Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nano-alumina modified silane waterproofing agent as well as preparation method and application thereof

A technology of nano-alumina and waterproofing agent, which is applied in the direction of coating, etc., can solve the problems of coating failure, unexplained stability, and inability to achieve protection from the root cause, and achieve good stability and excellent dilution stability.

Active Publication Date: 2019-04-26
SOUTH CHINA UNIV OF TECH
View PDF11 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional film-forming surface protective coatings can block the pores of building materials by covering them on the surface, and can prevent the intrusion of external moisture in a short time. The coating fails, and the protective effect cannot be achieved from the root
However, the pH of the emulsion is acidic, which is not conducive to the alkaline environment of concrete, and its stability has not been explained.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nano-alumina modified silane waterproofing agent as well as preparation method and application thereof
  • Nano-alumina modified silane waterproofing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) At 40°C, add 43.7g of deionized water, 0.6g of Span-80, 3g of Tween-20 and 0.3g of sodium dodecylbenzene sulfonate to a tank equipped with a stirrer, a thermometer and a condenser In a 250mL four-neck flask, stir at a speed of 500r / min for 0.5h to obtain a dispersed emulsifier aqueous solution;

[0051] (2) Add 0.4g of triethylamine into the four-necked flask, then heat up to 70°C, increase the speed to 1500r / min, add 30g of n-octyltriethoxysilane dropwise, and control the dropping time to 1h. Then keep 1500r / min high-speed stirring reaction for 1h to obtain the emulsion;

[0052] (3) Reduce the temperature of the emulsion to 40°C, add 20g of silica sol modified nano-alumina solution, wherein the mass ratio of silica sol to nano-alumina aqueous solution is 13:7, the solid content of silica sol is 30%, and nano-alumina The solid content of the aqueous solution is 20%, then add 1g of polyethylene glycol 400 and 1g of glycerin, properly reduce the rotation speed to 80...

Embodiment 2

[0054] (1) At 30°C, add 35.4g of deionized water, 2.5g of Span-80 and 1g of AEO-25 into a 250mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube in turn, at 300r / min Stir at a rotating speed for 0.5h to obtain a dispersed emulsifier aqueous solution;

[0055] (2) Add 0.6g of triethylamine into the four-neck flask, then heat up to 80°C, increase the speed to 1500r / min, add 40g of n-octyltriethoxysilane dropwise, and control the dropping time to 0.5h , followed by maintaining 1500r / min high-speed stirring reaction for 0.5h to obtain an emulsion;

[0056] (3) Reduce the temperature of the emulsion to 30°C, add 20g of silica sol modified nano-alumina solution, wherein the mass ratio of silica sol to nano-alumina aqueous solution is 13:7, the solid content of silica sol is 30%, and nano-alumina The solid content of the aqueous solution is 20%, then add 0.5g of polyethylene glycol 2000, properly reduce the rotation speed to 500r / min and continue stirrin...

Embodiment 3

[0058] (1) At 40°C, add 35.75g of deionized water, 0.5g of Span-80, 2.5g of Tween-20 and 0.25g of sodium dodecylbenzene sulfonate in turn to the In a 250mL four-neck flask, stir at a speed of 500r / min for 0.5h to obtain a dispersed emulsifier aqueous solution;

[0059] (2) Add 0.5g of triethylamine to the four-neck flask, then heat up to 70°C, increase the speed to 1500r / min, add 40g of n-octyltriethoxysilane dropwise, and control the dropping time to 0.5h , followed by maintaining 1500r / min high-speed stirring reaction for 0.5h to obtain an emulsion;

[0060] (3) Reduce the temperature of the emulsion to 40°C, add 20g of silica sol modified nano-alumina solution, wherein the mass ratio of silica sol to nano-alumina aqueous solution is 16:4, the solid content of silica sol is 30%, and nano-alumina The solid content of the aqueous solution is 20%, and then 0.5 g of polyethylene glycol 2000 is added, the rotation speed is appropriately reduced to 600 r / min and stirring is conti...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Surface contact angleaaaaaaaaaa
Login to View More

Abstract

The invention discloses a nano-alumina modified silane waterproofing agent as well as a preparation method and application thereof. The preparation method comprises the following steps: adding a basiccatalyst into an aqueous solution of a non-ionic composite emulsifier, and adding a silane monomer while heating and stirring at 60-80 DEG C to obtain an emulsion; cooling the emulsion to 30-50 DEG C, then adding modified nano-alumina, and stirring for a reaction to obtain the nano-alumina modified silane waterproofing agent, wherein the modified nano-alumina is obtained by modifying a nano-alumina aqueous solution by silica sol or fumed silica. The prepared silane waterproofing agent has no VOC emission, is good in stability and excellent in waterproof performance, can effectively block theentry of moisture and maintain the gas permeability of a pore structure of a material itself, and can be widely used in the field of building materials.

Description

technical field [0001] The invention belongs to the technical field of building engineering materials, and in particular relates to a nano-alumina modified silane waterproofing agent, a preparation method and application thereof. Background technique [0002] With the continuous advancement of urbanization in our country, the launch of township and urban reconstruction and expansion projects, and the large-scale construction of affordable housing, the construction industry will continue to maintain a stable development trend. In this process, the value of building materials is self-evident. Metaphor. However, building materials (including reinforced concrete, cement, masonry, ceramics, etc.) are materials with heterogeneous porous structures and high permeability. In high humidity, especially in coastal areas, a large amount of moisture in the air can easily enter the building materials. The interior of the structure, resulting in weathering of the building and cracks in th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09D183/04C09D7/62C04B41/65
CPCC04B41/5035C04B41/65C08K2003/2227C08K2201/011C09D183/04C09D7/62C08K9/02C08K3/22C08K3/36C04B41/5031C04B41/4922C04B41/4896C04B41/46C04B41/4535
Inventor 夏正斌李富航
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com