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A kind of fluoroalkyl-modified composite silicone waterproofing agent and its preparation method and application

A fluoroalkyl siloxane and composite technology, which is applied in the field of fluoroalkyl modified composite organic silicon waterproofing agent and its preparation, can solve the difficulty of achieving a balance between penetration depth and hydrophobicity, liquid silane protective agent Low penetration depth and other problems, to solve the problem of emulsion stability, excellent waterproof effect, and improve construction performance

Active Publication Date: 2017-09-29
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if a silane paste protective agent is prepared by combining the advantages of the third and fourth protective agents, it can solve the problem of low penetration depth of liquid silane protective agents on the one hand, and can solve the problem of emulsion protective agents on the other hand. emulsion stability problem, it is a new type of silicone waterproofing agent
[0004] The products of Chinese patent publications CN1214353A and CN101580356A are all a single type of alkyltriethoxysilane waterproofing agent, and do not use silanes with different carbon chain lengths for compounding, and they are also emulsion-type products, so that in the depth of penetration It is difficult to achieve a balance between the two properties of hydrophobicity and hydrophobicity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) First, 10g of composite emulsifier Gransurf 61+Gransurf 71 (mass ratio 1:1), 20g of polyvinyl alcohol (Taiwan Changchun BP-17), 10g of silane coupling agent KH-550 and 10g of sulfuric acid The aluminum was stirred and dissolved in 174 g of water at 70°C to form an O / W emulsion A.

[0047] (2) 10g of composite emulsifier Gransurf 61+Gransurf 71 (mass ratio of 1:1), 150g of n-butyltriethoxysilane, 100g of n-dodecyltriethoxysilane, 400g of ten Trifluorooctyltriethoxysilane was added to the remaining 116 g of water, and stirred well to form W / O emulsion B.

[0048] (3) After Emulsion A is completely dissolved, use a peristaltic pump to drop Emulsion B into Emulsion A at a dropping rate of 1 mL / min. Stir while dripping at a stirring speed of 5000r / min. When the paste begins to form, The heat is removed in a beaker ice water bath in time, phosphoric acid is added to adjust the pH of the system to 6 after the dripping is completed, and the stirring is stopped for 15 minutes to...

Embodiment 2

[0050] (1) 8g of composite emulsifier Gransurf 71+Gransurf 77 (mass ratio is 1:3), 30g of polyvinyl alcohol (Taiwan Changchun BP-24), 20g of silane coupling agent KH-560 and 30g of aluminum sulfate The O / W emulsion A was formed by stirring and dissolving in 232 g of water at 50°C.

[0051] (2) Combine 12g of composite emulsifier Gransurf 71+Gransurf 77 (mass ratio of 1:3), 100g of n-butyltrimethoxysilane, 100g of n-tetradecyltriethoxysilane, 400g of 15 Fluorine nonyl triethoxy silane was added to the remaining 68 g of water and stirred well to form W / O emulsion B.

[0052] (3) After Emulsion A is completely dissolved, use a peristaltic pump to drop Emulsion B into Emulsion A at a dropping rate of 5 mL / min. Stir while dripping at a stirring speed of 6000r / min. When the paste begins to form, The heat is removed in a beaker ice water bath in time, boric acid is added to adjust the pH of the system to 3 after the addition is completed, and the pH of the system is adjusted after stirri...

Embodiment 3

[0054] (1) First, 12g of composite emulsifier sodium dodecylbenzene sulfonate + Gransurf 71 (mass ratio of 3:1), 20g of polyvinyl alcohol (Sinopec 1788), 10g of silane coupling agent KH-570 10g aluminum sulfate was stirred and dissolved in 203g water at 60°C to form O / W emulsion A.

[0055] (2) 8g of composite emulsifier sodium dodecylbenzene sulfonate + Gransurf 71 (mass ratio of 3:1), 100g of n-hexyltriethoxysilane, 150g of n-decyltriethoxysilane, 400g of heptafluorodecyltriethoxysilane was added to 87g of water, and stirred well to form W / O emulsion B.

[0056] (3) After Emulsion A is completely dissolved, use a peristaltic pump to drop Emulsion B into Emulsion A at a dropping rate of 10 mL / min, and stir while dripping. The stirring speed is 5500r / min. When the paste begins to form, The heat is removed in a beaker ice-water bath in time, hydrochloric acid is added to adjust the pH of the system to 4 after the dropwise addition is completed, and the pH of the system is adjusted ...

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Abstract

The invention belongs to the field of waterproofing agents and discloses a fluoroalkyl-modified composite silicone waterproofing agent as well as its preparation method and application. The fluoroalkyl-modified composite silicone waterproofing agent of the present invention is prepared from the following raw materials in mass percent: short carbon chain alkyl siloxane 10-15%; long carbon chain alkyl siloxane 10-15%; 40-45% of fluoroalkyl siloxane; 2-3% of compound emulsifier; 2-5% of polyvinyl alcohol; 1-5% of silane coupling agent; 1-3% of aluminum sulfate; the rest is water. In the present invention, long carbon chain alkyl siloxane, short carbon chain alkyl siloxane and fluoroalkyl siloxane are used together to form a composite system, which not only ensures that the product has good waterproof performance, but also makes the product Has excellent permeability and weather resistance. Moreover, the waterproofing agent is a W / O / W type paste, which effectively solves the stability problem of the waterproofing agent, and can be widely used in fields such as waterproofing of concrete, bricks, mortars, and glass antifouling.

Description

Technical field [0001] The invention belongs to the field of waterproofing agents, and particularly relates to a fluoroalkyl modified composite organic silicon waterproofing agent, and a preparation method and application thereof. Background technique [0002] The concrete structure is exposed to the air or immersed in water for a long time, it is easy to absorb moisture and harmful substances brought by moisture and corrode, which affects its service life. Therefore, it is particularly necessary to protect the concrete surface. Permeable silane protective agent has outstanding advantages such as simple surface treatment, strong penetration, anti-oxidation, anti-ultraviolet, and surface resistance to abrasion. At the same time, it does not completely seal the pores on the concrete surface. The service life can reach more than 35 years, and it has excellent application prospects , Is a new environmentally friendly product. Silanes used as water repellents are mainly long-chain al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B22/14C04B103/65
Inventor 袁腾杨卓鸿涂伟萍周显宏
Owner SOUTH CHINA AGRI UNIV