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Fluoroalkyl-modified composite organosilicon water-proofing agent and preparing method and application thereof

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 Problems such as low penetration depth can solve the problem of emulsion stability, excellent waterproof effect, and improve the effect of permeability

Active Publication Date: 2015-12-30
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) Stir 10g of composite emulsifier Gransurf61+Gransurf71 (mass ratio 1:1), 20g of polyvinyl alcohol (Taiwan Changchun BP-17), 10g of silane coupling agent KH-550 and 10g of aluminum sulfate O / W Emulsion A was formed by dissolving in 174 g of water at 70°C.

[0047] (2) Combine 10g of composite emulsifier Gransurf61+Gransurf71 (mass ratio 1:1), 150g of n-butyltriethoxysilane, 100g of n-dodecyltriethoxysilane, 400g of tridecafluoro Add octyltriethoxysilane to the remaining 116g of water and stir well to form W / O emulsion B.

[0048] (3) After the emulsion A is completely dissolved, use a peristaltic pump to drop the emulsion B into the emulsion A at a rate of 1mL / min, and stir while adding, at a stirring speed of 5000r / min. When a paste starts to form, put Ice-water bath in the beaker to remove the heat in time, after the dropwise addition, add phosphoric acid to adjust the pH of the system to 6, stop stirring after 15 minutes, and then prepare the W / O / W fluoroalkyl mo...

Embodiment 2

[0050] (1) Stir and dissolve 8g of composite emulsifier Gransurf71+Gransurf77 (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 O / W Emulsion A was formed in 232 g of water at 50°C.

[0051] (2) Combine 12g of composite emulsifier Gransurf71+Gransurf77 (mass ratio is 1:3), 100g of n-butyltrimethoxysilane, 100g of n-tetradecyltriethoxysilane, 400g of pentafluorononyl Add triethoxysilane to the remaining 68g of water and stir well to form W / O emulsion B.

[0052] (3) After the emulsion A is completely dissolved, use a peristaltic pump to drop the emulsion B into the emulsion A at a rate of 5 mL / min, and stir while adding, at a stirring rate of 6000 r / min. When the paste starts to form, put Ice-water bath in the beaker to remove the heat in time, add boric acid to adjust the pH of the system to 3 after the dropwise addition, stop stirring after 5 minutes, and then prepare the W / O / W fluoroalkyl m...

Embodiment 3

[0054] (1) First, 12g of compound emulsifier sodium dodecylbenzenesulfonate+Gransurf71 (mass ratio is 3:1), 20g of polyvinyl alcohol (Sinopec 1788), 10g of silane coupling agent KH-570 and 10 g of aluminum sulfate was stirred and dissolved in 203 g of water at 60° C. to form O / W emulsion A.

[0055] (2) 8g of compound emulsifier sodium dodecylbenzenesulfonate+Gransurf71 (mass ratio is 3:1), 100g of n-hexyltriethoxysilane, 150g of n-decyltriethoxysilane, 400g Heptadecafluorodecyltriethoxysilane 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 drip emulsion B into emulsion A at a rate of 10mL / min, and stir while adding, at a stirring speed of 5500r / min. When a paste begins to form, put Ice-water bath in the beaker to remove the heat in time, add hydrochloric acid to adjust the pH of the system to 4 after the dropwise addition, stop stirring after 10 minutes, and then prepare the W...

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Abstract

The invention belongs to the field of water-proofing agents and discloses a fluoroalkyl-modified composite organosilicon water-proofing agent and a preparing method and application thereof. The fluoroalkyl-modified composite organosilicon water-proofing agent is prepared from, by mass, 10-15% of short-carbon-chain alkyl siloxane, 10-15% of long-carbon-chain alkyl siloxane, 40-45% of fluoroalkyl siloxane, 2-3% of complex emulsifier, 2-5% of polyvinyl alcohol, 1-5% of silane coupling agent, 1-3% of aluminum sulfate and the balance water. Short-carbon-chain alkyl siloxane, long-carbon-chain alkyl siloxane and fluoroalkyl siloxane are adopted for being used together to form a composite system, and it is ensured that the water-proofing agent has a good waterproof property and has excellent permeability and weather resistance; the water-proofing agent is W / O / W type pasty, and capable of being widely applied to the waterproof fields of concrete, bricks, mortar and the like, and the antifouling fields of glass and the like, and stability of the water-proofing agent is effectively achieved.

Description

technical field [0001] The invention belongs to the field of waterproofing agents, in particular to a fluoroalkyl-modified composite silicone waterproofing agent and its preparation method and application. Background technique [0002] The concrete structure is exposed to the air or soaked in water for a long time, and it is easy to absorb moisture and harmful substances brought by the moisture and cause corrosion, thereby affecting its service life. Therefore, it is particularly necessary to protect the concrete surface. Penetrating silane protective agent has outstanding advantages such as simple surface treatment, strong penetration, anti-oxidation, anti-ultraviolet, and not easy to wear on the surface. At the same time, it does not completely seal the pores on the concrete surface, and its service life can reach more than 35 years. , for new environmental protection products. Silanes used as waterproofing agents are mainly long-chain alkylsiloxanes, usually referring to...

Claims

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Application Information

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