Compound water repellent containing tertiary amine polymer brush grafted nano silicon dioxide

A nano-silica, polymer brush technology, applied in the direction of repelling fiber, plant fiber, fiber treatment, etc. to liquid, can solve the problem of affecting the dispersion of latex particles, affecting the stability of water repellent, affecting the stability of emulsion, etc. problems, to achieve excellent comprehensive properties, overcome poor fastness, and improve the effect of dispersion stability

Active Publication Date: 2020-11-17
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cationic surfactant emulsification coating nano-silica method has the problem of surfactant compatibility between the used surfactant and the cationic water repellent agent, and at the same time, the surfactants of the two are prone to secondary adsorption and desorption of each other, which affects the stability of the emulsion. sex
After polymer physical adsorption method wraps nano-silica and cationic water-repellent agent, due to the influence of the chemical structure of the polymer itself, the cationic surfactant of water-repellent agent has the problem of redistribution, that is, part of it is transferred to the wrapped carbon dioxide. On the polymer of silicon, thus affecting the stability of the water repellent
Coupling agent modification method, such as quaternizing chlorosilane with long carbon chain tertiary amine, and hydrolyzing and condensing on the surface of silicon spheres to prepare surface cationized nano-silica, but this form of silica has a hydrophobic surface. The carbon chain is too long, and the lipophilicity is strong. When added to the water-repellent emulsion, the long carbon chain will penetrate into the latex particles and form crosslinks between the latex particles, which will affect the dispersion of the latex particles in the original system.

Method used

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  • Compound water repellent containing tertiary amine polymer brush grafted nano silicon dioxide
  • Compound water repellent containing tertiary amine polymer brush grafted nano silicon dioxide
  • Compound water repellent containing tertiary amine polymer brush grafted nano silicon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Follow the steps below to prepare polymer brush grafted nano-silica for cationic water repellent compounding

[0052] (1) Nano silica double bond modification:

[0053] Preparation of nano silicon dioxide: under magnetic stirring, tetraethyl orthosilicate was added dropwise into a round bottom flask containing a mixed solution of ammonia water and ethanol with a constant pressure funnel, and the stirring reaction was continued at room temperature, and the reaction system became White, centrifuge the reacted silicon dioxide dispersion, get silica gel at the bottom of the centrifuge tube, add an appropriate amount of absolute ethanol again, ultrasonically disperse, centrifuge again, repeat 3 times, and vacuum dry to get nano silicon dioxide. Among them, the volume ratio of tetraethyl orthosilicate, ethanol, and ammonia water is controlled to be 1:34:2.5, and the reaction temperature is 30°C, so that nano-silica with a uniform particle size distribution of 100 nm can be ob...

Embodiment 2

[0065] (1) Nano silica double bond modification:

[0066] With reference to the method in embodiment 1, silicon dioxide dispersion liquid is obtained;

[0067] Heat the 100nm silica dispersion to 80°C, add the double bond modifier γ-methacryloxypropyl trimethoxysilane under stirring, the dosage is 20g / L, react for 6h, centrifuge at 10000rpm for 10min, wash with ethanol , and vacuum-dried to obtain nano silicon dioxide after double bond modification.

[0068] (2) Polymer brush grafted nano-silica:

[0069] Double-bond modified nano-silica is ultrasonically dispersed in deionized water at a concentration of 30g / L, and the cationic tertiary amine monomer diethylaminoethyl methacrylate is added under stirring, the mass of the cationic tertiary amine monomer and nano-silica The ratio is 1:0.5. Nitrogen was passed for 30 minutes to remove the air. After heating to 75°C, 1.0% cationic monomer mass of water-soluble initiator potassium persulfate was added, and the reaction was carr...

Embodiment 3

[0075] (1) Nano silica double bond modification:

[0076] Referring to the method in Example 1, a silicon dioxide dispersion was prepared.

[0077] Heat the 100nm silica dispersion to 60°C, add the double bond modifier methacryloxypropyl triethoxysilane under stirring, the dosage is 10g / L, react for 8h, centrifuge at 10000rpm for 10min, wash with ethanol, vacuum After drying, the nano silicon dioxide modified by the double bond can be obtained.

[0078] (2) Polymer brush grafted nano-silica:

[0079] The double-bond modified nano-silica is ultrasonically dispersed in deionized water at a concentration of 20g / L, and the cationic tertiary amine monomer dimethylaminoethyl acrylate is added under stirring. The mass ratio of the cationic tertiary amine monomer to nano-silica is 1:0.6. Nitrogen was passed for 30 minutes to remove the air. After heating to 75°C, 1.5% cationic monomer mass of water-soluble initiator ammonium persulfate was added, and the reaction was carried out at...

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Abstract

The invention discloses a compound water repellent agent containing tertiary amine polymer brush grafted nano silicon dioxide, and belongs to the field of environment-friendly textiles. According to the invention, specific tertiary amine polymer brush graft modified nano-silica is facilitated, and the polymer brush graft modified nano-silica has good water dispersibility, can be doped, mixed and compounded with a cationic water repellent to obtain the water repellent, and does not influence the stability of the emulsion. After fabric is treated by the obtained compound water repellent, the water repellent is adsorbed on the surface of cotton fiber due to electrostatic interaction and is covered by a water repellent film, so that the compound water repellent has excellent capacity of improving the surface roughness of the fiber, the hydrophobic property of the water repellent can be effectively improved, the use amount of the water repellent is reduced to a certain extent, and the problem of environmental pollution in the use process of the water repellent is solved.

Description

technical field [0001] The invention relates to a composite water-repellent agent containing tertiary amine polymer brushes grafted with nano silicon dioxide, which belongs to the field of environment-friendly textiles. Background technique [0002] With the rise of awareness of environmental protection and the improvement of environmental protection policies, the negative effects of organic fluorine substances, which have always played an important role in the field of water repellency, have been gradually discovered. Organic fluorine substances are difficult to degrade, have high bioaccumulation and multi-toxicity, and pose a serious threat to the ecological environment. Therefore, seeking alternatives to fluorocarbon water repellents has become a research hotspot in recent years. Substances such as long carbon chain aliphatic hydrocarbons and organic silicon are good substitutes for fluorine, but their surface energy is slightly higher than that of fluorine, which cannot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/34D06M15/27D06M101/06
CPCC08F292/00D06M15/267D06M2200/12D06M2200/11D06M2101/06C08F220/34
Inventor 杜金梅周攀飞姚安康许长海
Owner QINGDAO UNIV
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