts of corn starch emulsion with a mass fraction of 20% and 7 parts of sodium chloride were added to a three-necked flask, placed in a water bath, heated to 45°C, and then the mass fraction was 5% hydrogen After the sodium oxide solution adjusts the pH to 10.0, add 40 parts of epichlorohydrin dropwise to the flask. After the dropwise addition, keep stirring and react for 3 hours, then use 10% hydrochloric acid to adjust the pH to 6.0, filter and separate, and collect the filter cake. Obtain pretreated starch after washing with absolute ethanol;

[0035] In parts by weight, take 20 parts of the above-mentioned pretreated starch and add it to a three-neck flask filled with 400 parts of water, place the flask in an oil bath, heat up to 95°C, keep warm and gelatinize for 30 minutes to obtain a gelatinized product, and cool down After reaching room temperature, add 1 part of ammonium persu...

Embodiment 2

[0043] Preparation of gelatinized grafted starch:

[0044] In terms of parts by weight, 90 parts of cornstarch emulsion with a mass fraction of 20% and 7 parts of sodium chloride were added to a three-necked flask, placed in a water bath, heated to 47°C, and then the mass fraction was 5% hydrogen After the sodium oxide solution adjusts the pH to 10.2, add 45 parts of epichlorohydrin dropwise to the flask. After the dropwise addition, keep stirring and react for 3.5 hours, then use 10% hydrochloric acid to adjust the pH to 6.1, filter and separate, and collect the filter cake , to obtain pretreated starch after washing with absolute ethanol;

[0045] In parts by weight, take 25 parts of the above-mentioned pretreated starch and add it to a three-necked flask filled with 450 parts of water, place the flask in an oil bath, heat up to 97°C, keep warm and gelatinize for 35 minutes to obtain a gelatinized product, and cool down After reaching normal temperature, add 2 parts of ammo...

Embodiment 3

[0053] Preparation of gelatinized grafted starch:

[0054] In terms of parts by weight, add 100 parts of cornstarch emulsion with a mass fraction of 20% and 8 parts of sodium chloride into a three-necked flask, place it in a water bath, heat up to 50°C, and then use a mass fraction of 5% hydrogen After the sodium oxide solution adjusts the pH to 10.5, add 50 parts of epichlorohydrin dropwise to the flask. After the dropwise addition, keep stirring and react for 4 hours, then use 10% hydrochloric acid to adjust the pH to 6.2, filter and separate, and collect the filter cake. Obtain pretreated starch after washing with absolute ethanol;

[0055] In parts by weight, take 30 parts of the above-mentioned pretreated starch and add it to a three-necked flask filled with 500 parts of water, place the flask in an oil bath, heat up to 100°C, keep warm and gelatinize for 40 minutes to obtain a gelatinized product, and cool down After reaching normal temperature, add 3 parts of ammonium ...

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PUM

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Abstract

The invention discloses a preparation method of a waterproof agent, and belongs to the technical field of building waterproofing. A soap-free emulsion method is adopted in the process of preparing anacrylic emulsion; the water resistance and the cohesiveness of the waterproof agent are improved; corn starch reacts with epichlorohydrin, and grafted with acrylic acid, a graft with a network structure is obtained; coconut oil reacts with ethylene glycol butyl ether under an alkaline condition to obtain fatty acid salt; the plugging waterproof performance and the durability of the waterproof agent are improved; sodium silicate in the waterproof agent reacts with calcium ions in cement paste to generate a hydrated calcium silicate C-S-H colloidal core, C-S-H gel can be formed by the hydrated calcium silicate C-S-H colloidal core and calcium hydroxide in cement, and whiskering problem of the waterproof agent is avoided; sodium silicate is dissolved in water to form a colloidal sodium silicate aqueous solution, the particle size of the colloidal sodium silicate aqueous solution is smaller than that of cement particles, concrete micropores and gaps formed by hydration of the cement particles can be filled with particles of the colloidal sodium silicate aqueous solution, the microstructure of plastic slurry and set cement is improved, and the permeability of concrete to water is reduced.

Description

technical field [0001] The invention discloses a preparation method of a waterproofing agent, which belongs to the technical field of building waterproofing. Background technique [0002] Waterproofing agent is a kind of chemical admixture, which is added to cement. When the cement sets and hardens, its volume expands, which plays the role of compensating shrinkage, tensioning steel bars to generate prestress, and fully filling cement gaps. It is used for waterproofing projects such as basements, toilets, reservoirs, purification pools, tunnels, and roofs, roofs, floors, and walls. [0003] Concrete is the most widely used building material today, but many concretes fail due to corrosion. Water plays an important role in the corrosion process, especially for concrete materials in coastal areas. Corrosion leads to failure. [0004] Silicone includes silane, polysiloxane such as silicone oil, and silicone resin is the preferred material for waterproofing. It has been widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B103/65
CPCC04B40/0046C04B2103/65C04B24/38C04B22/124C04B22/062C04B24/005C04B22/122C04B22/14C04B24/00C04B24/045C04B22/10C04B24/16C04B24/124C04B24/023C04B24/42C04B22/16C04B24/08C04B22/00C04B18/101
Inventor 刘沁
Owner 广州国色生物科技有限公司
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