Use of silane composite emulsion as anti-cracking enhancer

Patent metadata

Field	Value
Publication number	US-12509396-B2
Application number	US-202118004560-A
Country	US
Kind code	B2
Filing date	Jul 27, 2021
Priority date	Jun 28, 2021
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

Provided is the use of a silane composite emulsion as an anti-cracking enhancer in a cement-based material. In the present disclosure, active groups on an isobutyltriethoxysilane molecule react with hydroxyl groups on a surface of a mortar to form a layered hydrophobic structure, slowing down a water loss inside the mortar of a cement-based material. The dehydration of butyl acrylate forms a network structure, which fills pores of the cement-based material, inhibits shrinkage of the cement-based material, and reduces the cracking caused by the shrinkage. Tetraethoxysilane can undergo hydrolysis at a room temperature to generate nano-silica with a large number of hydroxyl groups on a surface; and the nano-silica can undergo secondary hydration with calcium hydroxide in the cement to form a secondary hydration product C—S—H gel, thereby filling most of voids to make a structure of the cement hydration product denser, to increase a strength of the mortar.

First claim

The invention claimed is:

1 . A cement-based material product, comprising a silane composite emulsion used as an anti-cracking enhancer;
wherein the silane composite emulsion comprises the following components by mass percentage:
tetraethoxysilane 15% to 50%;
isobutyltriethoxysilane 10% to 60%;
butyl acrylate 10% to 60%;
magnesium oxide 13% to 20%;
a first emulsifier 0.1% to 2%;
a second emulsifier 0.1% to 3%;
a dispersant 0.1% to 0.5%; and
water as a balance, and
wherein the cement-based material product is prepared by a method comprising:
mixing the silane composite emulsion with a cement-based material and water to obtain a cement mortar; and
conducting maintenance on the cement mortar to obtain the cement-based material product.

2 . The cement-based material product according to claim 1 , wherein the first emulsifier is one selected from the group consisting of sorbitan monooleate, 1,2-propanediol monolaurate, and sorbitan stearate, and the second emulsifier is one selected from the group consisting of a fatty alcohol polyoxyethylene ether, polyoxyethylene (20) sorbitan monolaurate, and sodium dodecyl sulfate (SDS).

3 . The cement-based material product according to claim 1 , wherein the dispersant is selected from the group consisting of polyethylene glycol (PEG), polypropylene glycol (PPG), and polyvinyl alcohol (PVA).

4 . The cement-based material product according to claim 1 , wherein a preparation method of the silane composite emulsion comprises the following steps:
(1) conducting first mixing on the first emulsifier, the isobutyltriethoxysilane, the butyl acrylate, and the dispersant to obtain an oil phase; (2) conducting second mixing on the second emulsifier, the magnesium oxide, and water to obtain an aqueous phase; and (3) adding the oil phase and the tetraethoxysilane to the aqueous phase to conduct emulsification to obtain the silane composite emulsion; wherein step (1) and step (2) are conducted in any order.

5 . The cement-based material product according to claim 4 , wherein the first mixing is conducted at 1,000 r/min to 2,200 r/min and 30° C. to 65° C.; and
the second mixing is conducted at 1,000 r/min to 2,200 r/min and 30° C. to 65° C.

6 . The cement-based material product according to claim 4 , wherein the emulsification is conducted at a temperature of 30° C. to 80° C. for 4 h to 8 h by stirring at 1,300 r/min to 2,500 r/min.

7 . The cement-based material product according to claim 1 , wherein the silane composite emulsion has a mass of 0.1% to 3% of a mass of the cement-based material, and has a solid content of 70% to 85%.

8 . The cement-based material product according to claim 7 , wherein the silane composite emulsion has the mass of 2% of the mass of the cement-based material.

9 . The cement-based material product according to claim 1 , wherein the cement mortar has a water-cement ratio of 0.3 to 0.6 and a cement-sand ratio of 1:3.

10 . The cement-based material product according to claim 1 , wherein the maintenance is conducted at a temperature of 15° C. to 25° C. with a relative humidity of greater than or equal to 50%.

11 . A silane composite emulsion, comprising:
tetraethoxysilane 15% to 50%; isobutyltriethoxysilane 10% to 60%; butyl acrylate 10% to 60%; magnesium oxide 13% to 20%; a first emulsifier 0.1% to 2%; a second emulsifier 0.1% to 3%; a dispersant 0.1% to 0.5%; and water as a balance.

12 . The silane composite emulsion according to claim 11 , wherein the first emulsifier is one selected from the group consisting of sorbitan monooleate, 1,2-propanediol monolaurate, and sorbitan stearate, and the second emulsifier is one selected from the group consisting of a fatty alcohol polyoxyethylene ether, polyoxyethylene (20) sorbitan monolaurate, and SDS.

13 . The silane composite emulsion according to claim 11 , wherein the dispersant is selected from the group consisting of PEG, PPG, and PVA.

Assignees

• Univ Qingdao Technology

Inventors

• Li Shaochun
• Xu Shilin
• Liu Ang
• Geng Yongjuan
• Hou Dongshuai
• Zhang Ruiyong
• Jin Zuquan
• Gao Song

Classifications

• C04B40/0039 Primary

  Premixtures of ingredients · CPC title

• C04B2111/343

  Crack resistant materials · CPC title

• C04B2103/408

  Dispersants · CPC title

• C04B40/0046

  characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures · CPC title

• C04B22/066

  Magnesia; Magnesium hydroxide · CPC title