Water-resistant transparent paper and its preparation method and application

A technology of transparent paper and hydrophobic groups, which is applied in papermaking, textile and papermaking, pulping with halogen compounds, etc., can solve the problems of lack of water resistance, lack of strength, and increased processes, so as to achieve water resistance and transparency. The effect of durability, wide use scene, excellent wear resistance

Active Publication Date: 2022-06-21
NANJING UNIV
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Problems solved by technology

However, ordinary paper itself is not water-resistant, and transparent paper is mostly made of nanofibers. Compared with paper made of larger-scale fibers, it cannot withstand high-humidity environments. If it is soaked in water, it will quickly dissolve and disappear. , does not have any strength at all, and this greatly limits the application scenarios of transparent paper
[0004] Traditional water-resistant paper manufacturing methods can be mainly divided into two categories. One is to avoid direct contact between cellulose fibers and water. This type of method mainly introduces other additives of hydrophobicity and water resistance to coat or fill cellulose into the fibers. In fact, the cellulose paper itself does not really have water-resistant properties; the second is to modify the cellulose by regeneration, cross-linking, grafting, etc., for example, the hydrophobic groups can be acetylated, silane Basement, esterification and graft copolymerization are introduced into the surface of the fiber to endow the cellulose with water resistance. However, these reaction processes need to use some flammable, harmful to human health and non-environmental friendly organic solvents, and will increase additional processes, and then increase production cost
As another example, cellulose can also be dissolved to prepare a dispersion, and after forming a gel, strong acid or heavy metal salt can be added for treatment and preparation. However, strong acid hydrolysis is easy to cause equipment corrosion, and a large amount of waste acid is difficult to handle, which will cause various environmental problems. Heavy metal salt It will also cause serious pollution to the environment
Moreover, the reaction conditions in the above preparation methods are relatively harsh, which will have a certain impact on the crystal structure of cellulose itself, resulting in a decline in the performance of nanocellulose-based materials. Therefore, it is difficult to prepare very thin transparent water-resistant paper by these methods

Method used

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  • Water-resistant transparent paper and its preparation method and application
  • Water-resistant transparent paper and its preparation method and application
  • Water-resistant transparent paper and its preparation method and application

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preparation example Construction

[0028] The present invention also provides a method for preparing the aforementioned cellulose water-resistant transparent paper, which includes the following steps: immersing the cellulose transparent paper in an alkaline solution for treatment, cleaning after the treatment is completed, and then drying.

[0029]The natural cellulose crystal form in nature is cellulose type I, and the molecular chains of cellulose type I are arranged in parallel. After the cellulose paper is immersed in an alkaline solution, it is converted into cellulose type II after being treated with an alkaline solution. The molecular chains of the cellulose type II are anti-parallel. From the appearance, the cellulose type II is helical. Specifically, when the cellulose paper is immersed in the lye solution, it first swells, so that the alkali penetrates into the crystal plane of the crystallization zone and forms a hydrated crystalline compound with the cellulose molecules. Part of it forms an amorphou...

Embodiment 1

[0045] The basswood sawdust was mixed with a sodium hypochlorite solution with a concentration of 15%, the mass ratio of sawdust and sodium hypochlorite was 1:10, and the temperature was 50 ° C, and the reaction was carried out for 10 minutes. After the reaction, washed with water three times to remove the residual sodium hypochlorite. The slurry was filtered with a suction filtration device to remove a large amount of water, and then the product was placed in a press, and the pressure was maintained at 0.1 MPa for 0.1 hour to obtain transparent paper;

[0046] The transparent paper was placed in an aqueous sodium hydroxide solution with a concentration of 20% by mass and a temperature of 25° C. for 5 minutes, and then washed for 5 minutes to obtain a water-resistant transparent paper material. In the water-resistant transparent paper, the fiber diameter is about 600 nm, the paper thickness is 20 μm, the transparency is 90%, and the strength of the paper in water is about 15.1 ...

Embodiment 2

[0048] The basswood sawdust was mixed with a sodium hypochlorite solution with a concentration of 15%, the mass ratio of sawdust and sodium hypochlorite was 1:10, and the temperature was 50 ° C, and the reaction was carried out for 10 minutes. After the reaction, washed with water three times to remove the residual sodium hypochlorite. The slurry was filtered with a suction filtration device to remove a large amount of water, and then the product was placed in a press, and the pressure was maintained at 0.1 MPa for 0.1 hour to obtain transparent paper;

[0049] The transparent paper was placed in an aqueous sodium hydroxide solution with a concentration of 17% by mass and a temperature of 25° C. for 5 minutes, and then washed for 5 minutes to obtain a water-resistant transparent paper material. The fiber diameter of the water-resistant transparent paper is about 800 nm, the thickness of the paper is 20 μm, the transparency is 88%, and the strength of the paper in water is about...

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Abstract

The invention relates to the field of special paper manufacturing, in particular to a water-resistant transparent paper and its preparation method and application. The invention provides a cellulose water-resistant transparent paper with a fiber diameter of 5nm to 999nm. The fibers are entangled with each other without relying on the maintenance of hydrogen bonds, and still have high wet strength in water. And without modifying the molecular structure of cellulose, without introducing refractory hydrophobic additives, the impact on the crystal structure of cellulose is minimized, and the performance of the cellulose-based material itself is maintained, thus achieving the goal of reducing the diameter of the cellulose to 5nm. The control of cellulose fibers will not affect the transparency of the paper too much, and the transparency can be as high as 92%, which has achieved a good balance between water resistance and transparency of cellulose paper. The water-resistant paper prepared by the invention is easy to degrade, environmentally friendly, has both superior performance and broad application scenarios, and has good commercial prospects.

Description

technical field [0001] The invention relates to the field of special paper manufacturing, in particular to a water-resistant transparent paper and a preparation method and application thereof. Background technique [0002] Paper has bright application prospects due to its abundant sources, low price, biodegradability, light weight, excellent flexibility, controllable properties, and roll-to-roll production. In recent years, with the rapid development of various manufacturing technologies and the frequent intersection of multiple disciplines, many advanced paper-based materials have been continuously developed, making paper also begin to shine in the field of electronic devices that are in great demand. Devices such as circuit boards, field emission transistors, organic solar cells, and chemical and biological sensors have been fabricated. [0003] Transparent paper is a kind of special paper, which is widely used in labels, decoration, food packaging, construction, insulati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/18D21H17/06D21H17/64D21H17/67D21J5/00
CPCD21C3/18D21J5/00D21H17/675D21H17/06D21H17/64
Inventor 祝名伟黄大方吴佳扬陈延峰
Owner NANJING UNIV
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