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Water-resistant transparent paper as well as preparation method and application thereof

A technology of transparent paper and hydrophobic group, applied in papermaking, textile and papermaking, pulping with halogen compounds, etc., can solve the problems of lack of water resistance, increased process, lack of strength, etc., to achieve water resistance and transparency durability, excellent wear resistance, and the effect of a wide range of use scenarios

Active Publication Date: 2021-07-16
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 as well as preparation method and application thereof
  • Water-resistant transparent paper as well as preparation method and application thereof
  • Water-resistant transparent paper as well as preparation method and application thereof

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preparation example Construction

[0028] The present invention also provides a preparation method of the aforementioned cellulose water-resistant transparent paper, which includes the following steps: immersing the cellulose transparent paper in alkali solution for treatment, cleaning after the treatment, 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 immersing in alkaline solution, the cellulose paper is transformed into type II cellulose after being treated with alkaline solution. The molecular chains of type II cellulose are antiparallel. From the appearance, type II cellulose is helical. Specifically, when the cellulose paper is immersed in the lye, it swells first, so that the alkali penetrates into the crystal plane of the crystallization area, and forms a hydrated crystal compound with the cellulose molecules. Partially forms an amorphous structure; after cleaning and removing the lye...

Embodiment 1

[0045] Mix basswood sawdust with 15% sodium hypochlorite solution, the mass ratio of wood chips to sodium hypochlorite is 1:10, and react for 10 minutes at a temperature of 50°C. After the reaction, wash with water three times to remove residual sodium hypochlorite, take 5mL Slurry, and suction filtration with a suction filtration device to remove a large amount of water, then place the product in a press, under a pressure of 0.1MPa, hold the pressure for 0.1 hour to obtain transparent paper;

[0046] The transparent paper is 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 to obtain a water-resistant transparent paper material. The fiber diameter in the water-resistant transparent paper is about 600nm, the thickness of the paper is 20μm, the transparency is 90%, and the strength of the paper in water is about 15.1MPa.

Embodiment 2

[0048] Mix basswood sawdust with 15% sodium hypochlorite solution, the mass ratio of wood chips to sodium hypochlorite is 1:10, and react for 10 minutes at a temperature of 50°C. After the reaction, wash with water three times to remove residual sodium hypochlorite, take 5mL Slurry, and suction filtration with a suction filtration device to remove a large amount of water, then place the product in a press, under a pressure of 0.1MPa, hold the pressure 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. to react for 5 minutes, and then washed to obtain a water-resistant transparent paper material. The fiber diameter in the water-resistant transparent paper is about 800nm, the thickness of the paper is 20μm, the transparency is 88%, and the strength of the paper in water is about 15.5MPa.

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Abstract

The invention relates to the field of special paper manufacturing, in particular to water-resistant transparent paper as well as a preparation method and application thereof. The cellulose water-resistant transparent paper with the fiber diameter of 5-999 nm is provided, the fibers are mutually entangled and do not depend on the maintenance of hydrogen bonds, and the cellulose water-resistant transparent paper still has high wet strength in water. The cellulose molecular structure is not modified, a hydrophobic additive difficult to degrade is not introduced, the influence on a cellulose crystal structure is reduced as far as possible, and the performance of a cellulose-based material is maintained, so that control on cellulose fibers with the diameter as low as 5nm is realized, excessive influence on the transparency of paper is avoided, the transparency can reach 92%, and the balance of water resistance and transparency of the cellulose paper is well realized. The water-resistant paper prepared by the invention is easy to degrade and environment-friendly, has excellent performance and wide application scene, and has good commercial prospect.

Description

technical field [0001] The invention relates to the field of special paper manufacturing, in particular to a water-resistant transparent paper and its preparation method and application. Background technique [0002] Paper has bright application prospects due to its many advantages such as 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 materials have been continuously developed, making paper also start to shine in the field of electronic devices that are in high demand. Various paper-based electronic devices 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 labeling...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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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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