环氧树脂-改性聚氨酯及聚脲复合涂层的制备及防护性能研究

张翼, 杨慧敏, 杨志

doi:10.16577/j.issn.1001-1560.2024.0210

材料保护 >

2024 , Vol. 57 >Issue 9: 137 - 147

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0210

工艺篇

环氧树脂-改性聚氨酯及聚脲复合涂层的制备及防护性能研究

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¹太原理工大学化学学院； ²山西省建筑科学研究院集团有限公司

杨慧敏(1987-)，博士，高级实验师，研究方向为材料化学、电化学，电话:18734902896， E-mail:yanghuimin＠tyut.edu.cn

收稿日期: 2024-04-29

修回日期: 2024-05-17

录用日期: 2024-05-18

网络出版日期: 2024-11-14

基金资助

2021 山西省重点研发计划(202102110401019)资助

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Study on the Preparation and Protective Performance of Epoxy Resin-Modified Polyurethane and Polyurea Composite Coatings

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(1.College of Chemistry， Taiyuan University of Technology， Taiyuan 030024， China；2.Shanxi Academy of Building Sciences Group Co.， Ltd.， Taiyuan 030001， China)

YANG Huimin(1987-)， Ph.D， Senior Lab Master， Research Focus: Materials Chemistry， Electrochemistry，Tel:18734902896， E-mail:yanghuimin＠tyut.edu.cn

Received date: 2024-04-29

Revised date: 2024-05-17

Accepted date: 2024-05-18

Online published: 2024-11-14

Supported by

Supported by Key Research and Development Plan of Shanxi Province (202102110401019) in 2021

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摘要

为了解决传统防护涂层材料单一、防护性能难以兼顾，单组分多元醇制备聚氨酯分子结构存在缺陷、聚脲固化速率过快的问题，通过改变聚氨酯合成原料中PTMG2000 和聚醚3050 的混合比例来调控聚氨酯交联、微相分离程度以改进其性能，同时采用P1000 与扩链剂MDBA 来制备可手工涂覆的慢反应聚脲，将环氧树脂作为底漆、聚氨酯-聚脲作为面漆，制备了一种具有优良耐磨、防腐、抗冲击等防护性能的涂层。结果表明:当m(PTMG2000) ∶m(聚醚3050)＝1 ∶2 时制备的聚氨酯与PU-3050 相比，其拉伸强度为13.19 MPa，提高了85.25%，伸长率为289.14%，提高了140%，热分解50%的温度从392.45 ℃提高到400.28 ℃，水接触角从90.72°增大到98.29°，综合性能得到提升。复合涂层在15 d 中性盐雾测试后涂层未起泡、锈蚀面积小，高于ISO 9227-2006 标准要求；附着力为0 级，高于ISO 2409-2007 标准要求的3 级；抗冲击强度为100 cm，高于GB/T 1732-2020 标准指定的最高50 cm 冲击强度；在3.5%NaCl 溶液中腐蚀9 d 后阻抗维持在4.245×107 Ω·cm2，30 min 磨损量为10.28 mg，防护性能优异。

关键词： 复合防护涂层; 环氧树脂; 聚氨酯; 慢反应聚脲

本文引用格式

张翼, 杨慧敏, 杨志 . 环氧树脂-改性聚氨酯及聚脲复合涂层的制备及防护性能研究[J]. 材料保护, 2024 , 57(9) : 137 -147 . DOI: 10.16577/j.issn.1001-1560.2024.0210

Abstract

To address the issues of traditional protective coatings that limited material diversity and protective performance are difficult to take into account， single-component polyol-based polyurethane molecular structures exist defects， and curing rate of polyurea is fast， by changing the mixing ratio of PTMG2000 and polyether 3050 in the polyurethane synthesis raw materials to regulate the degree of polyurethane crosslinking and microphase separation to improve its performance， and at the same time， P1000 and chain extender MDBA were used to prepare a slow-reaction polyurea that could be coated by hand， and epoxy resin was used as a primer and polyurethane-polyurea as a topcoat， to prepare a coating that has excellent wear-resistant， corrosion-resistant and impact-resistant protective properties.Results showed that when the ratio of m(PTMG2000) to m(polyether 3050) was 1 ∶2， the polyurethane prepared exhibited a tensile strength of 13.19 MPa， which represented an increase of 85.25%compared to PU-3050.The elongation at break was 289.14%， marking a 140%improvement.The temperature at which 50%thermal decomposition occurred increased from 392.45 ℃to 400.28 ℃， and the water contact angle increased from 90.72° to 98.29°，demonstrating overall performance enhanced.After 15 d of neutral salt spray testing，the composite coating showed no blistering and had a small corrosion area， exceeding the ISO 9227-2006 standard requirements.The adhesion was rated at level 0， surpassing the ISO 2409-2007 standard requirement of level 3.The impact resistance was 100 cm， exceeding the maximum 50 cm impact strength specified by the GB/T 1732-2020 standard.After 9 d of corrosion in a 3.5%NaCl solution， the impedance remained at 4.245×107 Ω·cm2， and the wear loss after 30 min was 10.28 mg， indicating excellent protective performance.

Key words： composite protective coating; epoxy resin; polyurethane; slow reacting polyurea

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