Preparation of SiO<sub>2</sub>/PU superhydrophobic coating using rapid expansion of supercritical CO<sub>2</sub>

ZHANG Faxing1; WEI Xiaoli2; XIAO Zhongliang1; CHENG Dejun2; YAN Chenglei3

doi:10.3969/j.issn.0438-1157.2012.07.044

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Preparation of SiO₂/PU superhydrophobic coating using rapid expansion of supercritical CO₂

更新时间：2025-12-10

- Preparation of SiO₂/PU superhydrophobic coating using rapid expansion of supercritical CO₂
- CIESC Journal Issue 7, Pages: 2290-2297(2012)
- 作者机构：
  
  1. 1中北大学化工与环境学院
  2. 四川理工学院材料与化学工程学院
  3. 北京玻钢院复合材料有限公司
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2012.07.044
  CLC： 647
- Online First：05 July 2012，
  
  Published：05 July 2012
- 稿件说明：
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ZHANG Faxing1, WEI Xiaoli2, XIAO Zhongliang1, et al. Preparation of SiO₂/PU superhydrophobic coating using rapid expansion of supercritical CO₂[J]. CIESC Journal, 2012, (7): 2290-2297. DOI: 10.3969/j.issn.0438-1157.2012.07.044.
DOI：

ZHANG Faxing1, WEI Xiaoli2, XIAO Zhongliang1, et al. Preparation of SiO₂/PU superhydrophobic coating using rapid expansion of supercritical CO₂[J]. CIESC Journal, 2012, (7): 2290-2297. DOI: 10.3969/j.issn.0438-1157.2012.07.044. DOI：

摘要

用超临界CO2快速膨胀法制备了SiO2/聚氨酯超疏水涂层。首先用十三氟辛基三乙氧基硅烷（F-硅烷）和γ-(甲基丙烯酰氧基)丙基三甲氧基硅烷（KH-570）改性纳米二氧化硅，制备出含双键的纳米二氧化硅粒子，将其分散在超临界CO2中，再利用超临界CO2快速膨胀法将其喷射到双键封端的且已添加了引发剂的聚氨酯涂层表面，通过加热，使纳米二氧化硅粒子接枝在聚氨酯涂层表面，形成稳固粗糙结构，获得了超疏水性质。研究了喷嘴温度、反应釜温度和压力、偶联剂配比、表面粗糙度对涂层疏水性的影响。结果表明：涂层的静态水接触角可达到169.1°±0.6°；在喷嘴和釜内温度都为90℃，釜内压力为16 MPa，F-硅烷和KH-570配比为1∶1，表面粗糙度为7.3 μm时，所制得涂层具有较好的超疏水性，且具有优良的耐刮伤性。该法高效环保，涂层性能优良，适于大面积制备。

Abstract

The SiO2/PU superhydrophobic coatings were prepared by using rapid expansion of supercritical CO2.Firstly

by modifying nano-silica with thirteen fluoride octyltriethoxysilane(F-silane)andγ-(methacryloyloxy-oxy)propyl trimethoxysilane (KH-570)

nano-silica particles containing double bonds were prepared and then were dispersed in supercritical CO2.At the same time

a polyurethane coating containing double bond and an initiator was prepared.Subsequently

the nano-silica particles were injected onto the polyurethane coating surface making use of rapid expansion of supercritical CO2

and then were dried by heating to form a stable rough structure because of the nano-silica particles being grafted on the polyurethane coating.This way

a SiO2/PU film with superhydrophobic surface was obtained.Moreover

the effect of nozzle temperature

reaction kettle temperature and pressure

ratio of coupling on coating hydrophobicity and surface roughness were studied.The results showed that the static water contact angle of the coating could be up to 169.1°±0.6°.When the temperature of the nozzle and the reaction kettle were all 90℃

the reaction kettle pressure was 16 MPa and ratio of F-silane to KH-570 was 1∶1

the surface roughness was 7.3 μm

the obtained film had good super-hydrophobicity

and had excellent scratch resistance.In addition

the superhydrophobic coating had good performance and was environmental

and also could be produced cost-effectively on a large scale.

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Preparation of SiO2/PU superhydrophobic coating using rapid expansion of supercritical CO2

DOI：10.3969/j.issn.0438-1157.2012.07.044

摘要

Abstract

关键词

Keywords

references

Preparation of SiO₂/PU superhydrophobic coating using rapid expansion of supercritical CO₂