Preparation and Application of Polyurethane Coating Material Based on Epoxycyclohexane-Epoxychloropropane Protective for Paper

Juan Liu,Hua Li,Shan Jin ,Yuhua Shen ,Yingping Qi

doi:10.3390/coatings11081005

Juan Liu, Hua Li + Show 3 more

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https://doi.org/10.3390/coatings11081005

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Abstract

Paper historic relics are of great value to research and preserve. However, with the change of environment, paper cultural relics are constantly aging and damaged. Therefore, the reinforcement and conservation of the paper is an important topic in the field of cultural relics protection; thus, it is a crucial and arduous task to discover high-performance protective materials. The coating reinforcement method is a kind of commonsense method to strengthen the paper. Additionally, it is key to select appropriate reinforcing resins. Polyurethane has influence on the improvement of paper strength, stability, and appearance. The epoxycyclohexane-epoxychloropropane polyether polyol was prepared with epoxycyclohexane and epoxychloropropane as materials, glycerol as the initiator, boron trifluoride diethyl etherate as the catalyst, and dichloromethane as the solvent. Infrared (IR) spectroscopy as well as proton nuclear magnetic resonance (1HNMR) spectroscopy were adopted to characterize the structure of the synthetic copolyether. Then, polyurethane based on epoxycyclohexane-epoxychloropropane was prepared by the synthetic copolyether reacting with hexamethylene diisocyanate (HDI) trimer. The effect of the mass concentration of polyurethane on the tensile strength, elongation, folding endurance, and the tearing strength of paper samples were tested. When 10% polyurethane solution was applied to paper, not only were the mechanical properties greatly improved, but the gloss and brightness also changed slightly, which conformed to the principle of “repair as old”. The above results indicate that the synthetic polyurethane combines the advantages of epoxycyclohexane-poxychloropropane polyether polyol along with polyurethane, presenting excellent properties in paper reinforcement or conservation.

Highlights

Introduction published maps and institutional affilPaper historic relics, precious materials recording human history, culture, science and technology, have important historical, cultural, artistic, and reference value
They have to withstand the vicissitudes of history, and erosion from environmental pollution, oxygen, light, temperature, biology, and water, which has led to the conundrum of paper conservation throughout the world [7]
When the mass concentration to 3739.4 N/m, with an increase of 238%. This indicates that polyurethane based on of the polyurethane was 25%, the tensile strength increased from 1105 N/m to 3739.4 N/m, epoxycyclohexane-epoxychloropropane polyether polyol and the paper may form a with an increase of 238%

Summary

Introduction

Precious materials recording human history, culture, science and technology, have important historical, cultural, artistic, and reference value. Paper historic relics are organic artifacts that are highly susceptible to aging and deterioration. They have to withstand the vicissitudes of history, and erosion from environmental pollution, oxygen, light, temperature, biology, and water, which has led to the conundrum of paper conservation throughout the world [7]. The reinforcement and conservation of paper is an important topic in the field of cultural relics protection; it is a crucial and arduous task to discover high-performance protective materials. Coating reinforcement method is a kind of commonsense method to strengthen the paper [8].

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