A kind of preparation method of high temperature aging resistant natural fiber paper

A technology of natural fiber and high temperature resistance, which is applied in the direction of natural cellulose pulp/paper, cellulose pulp post-treatment, fiber raw material treatment, etc. It can solve the problems of mechanical strength decline and difficulty in meeting market demand, so as to improve mechanical strength and increase Physical entanglement point, the effect of improving the high temperature resistance grade

Active Publication Date: 2019-04-23
HEFEI LONGFA PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Paper produced from natural fibers has good mechanical strength, oil resistance and weather resistance, but when the paper is in a high temperature environment, the cellulose molecular chain will gradually break and degrade, so that the mechanical strength of the paper will drop sharply. In the 1950s, it was adopted abroad. The applicable temperature of acrylonitrile-modified natural fiber treated with cyanide can be increased by 20°C; Compounds modify natural fibers to increase the nitrogen content in the fibers, so that the natural fibers are covered with a layer of nitrogen-containing heat-insulating clothing, thereby preventing cellulose from oxidative degradation; after the 1990s, various synthetic fiber papers have been developed successively in various countries. The ability has been further improved, but under high temperature conditions, the mechanical strength will still decrease significantly, which is difficult to meet the market demand. Therefore, further research is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A method for preparing high temperature aging-resistant natural fiber paper, comprising the following contents: making a mixed slurry from natural softwood pulp and hardwood pulp, concentrating the slurry to a water content of 3%, adding 5% of its weight Nucleotide solution with a mass concentration of 4%, stirred evenly, soaked at 40-45°C for 1.5-2 hours, and then refined with a refining unit to make the beating degree 28°SR; the ground Concentrate the slurry again to a water content of 0.8-1%, put the slurry in a sealed bag, and balance the moisture for 24 hours at a temperature of 10°C for later use; Pressing and drying, when drying to a water content of 33%, impregnating the surface with a binding liquid containing six-membered heterocyclic compounds, drying and hot pressing to obtain a finished product.

[0014] Wherein, the weight ratio of the natural color softwood pulp and hardwood pulp is 2-4:1; the refining unit includes a deflagging machine and two refining m...

Embodiment 2

[0019] A method for preparing natural fiber paper resistant to high temperature and aging, comprising the following contents: preparing a mixed slurry from uncolored softwood pulp and hardwood pulp, concentrating the slurry to a water content of 3-4%, adding an amount equivalent to its weight 4% nucleotide solution with a mass concentration of 5%, stir evenly, soak for 1.5-2 hours at 40-45°C, and then use a refining unit to refine the pulp so that the beating degree is 26°SR; Concentrate the good slurry again to a water content of 0.8-1%, put the slurry in a sealed bag, and balance the moisture for 20 hours at a temperature of 12°C, and set aside; after dispersing the products, papermaking is carried out in sequence , rolling and drying. When drying to a moisture content of 35%, the surface is impregnated with a binding liquid containing a six-membered heterocyclic compound, and the finished product is obtained after drying and hot pressing.

[0020] The rest of the content is...

Embodiment 3

[0022] A method for preparing natural fiber paper resistant to high temperature and aging, comprising the following contents: preparing a mixed slurry from uncolored softwood pulp and hardwood pulp, concentrating the slurry to a water content of 3-4%, adding an amount equivalent to its weight 5% nucleotide solution with a mass concentration of 2%, stir evenly, soak for 1.5-2 hours at 40-45°C, and then use a refining unit to refine the pulp so that the beating degree is 32°SR; Concentrate the good slurry again to a water content of 0.8-1%, put the slurry in a sealed bag, and balance the moisture for 28 hours at a temperature of 10°C for later use; after dispersing the obtained products, papermaking is carried out in sequence , Rolling and drying. When drying to a moisture content of 30%, the surface is impregnated with a binding liquid containing a six-membered heterocyclic compound, and the finished product is obtained after drying and hot pressing.

[0023] The rest of the co...

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Abstract

The invention belongs to the field of technologies for processing packaging paper, and particularly relates to a method for preparing high-temperature-aging-resistant natural fiber paper. The method includes preparing mixed pulp from natural color needle leaf wood pulp and broadleaf wood pulp, concentrating the pulp, adding nucleotide solution into the mixed pulp and carrying out soaking and grinding to obtain pulp; concentrating the ground pulp, placing the pulp into a sealing bag and balancing moisture under the low-temperature conditions; sequentially carrying out papermaking, rolling and drying, impregnating adhesive liquid with six-member heterocyclic compounds on the surfaces of paper, drying the paper and carrying out hot-press to obtain the finished high-temperature-aging-resistant natural fiber paper. Compared with the prior art, the method has the advantages that the mechanical strength of the paper can be improved, then the adhesive liquid with the six-member heterocyclic compounds is impregnated on the surfaces of the paper by means of impregnation, the paper is dried and is subjected to hot-press, accordingly, chemical bonds between fibers are connected with one another to form fiber network structures, physical entanglement points between the fibers are increased, the fibers are promoted to be chemically bonded with the adhesive liquid, the strength of the high-temperature-aging-resistant natural fiber paper can be guaranteed, the high-temperature-resistant grade of the high-temperature-aging-resistant natural fiber paper can be upgraded, and the service range of the high-temperature-aging-resistant natural fiber paper can be expanded.

Description

technical field [0001] The invention belongs to the technical field of packaging paper processing, and in particular relates to a preparation method of high-temperature aging-resistant natural fiber paper. Background technique [0002] Paper produced from natural fibers has good mechanical strength, oil resistance and weather resistance, but when the paper is in a high temperature environment, the cellulose molecular chain will gradually break and degrade, so that the mechanical strength of the paper will drop sharply. In the 1950s, it was adopted abroad. The applicable temperature of acrylonitrile-modified natural fiber treated with cyanide can be increased by 20°C; Compounds modify natural fibers to increase the nitrogen content in the fibers, so that the natural fibers are covered with a layer of nitrogen-containing heat-insulating clothing, thereby preventing cellulose from oxidative degradation; after the 1990s, various synthetic fiber papers have been developed success...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/00D21H11/00D21H19/24D21H19/34D21H19/14
CPCD21C9/005D21H11/00D21H19/14D21H19/24D21H19/34
Inventor 林悦敏
Owner HEFEI LONGFA PACKING CO LTD
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