Environment-friendly repeated-writing paper and preparation method therefor

Abstract

The invention discloses environment-friendly repeated-writing paper and a preparation method therefor. According to the environment-friendly repeated-writing paper and the preparation method therefor, a hydroxyl protective group is added into a nano bacterial cellulose suspension with excellent characteristics such as high water absorptivity and water retention ability and good water and air permeability, so as to lower hydrophilicity; a staged reaction is carried out under strong base conditions, so that bacterial cellulose reaches moderate water absorptivity and water retention ability, ink can only be present in a surface layer and be clear in writing while the ink is absorbed, and thus, writing, reading and subsequent handwriting wiping are facilitated; then, a scientifically-compounded dispersant is added, and ultrasonic and high-voltage pulse electric field combined dispersion is carried out, so that a stable and uniform modified bacterial cellulose suspension is obtained; finally, the surface of raw paper is coated with the suspension so as to obtain the writing paper with appropriate ink absorbing uniformity and adhesive power and a dense structure, thus, the writing property of the writing paper can be enhanced, and the clearness of writing is enhanced; and waterproofing and oil-proofing actions can be achieved, most importantly, ink marks on the paper can be erased with a cleanser and the paper can be reused for 40 to 100 times under the condition that the performance of the paper is not affected.

Description

Technical field [0001] The invention relates to repetitive writing paper, in particular to an environmentally friendly repetitive writing paper and a preparation method thereof. Background technique [0002] Paper is one of the main consumables indispensable in our daily life and work. The survey shows that about 40% of printed or copied paper is thrown into the waste paper basket after reading it once, which not only causes a huge waste of resources, but also damages the environment. Therefore, how to reduce the consumption of resources by the paper industry, reduce the damage of the paper industry to the environment, and realize the sustainable development strategy has become a topic of increasing concern by the government and society. [0003] Repetitive writing paper can be used multiple times and repeatedly to reduce paper waste and accelerate the process of sustainable development and environmental protection. At present, there are two main types of research on repetitive w...

AI Technical Summary

Problems solved by technology

[0017] The technical problem solved by the present invention is to overcome the defect of existing repeated writing paper, add hydroxyl protecting group to the nano bacterial cellulose suspension with excellent characteristics such as strong water absorption and water holding capacity, good water permeability and air permeability, etc. Under alkaline conditions, react in stages to make the bacterial cellulose achieve moderate water absorption and water holding capacity; then add a dispersant and use ultrasonic and high-voltage pulse electric field to disperse to obtain a stable and uniform modified bacterial cellulose suspension; finally It is coated on the surface of the base paper to obtain a writing paper with moderate ink absorption uniformity and adhesion, and a dense structure, which can enhance the writing performance of the writing paper; it can also play a waterproof and oil-proof role. Under the condition of not affecting the performance of the paper, the ink on the paper can be wiped off with a cleaning agent, and it can be used repeatedly