Preparation and performance of modified h-BN/polyurethane acrylic coatings

doi:10.16085/j.issn.1000-6613.2021-1404

Abstract

Abstract:

In this paper, hydroxylated hexagonal boron nitride (BNNSs) was prepared by hydrothermal method. The functionalized hexagonal boron nitride (Fh-BN) was obtained by grafting isophorone diisocyanate (IPDI) and hydroxyethyl acrylate (HEA) on the surface of BNNSs. The resulting Fh-BN was adding into the PUA coating and the modified Fh-BN/polyurethane acrylic coating was successfully prepared. The effect of time and temperature on BNNSs B—OH content was studied respectively, and the B $-$ OH content was 5.97% in the optimal hydrothermal reaction of 180℃ for 12h. The modified Fh-BN/polyurethane acrylic coating was evaluated by mechanical performance test, water resistance, coating impedance and Tafel polarization curve test. When 0.75% Fh-BN was added to the coating, the hardness reached 3H with the flexibility of 0.5mm and the impact resistance of 50cm. The water absorption of coating reduced by 4.96%, Fh-BN improved heat resistance with T_50% arising 6℃ and Immersion without change in water 168h, while E_corr shifted positively from -0.4886V to -0.32124V and I_corr decreased from 2.5552×10^-7A/cm² to 1.5555×10^-8A/cm². The mechanical properties, water resistance and corrosion resistance of the coating were significantly improved by Fh-BN.

Key words: hexagonal boron nitride, polyurethane acrylate, corrosion, coating

摘要：

利用水热法制备羟基化六方氮化硼（BNNSs），采用异佛尔酮二异氰酸酯（IPDI）和丙烯酸羟乙酯（HEA）在其表面进行接枝得到功能化六方氮化硼（Fh-BN）。然后将得到的Fh-BN掺入有机硅改性的聚氨酯丙烯酸酯（PUA）涂料中，成功制备出改性h-BN/聚氨酯丙烯酸酯涂料。研究了水热时间、温度对BNNSs硼羟基含量的影响，利用XPS分析得出水热反应最佳反应条件为180℃、12h，B—OH质量分数达到5.97%。通过机械性能、综合热分析、耐水性、涂层交流阻抗和Tafel极化曲线进行测试分析，掺杂0.75%Fh-BN涂膜硬度达到3H，耐冲击性50cm，柔韧性0.5mm；与未掺杂前涂层相比，吸水率降低4.96%；涂层耐热性提高，T_50%提升了6℃；耐水测试浸泡168h后涂膜无变化；电化学测试表明：0.75%Fh-BN涂层阻抗R₁达到1.818×10⁹Ω·cm²，比原有涂层提升了两个数量级，E_corr由-0.4886V正移至-0.32124V，I_corr由2.5552×10^-7A/cm²降低至1.5555×10^-8A/cm²。Fh-BN的引入显著提升了涂层的机械性能、热稳定性和耐腐蚀性。

关键词: 六方氮化硼, 聚氨酯丙烯酸酯, 腐蚀, 涂层

CLC Number:

TQ630.7

LI Boshen, WEI Ming, HU Yaoyao, DONG Yuelin, DONG Qunfeng, YANG Lifeng. Preparation and performance of modified h-BN/polyurethane acrylic coatings[J]. Chemical Industry and Engineering Progress, 2022, 41(6): 3194-3202.

李博申, 魏铭, 胡瑶瑶, 董月林, 董群锋, 杨立峰. 改性h-BN/聚氨酯丙烯酸酯涂料的制备与性能[J]. 化工进展, 2022, 41(6): 3194-3202.

Figures/Tables 17

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样品	T_10%/℃	T_50%/℃	T_max1%/℃	T_max2%/℃
SiPUA	291	353	328	389
SiPUA/0.25%Fh-BN	291	355	329	389
SiPUA/0.50%Fh-BN	296	359	328	390
SiPUA/0.75%Fh-BN	296	369	329	390
SiPUA/1.00%Fh-BN	292	353	328	387

样品	T_10%/℃	T_50%/℃	T_max1%/℃	T_max2%/℃
SiPUA	291	353	328	389
SiPUA/0.25%Fh-BN	291	355	329	389
SiPUA/0.50%Fh-BN	296	359	328	390
SiPUA/0.75%Fh-BN	296	369	329	390
SiPUA/1.00%Fh-BN	292	353	328	387

样品名	CPE₁		R₁/Ω·cm²
样品名	CPE₁-T	CPE₁-P	R₁/Ω·cm²
SiPUA	1.6375×10^-9	0.93906	3.0367×10⁷
SiPUA/0.25%Fh-BN	1.5303×10^-9	0.94336	3.745×10⁷
SiPUA/0.50%Fh-BN	1.4581×10^-9	0.94415	7.4735×10⁷
SiPUA/0.75%Fh-BN	1.0655×10^-9	0.94566	1.818×10⁹
SiPUA/1.00%Fh-BN	6.6752×10^-9	0.81005	2.110×10⁶

样品名	CPE₁		R₁/Ω·cm²
样品名	CPE₁-T	CPE₁-P	R₁/Ω·cm²
SiPUA	1.6375×10^-9	0.93906	3.0367×10⁷
SiPUA/0.25%Fh-BN	1.5303×10^-9	0.94336	3.745×10⁷
SiPUA/0.50%Fh-BN	1.4581×10^-9	0.94415	7.4735×10⁷
SiPUA/0.75%Fh-BN	1.0655×10^-9	0.94566	1.818×10⁹
SiPUA/1.00%Fh-BN	6.6752×10^-9	0.81005	2.110×10⁶

样品	E_corr/V	I_corr/A·cm^-2
SiPUA	-0.4886	2.5552×10^-7
SiPUA/0.25%Fh-BN	-0.46417	1.7361×10^-7
SiPUA/0.50%Fh-BN	-0.4615	2.1443×10^-7
SiPUA/0.75%Fh-BN	-0.32124	1.5555×10^-8
SiPUA/1.00%Fh-BN	-1.124	3.8508×10^-6